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Old 06-10-2014, 02:23 PM   #1
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No charging from the tow vehicle...

We bought a new 5th wheel last year. Cougar High Country 246RL. It works fine EXCEPT that it appears I'm not charging the trailer battery from the truck. Our PREVIOUS 5th wheel worked fine, charging when it was hooked up, so I PRESUME the 7 wire connector is working correctly...

Tail lights, brake lights, 4-ways, trailer brakes, all work fine on the new trailer, so again I'm PRESUMING (risky?) the wiring should be the same.

I checked the plug at the truck, and I have 12V there, so I presume the fuse is good and the wire is good.

I checked the fuse panel in the trailer, but I don't know if there IS a fuse for the line coming with 12V from the truck. All the 12V fuses are 15A except for 2, 40 amp fuses. One of those causes the exhaust fan to slow down when I remove it, so I presume that's NOT the one from the truck (truck isn't attached at the moment)...

Is there normally a fuse on the line coming from the truck? If so, is it normally in the fuse panel (one of the 40A?). Neither of the 40 amp fuses are blown, so if there's a problem I'm guessing it's somewhere else?

Thoughts?
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Old 06-10-2014, 06:43 PM   #2
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How do you know it's not charging?

Do this, unplug the battery negative cable, unplug the trailer from shore power. You should have NO 12V anything. Now, only hook up the 7way trailer light connector to the truck. You should have lights and such if all is good.
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Old 06-15-2014, 03:01 PM   #3
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I haven't tested battery voltage in the trailer (ran out of time before leaving), but I noticed a couple weeks ago after a day of towing with the ceiling exhaust fans on, a couple lights, and so on, my jacks wouldn't even lift the trailer when I stopped. When I plugged into shore power I got a BIG increase. There's always a slight increase on shore power, but nothing like this was.

I also checked the battery level before I plugged in the truck after unplugging from shore power, and it showed full but not charging. Plugged in the truck and started it, and still didn't show charging.

I'll do more testing.

I"ll try testing by unplugging the trailer battery negative cable then plugging in the truck to see what happens....
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Old 06-15-2014, 04:44 PM   #4
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If you check the charge pin (12+) on the trailer, it should show voltage from the trailer battery. If not, you'll need to trace that line from connector to the fuse panel and battery and find the fuse.
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Old 06-15-2014, 08:15 PM   #5
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Why not check terminal number four for power with a test light. Check the truck to ground (probably need to have the truck running) and then check the plug to ground on the trailer. If the light does not light for one then you know which direction to check. Here is a drawing of the wiring to help with your diagnosis:
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Old 06-16-2014, 12:11 PM   #6
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What r u towing it with? I know that Ford F150's require you to install a relay under the hood in the relay fuse box. Had two F150's (08-10) and both relays were in the glove box inside plastic bags containing various other uninstalled items.
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Old 06-16-2014, 11:18 PM   #7
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What makes you think your batteries aren't charging. Have you checked on the condition of your batteries. Maybe the batteries are problematic
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Old 06-17-2014, 04:38 PM   #8
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I checked the truck, and there's power where there should be... I didn't think of checking the trailer plug for power on the right pin (doh)...

The truck is a 2005 3/4 ton Silverado Duramax - same truck we towed the previous 5th wheel with, that always showed charging on the monitor panel when hooked to the truck.

I need to get out and do some testing and fiddling, but my wife comes up with projects faster than I can get them done.

The battery in the trailer charges fine on shore power, and runs all the equipment fine. I'm going from the monitor panel and my experience after a day of towing to say the battery isn't charging when it's not on shore power. As I said, I need to get out and do some testing. Along with the other 17 things I'm supposed to be doing!
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Old 06-17-2014, 09:03 PM   #9
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The monitor panel shows "relative" voltages and "charging" is just a range so doesn't really tell much.
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Old 06-17-2014, 09:15 PM   #10
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I guess if it were me, I would hook the truck up (just the power cord) and use a digital multi-meter and see what the voltage is at the batteries both with the truck running and not running. If the meter shows 13.5+ volts running and less not running then things are good. If they are the same, trace out the wiring and check the auto-reset circuit breaker.
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Old 06-19-2014, 12:08 PM   #11
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Don't want to hi-jack the thread but along the same lines, I have a 2005 Duramax GMC and I am not getting any voltage on the charge line. I have checked fuses on the side dash panel as well as under the hood. Can find none bad. Does anyone know where the charge line comes from either under the dash or hood and is there a hidden fuse?

Thanks.....burfurd
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Old 06-19-2014, 07:16 PM   #12
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Do you have a 40A fuse in position number one in your underhood fusebox?
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Old 06-20-2014, 11:17 AM   #13
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On my 07 Chevy, which included pre-wire for 5th wheel, there was a wire at the driver side battery that had to be energized.
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Old 06-22-2014, 07:50 AM   #14
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Quote:
Originally Posted by Scottybdivin View Post
On my 07 Chevy, which included pre-wire for 5th wheel, there was a wire at the driver side battery that had to be energized.
My 2011 has the same wire on the driver side battery, and is tagged for 12 volt power on plug.
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