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02-13-2019, 04:06 PM
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#1
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Member
Join Date: Dec 2016
Posts: 30
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All Tail lights come on when shifting to Reverse
2016 MBS 2401R. Anyone know why all tail lights would come on when selecting reverse? Just started happening. Also when turning head lamps or parking lights on the Backup white lights come on. Anyone have access or know where to go to get wiring diagrams for the FR Chassis part or the MBS connectors to the rear cabin area? MB blames, FR and FR says its MB. At a tug of war loss. I need wiring for tail lamp assy. It's not the Curt controller.
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02-13-2019, 04:22 PM
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#2
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Member
Join Date: Dec 2016
Posts: 30
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Wiring diagrams for 2401R Tail lights
Anyone help on wiring diagram for 2016 MBS Forester 2401R wiring diagrams for the tail light assy and backup lights. MB and FR finger pointing. I have AC and DC cabin wiring diagrams but nothing for exterior lighting.
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02-13-2019, 04:53 PM
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#3
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Senior Member
Join Date: Mar 2012
Posts: 799
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I would take apart the 7 way outlet and look for stray wires or corrosion.
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DYNAMAX 2016 FORCE HD
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02-13-2019, 05:12 PM
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#4
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,501
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Quote:
Originally Posted by houstonstroker
I would take apart the 7 way outlet and look for stray wires or corrosion.
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How would that help track down tail light issues in a motor home
__________________
2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 78; Booked for 2024 = 69
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02-13-2019, 05:16 PM
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#5
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Senior Member
Join Date: Mar 2012
Posts: 799
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Quote:
Originally Posted by Mr. Dan
How would that help track down tail light issues in a motor home
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My motorhome has a 7 way outlet at the rear. I have seen where a single strand from one wire, lets say reverse, is now touching the tail light wire. Put the shifter in reverse and now you have reverse lights and tail lights. Bad grounds do some crazy stuff also.
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DYNAMAX 2016 FORCE HD
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02-13-2019, 05:17 PM
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#6
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,501
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Quote:
Originally Posted by houstonstroker
My motorhome has a 7 way outlet at the rear. I have seen where a single strand from one wire, lets say reverse, is now touching the tail light wire. Put the shifter in reverse and now you have reverse lights and tail lights. Bad grounds do some crazy stuff also.
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OK, got it. Just asking.
__________________
2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 78; Booked for 2024 = 69
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02-13-2019, 05:46 PM
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#7
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Member
Join Date: Dec 2016
Posts: 30
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Quote:
Originally Posted by houstonstroker
I would take apart the 7 way outlet and look for stray wires or corrosion.
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Yes sir took the entire assy apart no shorts and no frayed wires or corrosion, Thanks
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02-13-2019, 05:47 PM
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#8
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Senior Member
Join Date: Jun 2011
Location: Big brown desert
Posts: 3,003
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Also, try pulling the bulbs out of reverse socket and see if it still lights up tail lights. Seen crazy bulb stuff too
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2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away
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02-13-2019, 06:29 PM
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#9
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Senior Member
Join Date: May 2014
Posts: 901
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There have been all kinds of issues with the taillights. It's important to note that the setup on these Sprinter motorhomes is pretty much different from any other vehicle. In particular, the taillights (and marker lights and backup lights and brake lights) are not driven directly by the Sprinter chassis. FR has installed a taillight control interface between the chassis and all those lights and the trailer plug lights as well. That's why a problem in the 7 way can be reflected all over the place.
Anyway, there have been problems with the controller module such that it was subject to recall a few years ago...and folks have still had problems with the newer controller. So it might be related to the controller. Or it might not. But, after the 7-way, that's probably where I'd start to look.
Dave
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2015 Solera 24R
2014 Mercedes Chassis
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02-13-2019, 10:23 PM
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#10
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Member
Join Date: Dec 2016
Posts: 30
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Quote:
Originally Posted by DaveJordan
There have been all kinds of issues with the taillights. It's important to note that the setup on these Sprinter motorhomes is pretty much different from any other vehicle. In particular, the taillights (and marker lights and backup lights and brake lights) are not driven directly by the Sprinter chassis. FR has installed a taillight control interface between the chassis and all those lights and the trailer plug lights as well. That's why a problem in the 7 way can be reflected all over the place.
Anyway, there have been problems with the controller module such that it was subject to recall a few years ago...and folks have still had problems with the newer controller. So it might be related to the controller. Or it might not. But, after the 7-way, that's probably where I'd start to look.
Dave
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Thx, I have replaced the controller and same issue. I’m a 20 AE/AT aircraft electrician. I’m taking it to Mercedes dealer for them to check the chassis wiring and I’ll go from there.
Appreciate the help.
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02-14-2019, 03:57 PM
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#11
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Senior Member
Join Date: Jan 2018
Location: Raleigh, NC
Posts: 9,458
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Crazy bulb stuff
Quote:
Originally Posted by HONDAMAN174
Also, try pulling the bulbs out of reverse socket and see if it still lights up tail lights. Seen crazy bulb stuff too
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The "crazy bulb stuff" happens when a dual-filament lamp fails such that one filament breaks and drops down, shorting to the other. Then, for example, a left turn signal could cause all four parking lights to flash, or braking could cause the bright filament of both front lights to light.
The OP's problem includes backup lights. Since backup lights are single-filament lamps, they would not be subject to this failure mode.
Larry
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02-14-2019, 05:07 PM
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#12
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Senior Member
Join Date: Jun 2017
Location: Escondido, CA
Posts: 817
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Quote:
Originally Posted by RVReggie
Thx, I have replaced the controller and same issue. I’m a 20 AE/AT aircraft electrician. I’m taking it to Mercedes dealer for them to check the chassis wiring and I’ll go from there.
Appreciate the help.
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I too was an AT on F-4/F-14/F-18 Aircraft for 24 years so I know it is not something easy if you can't find it. It gets more complicated because the RV Builder taps into the Sprinter wiring and does not provide any diagrams of what they did. I figured out a lot of it myself and fixed numerous chafing wires with heat-shrink, spiral wrap, teflon tape and just a lot of tie-straps.
First time I looked under the MH I saw the the Curt Trailer Junction Box just hanging by the wiring, I thought this is a problem waiting to happen. I cleaned all the wiring up, sealed it, put it in a water proof bag and tied it to the frame. No problems in several years.
Anyone owning a Motorhome should crawl under ever inch of it and look for potential chafing and water intrusion problems and tie it up real good.
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2016 Dynamax Isata 3 24FW
2016 Jeep Willys JK
Yellow Lab Buddy Biscuit Eater
USN-RET/DOD-RET
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02-14-2019, 06:30 PM
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#13
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Member
Join Date: Oct 2016
Posts: 94
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Quote:
Originally Posted by mlmay12
First time I looked under the MH I saw the the Curt Trailer Junction Box just hanging by the wiring, I thought this is a problem waiting to happen. I cleaned all the wiring up, sealed it, put it in a water proof bag and tied it to the frame. No problems in several years.
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After the recall was addressed on my rig I had strange issues with the lights as well. Unplugged the junction box connecter, dried it out and put it back together, sealed it and voila, no more issues.
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2016 Sunseeker 2400WM Sprinter 3500 Diesel
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02-14-2019, 06:39 PM
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#14
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Member
Join Date: Dec 2016
Posts: 30
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They tail lights are a modular type with LED assy’s.
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02-14-2019, 06:40 PM
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#15
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Member
Join Date: Dec 2016
Posts: 30
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Quote:
Originally Posted by mlmay12
I too was an AT on F-4/F-14/F-18 Aircraft for 24 years so I know it is not something easy if you can't find it. It gets more complicated because the RV Builder taps into the Sprinter wiring and does not provide any diagrams of what they did. I figured out a lot of it myself and fixed numerous chafing wires with heat-shrink, spiral wrap, teflon tape and just a lot of tie-straps.
First time I looked under the MH I saw the the Curt Trailer Junction Box just hanging by the wiring, I thought this is a problem waiting to happen. I cleaned all the wiring up, sealed it, put it in a water proof bag and tied it to the frame. No problems in several years.
Anyone owning a Motorhome should crawl under ever inch of it and look for potential chafing and water intrusion problems and tie it up real good.
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Yep, after Mercedes confirms it’s not forward of the disconnect, that’s what I’m going to do! Crawl and document! Thx.
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02-14-2019, 07:06 PM
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#16
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Senior Member
Join Date: Jun 2011
Location: Big brown desert
Posts: 3,003
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Agreed Larry. We probably have seen bulbs crammed into incorrect sockets too from factory. But as another pointed out, sounds like they are led panels.
Hell, I’ve seen a dual bulb shoved into a single socket and damn thing set a check engine light for a trans shift issue. Bad thing is Honda was aware of this problem.
__________________
2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away
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02-14-2019, 07:42 PM
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#17
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Senior Member
Join Date: Jun 2015
Posts: 639
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Here is a link to a mod I did to protect the Curt taillight controller. The recall by FR replaced the Curt with a Hopkins and added an inline fuse, but based on reports on this forum, the Hopkins controller fails too. Unfortunately, the recall does not address the issue that some of us think is the root cause - mounting the controller outside of the vehicle on the rear bumper in line with tire spray.
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