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Derick's avatar
Derick
Explorer
Aug 06, 2018

Tow vehicle isn't charging trailer...weird one...

Ok, this is very strange. Originally, my tow vehicle was a 2006 Toyota Sequoia. I had decided it was a bit anemic for pulling my 23" toy hauler. I have since sold it, and purchased a 3/4 ton suburban ...
theoldwizard1's avatar
theoldwizard1
Explorer II
Aug 07, 2018
Derick wrote:

I get 12V at the 2 oclock pole on the 7 pin connector on the truck. Also, I get 12V at the corresponding pole on the trailer side, presumably from the camper battery back feeding it.

One more step !

Turn off all 12V load in the trailer. Disconnect the trailer battery and see if what voltage you are get AT THE BATTERY CONNECTION With the engine running a high idle. I will bet it is less than 13.5V.

Read this on DC-DC battery charging.

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