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Old 05-20-2018, 10:06 AM   #1
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Need Help with Battery Boost Switch

So decided to swap out the "ABS" switch on the dash that can use the house batteries to start the engine if ever your chassis batteries are dead for an actual "Battery Boost" switch. They are both momentary switches.

Need some help figuring out what the ABS switch does. I used my tester and ran current through all the connectors both at rest and pressed. None completed or broke a circuit.

I labeled some pictures to see if anyone could help figure this out. Let me know if I have everything labeled correctly.
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Old 05-20-2018, 11:21 AM   #2
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shultz01

Great info but more testing is needed.
1. Do you have a remote relay that actually closes when switch is pushed in the boost mode?
Usually it looks like an old starter relay and should be two of them.
Here is a generic picture of mine in my motorhome.

Hope this help you a bit.
Good Luck.
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Old 05-20-2018, 11:38 AM   #3
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Thanks Iggy. I think I figured it out. I decided to test the "ABS" switch while plugged in versus unplugged.

White is ground and not effected by the switch. Green and yellow are closed when the switch is not pressed and open when pressed. Make sense?
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Old 05-20-2018, 11:52 AM   #4
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interesting....but 'why' does your unit have such an 'ABS' switch in the first place?
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Old 05-20-2018, 12:10 PM   #5
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It's not actually for the brakes (even though that's what the symbol on it would have you think). It is used for battery boost because it is a momentary switch that does what it needs to do...open the circuit when pressed to have the coach batteries start the engine.
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Old 05-20-2018, 12:16 PM   #6
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Thanks Iggy. I think I figured it out. I decided to test the "ABS" switch while plugged in versus unplugged.

White is ground and not effected by the switch. Green and yellow are closed when the switch is not pressed and open when pressed. Make sense?
Just looks like the Batt Boost switch doesn't have a dedicated ground. The other prong looks like it is used for the opposite action...open when not pressed and closed when pressed.

So not sure what to do with the white ground wire.
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Old 05-20-2018, 12:35 PM   #7
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It's not actually for the brakes (even though that's what the symbol on it would have you think). It is used for battery boost because it is a momentary switch that does what it needs to do...open the circuit when pressed to have the coach batteries start the engine.
Hummm I don't have that ABS, I have this
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Old 05-20-2018, 12:59 PM   #8
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Hummm I don't have that ABS, I have this
Yep. They recently started using a switch that does the same thing but is labeled correctly.
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Old 05-20-2018, 02:55 PM   #9
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The old one was labeled correctly too. Auxiliary Battery Start .
I have no idea on the wiring. I’ll have to ask Monday
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Old 05-21-2018, 08:26 AM   #10
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Thanks Brian. I also have this switch as well. Please let me know about the wiring. Thanks. Click image for larger version

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Old 05-21-2018, 09:09 AM   #11
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A label might have been simpler
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Old 05-21-2018, 09:15 AM   #12
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Why would anyone want to replace a functioning switch with a switch that does the exact same thing? This thread makes no sense but then, who am I.
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Old 05-21-2018, 09:29 AM   #13
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Unfortunately I understand it in my sick way. I replaced perfectly good ball bearing drawer guides on a brand new desk because I wanted soft close. I am itching to tear some fixed shelves apart (always looking for new ways to use an oscillating tool) that don't fit some DVD bins we have, but my wife was the voice of reason..."why not just buy new bins that fit". lol. I guess that's one way.
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Old 05-21-2018, 11:43 AM   #14
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Try this.
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Old 05-21-2018, 11:55 AM   #15
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Why would anyone want to replace a functioning switch with a switch that does the exact same thing? This thread makes no sense but then, who am I.
Not that I feel compelled to respond to negativity but...
It's a perfectionist thing, you may not understand. I just can't have an Auxiliary Braking System switch being used for Battery Boost. Plus it stays lit 24/7/365 which I'd rather not be the case.
Hopefully this makes sense now. I mean I'd hate to aggravate you any further with my post. Maybe I should send all my posts to you for approval before submitting them. Unbelievable.
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Old 05-21-2018, 11:55 AM   #16
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Try this.
Thanks Brian. :-) I'll give it a shot. Much appreciated.
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Old 05-21-2018, 12:18 PM   #17
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Uh hem...you mean "Alternative Battery Start" "Auxillary Battery Start". I can't help it that the automotive industry stole our acronym.

Next you'll claim that "New Appliance Switch Access" means something else. sheesh.
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Old 05-21-2018, 12:27 PM   #18
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cap and stow the light wires. You're gonna do that anyway with the new switch. I'm outa here.
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Old 05-21-2018, 01:32 PM   #19
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Try this.


Hi Brian. Can you confirm that 2 and 4 are open and toggling the switch closes them?
Thanks.
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Old 05-21-2018, 01:44 PM   #20
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EE is gone, but according to the schematic, the yellow is radio memory (constant hot to the chassis battery) and the lit green is the Emergency start switch...that is what would force the solenoid closed if that received power. So yes, they would be closed until that switch engages them.
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