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Old 08-04-2020, 03:39 AM   #1
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Trailer not charging when on the road

I have a 2020 f 150 and a 2019 2506 rockwood mini light. With my 2014 f 150 I had to install a relay that ford left in the glove compartment and the charging work fine. The 2020 f 150 appears to have all relays and fuses in place. I had replaced my 12 volt batteries with two six volt and installed a inverter, but I can't see how that would affect the charging. All works fine when on shore power. I realize im not going to get a full charge, but at least hold what charge I have. Just not working...
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Old 08-04-2020, 04:32 AM   #2
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I have a 2020 f 150 and a 2019 2506 rockwood mini light. With my 2014 f 150 I had to install a relay that ford left in the glove compartment and the charging work fine. The 2020 f 150 appears to have all relays and fuses in place. I had replaced my 12 volt batteries with two six volt and installed a inverter, but I can't see how that would affect the charging. All works fine when on shore power. I realize im not going to get a full charge, but at least hold what charge I have. Just not working...
Have you used a multimeter to check the chargeing wire in your 7-pin connector and the converter's charge output?
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Old 08-04-2020, 04:43 AM   #3
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Test 7 pin

Yes I have 12v when truck is on. I have a inverter/charger installed. I removed the old converter. Im starting to think that something is not wired right on the 12v side.
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Old 08-04-2020, 05:25 AM   #4
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Yes I have 12v when truck is on. I have a inverter/charger installed. I removed the old converter. Im starting to think that something is not wired right on the 12v side.
How much 12v do you get from the truck? Most tow vehicles only provide a trickle charge at best.
Have you tested how much charge is getting to the batteries, when plugged into shore power?
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Old 08-04-2020, 05:29 AM   #5
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I don't have any problem when connected to shore power. Inverter goes into charge mode and charges the batteries fine.
12v battery wires run from battery to trailer lift to slide out. I discounted it going to distribution panel in trailer. I believe, but I have to check to see if it also run to truck harness. If not that could be the problem. I don't see that it has anything to do with the inverter. The inverter wire in from shore and out to distribution box to power 12v side. I have a junction box for ac when hook up to shore power. Make sense?
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Old 08-04-2020, 07:32 AM   #6
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At this point you need to get a DC amp meter (preferably a clamp-on) and see how much current is flowing to the battery if any.

You say you have 12+ volts from the truck. Do you know the exact voltage from the truck when hooked to the RV and when not hooked up?
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Old 08-04-2020, 08:07 AM   #7
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At this point you need to get a DC amp meter (preferably a clamp-on) and see how much current is flowing to the battery if any.

You say you have 12+ volts from the truck. Do you know the exact voltage from the truck when hooked to the RV and when not hooked up?
X2
Measure battery voltage in your R/V with the truck connected and running and then with the truck off or disconnected.
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Old 08-04-2020, 08:10 AM   #8
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How much 12v do you get from the truck? Most tow vehicles only provide a trickle charge at best.
Have you tested how much charge is getting to the batteries, when plugged into shore power?

This has been an issue with late model ford trucks. It's only a 16ga wire supplying your charging voltage, there are work arounds posted on the F150 forum sites. As asked above what voltage do you measure at the battery when connected to the truck. Don't forget to leave the key fob in the running truck and close the door otherwise the truck doesn't send a charging voltage.
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Old 08-04-2020, 08:33 AM   #9
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I’ll check it when I get home. I’m assuming I have to disconnect from batteries.
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Old 08-04-2020, 08:36 AM   #10
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This has been an issue with late model ford trucks. It's only a 16ga wire supplying your charging voltage, there are work arounds posted on the F150 forum sites. As asked above what voltage do you measure at the battery when connected to the truck. Don't forget to leave the key fob in the running truck and close the door otherwise the truck doesn't send a charging voltage.
X2 and on mine... if I don't select a trailer on the "Towing" tab in the dash display, it doesn't send a charging voltage either.
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Old 08-04-2020, 09:26 AM   #11
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Iíll check it when I get home. Iím assuming I have to disconnect from batteries.

No. First measure the voltage of the batteries as they rest on the trailer, then connect the truck, and follow all the steps above to get a charging voltage, then go back and measure across the batteries. Batteries alone fully charged should be 12.6V Charging voltage should be 13.6+ Also see what the voltage is across the truck battery when running, your charging voltage will never be higher than what the truck's voltage regulator is putting out.
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Old 08-04-2020, 09:39 AM   #12
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Might be overkill in your situation, but I have a 2019 f150 and 2506, and ran a 4 gauge fused wire to a plug in the back, and use a victron 12/30 dc to dc charger. I wanted a backup because I am trying to avoid a generator.
I went with the 30 amp because my truck came with the on board inverter, and thus the bigger alternator. There are smaller dc to dc chargers available also if you are worried about hitting the juice too hard. But it will produce a steady 35 amp charge in my case, which should be well within the capability of the alternator. It will draw somewhere around 43 or so amps from the truck to do that.
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Old 08-04-2020, 10:15 AM   #13
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X2
Measure battery voltage in your R/V with the truck connected and running and then with the truck off or disconnected.
This^^^ plus it might be a good idea to check the plug on the trailer connector wire for the presence of 12v power before anything else. This will at least verify that the charge wire in the plug is connected to the battery on the trailer. If not, it needs to be fixed first.

It's been verified that 12v is present at the proper pin in the receptacle on the truck so now check to see if it has a place to go in the plug.
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Old 08-04-2020, 10:23 AM   #14
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Turn on parking lights. Check voltage at battery with positive cable off of battery. Turn lights of and on ,watch for voltage change on volt meter.
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Old 08-04-2020, 10:24 AM   #15
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Might be overkill in your situation, but I have a 2019 f150 and 2506, and ran a 4 gauge fused wire to a plug in the back, and use a victron 12/30 dc to dc charger. I wanted a backup because I am trying to avoid a generator.
I went with the 30 amp because my truck came with the on board inverter, and thus the bigger alternator. There are smaller dc to dc chargers available also if you are worried about hitting the juice too hard. But it will produce a steady 35 amp charge in my case, which should be well within the capability of the alternator. It will draw somewhere around 43 or so amps from the truck to do that.

Through the factory trailer wiring harness in your truck? Or have you upgraded.

On my truck (I realize different brand) I installed a Renogy 20 amp DC-DC charger that draws 27-29 amp through the factory wiring. Unfortunately I only got 13-15 amp at the batteries. I installed a separate #8 awg duplex wire from truck battery to hitch and use andersen connectors to connect to trailer. Now I get a full 20 amp charge.
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Old 08-04-2020, 11:51 AM   #16
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This^^^ plus it might be a good idea to check the plug on the trailer connector wire for the presence of 12v power before anything else. This will at least verify that the charge wire in the plug is connected to the battery on the trailer. If not, it needs to be fixed first.

It's been verified that 12v is present at the proper pin in the receptacle on the truck so now check to see if it has a place to go in the plug.

This is good troubleshooting advise if you didn't have a late model Ford. With Ford unless the truck "sees" the trailers running light load it will not send voltage to the charging circuit. Plus as noted in a couple of other posts above you need to acknowledge the trailer connected, leave the key fob in the truck and close the door. Don't ask how I now know these things
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Old 08-04-2020, 01:02 PM   #17
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Originally Posted by letup27 View Post
I have a 2020 f 150 and a 2019 2506 rockwood mini light. With my 2014 f 150 I had to install a relay that ford left in the glove compartment and the charging work fine. The 2020 f 150 appears to have all relays and fuses in place. I had replaced my 12 volt batteries with two six volt and installed a inverter, but I can't see how that would affect the charging. All works fine when on shore power. I realize im not going to get a full charge, but at least hold what charge I have. Just not working...
ooo
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Old 08-04-2020, 01:08 PM   #18
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If you open your breaker panel and there is a flashing light / power cord plug in to shore power,,, pressing it will boost power to batteries for a quick charge . Service rep. said do in emergency only . not recomended but there for quick charges . only stays in this mode for a brief time. Dont know model # of my panel . its in a puma unleashed toy hauler. 2016.
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Old 08-04-2020, 02:42 PM   #19
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So.. just gonna throw this out there.

I was getting frustrated that my camper wasn't charging when going down the road. Turns out that my battery disconnect was on.. it worked just fine when I was on shore power through (because I wasn't using the battery). In my case, the switch was in the "on" position.. it was just the cheap Amazon switch that wasn't functioning properly. After flipping it back and forth several times it started working (I assume it's got corrosion inside that was causing the issue).

Yeah, I felt pretty dumb after I'd spent an hour looking at everything, testing the truck, the fuses, etc.. LOL.
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Old 08-04-2020, 02:46 PM   #20
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Yeah!!! back on the road again.
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