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Old 10-15-2016, 01:01 AM   #11
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Here is a basic diagram how you get battery power from the truck to the Battery in the trailer to charge it while on the road towing.

The only other thing we have to make sure is that the Ground wire from the truck is hooked up to the ground wire on the trailer frame. Wire #1
It is possible you don't have a ground wire but using the actual hitch to the truck frame as a ground.
Just thinking out loud.
Let us know what else you find.
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Old 10-15-2016, 11:43 AM   #12
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Originally Posted by jschmidt View Post
I have 12 volts at the plug on my truck when I checked it with my meter and the battery terminals are tapped so the won't short out if they hit the frame i plugged the trailer into my truck and checked for voltage where the battery cables are mounted underneath the front of the camper and have 0 volts with my meter when hooked up to positive and negative cables. I am waiting on the box to put a battery in to come in
Did you check for voltage at your battery terminals with the key on or off in the truck. The fuse & relay I mentioned earlier disconnect the battery/terminals in the trailer when the key is turned off. This prevents the trailer from running your trucks battery down when the truck is not running. The relay goes in position #9 & the 30amp fuse goes in position #21 in your fuse box. Check them out.
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Old 10-15-2016, 11:57 AM   #13
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Did you check for voltage at your battery terminals with the key on or off in the truck. The fuse & relay I mentioned earlier disconnect the battery/terminals in the trailer when the key is turned off. This prevents the trailer from running your trucks battery down when the truck is not running. The relay goes in position #9 & the 30amp fuse goes in position #21 in your fuse box. Check them out.
Good call. Worth checking.
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Old 10-15-2016, 03:26 PM   #14
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How to energize pin #4?

I have a similar issue. I have never had power going from the harness to the trailer, only tail and running lights. I just went out ( 10 minutes ago) and tested pin 4, no voltage. Do I need to go to an electrical shop to get additional wiring to power pin4? This is 2006 Isuzu Ascender TV with factory harness for towing. This would be valuable to allow me to run Dometic fridge while we are driving to keep it cool between home and campground.
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Old 10-15-2016, 06:57 PM   #15
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The measurements I took were with the truck running
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Old 10-15-2016, 07:10 PM   #16
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Originally Posted by Fuzzy53 View Post
I have a similar issue. I have never had power going from the harness to the trailer, only tail and running lights. I just went out ( 10 minutes ago) and tested pin 4, no voltage. Do I need to go to an electrical shop to get additional wiring to power pin4? This is 2006 Isuzu Ascender TV with factory harness for towing. This would be valuable to allow me to run Dometic fridge while we are driving to keep it cool between home and campground.
I would first check the fuse block (likely under the hood) to see if there is a fuse and make sure it is good.
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Old 10-15-2016, 11:20 PM   #17
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Originally Posted by jschmidt View Post
The measurements I took were with the truck running
What terminal are checking? Have you checked for the fuse & relay?
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Old 10-15-2016, 11:47 PM   #18
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Originally Posted by Fuzzy53 View Post
I have a similar issue. I have never had power going from the harness to the trailer, only tail and running lights. I just went out ( 10 minutes ago) and tested pin 4, no voltage. Do I need to go to an electrical shop to get additional wiring to power pin4? This is 2006 Isuzu Ascender TV with factory harness for towing. This would be valuable to allow me to run Dometic fridge while we are driving to keep it cool between home and campground.
You will need to read your owners manual. MOST trucks, especially older ones, do not come with the fuses/relays that are required to get power to pin #4 installed. The owner has to install them. Your owners manual should tell you about this and where to install them. (If you no longer have them, a trip to the dealer is probably in your future.)

I did some digging and it appears that your TV is a re-badged GMC Envoy. Looking up the Owner's manual, it doesn't tell you a lot (neither did my 2009 Silverado's). But looking at all the fuses in the pics of the fuse boxes, I'm thinking your aux power fuse is #38 in the under hood fuse box or fuse #46 in the rear underseat fuse block. You'll need a 20 or 30 amp fuse. (I paid about $12 for mine at the Chevy dealer.) Since it's basically a GM, be aware that the aux power wire is not always hooked up, either. Here's a 2008 Silverado example:
https://www.etrailer.com/question-21543.html
You may need to hook this up, too.)

Further, once the fuses/relays are installed, some trucks will supply power to pin #4 all the time and some will only do it if the ignition is turned on. You need to check to see which way your truck operates.
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Old 10-16-2016, 11:55 AM   #19
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I do not have a battery on it yet. But when I first got the trailer I was pulling it with a 05 Dodge Durango and the jack and everything worked without a battery in it ...
Towing without a trailer battery means you have no power for the breakaway switch to apply the brakes if the trailer separates from the tow vehicle. That is ILLEGAL and could be catastrophic.
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Old 10-16-2016, 04:54 PM   #20
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Towing without a trailer battery means you have no power for the breakaway switch to apply the brakes if the trailer separates from the tow vehicle. That is ILLEGAL and could be catastrophic.
EXACTLY!
Please post what dealer let you leave the lot without a battery or informing you of this.
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