I Have Been working on a light issue for days. The problem is all my exterior lights running, turn etc work as long as my trailer remains plugged into house current, the second it is unplugged in they go out. I have tried with a battery in as well as with the battery out and have the same results. I have tested the 7-pin plug on the truck it is working properly

That is strange - The TRAILER SAFETY LIGHTs are powered up by the TRUCK through the 7-way connector. Has nothing to do with the trailer BATTERY setup.I use one of these 7-way testers on my Ford 7-way setup. If this works normal when plugged into the 7-way Connector then I am assured the truck side is OK... The only connection from the 7-way connector to the trailer wiring would be the 12VDC lead coming from the truck start battery used for trickle charging the trailer battery when in route.ETRAILER.com is a great place to look at some typical wiring diagrams of the trailer safety wiring etc...All of my 2010 F150 truck safety signals are separately fused at the truck fuse panel and most everything going back to the 7-way connector is controlled by the truck ignition key being ON...Have never seen this problem before...Roy Ken

jules6 wrote:This might be a bad groundX2

Just asking here, but is it possible a previous owner had the lights set up like some I have seen with all the clearance lights working when parked at a CG? I have no idea why anyone would want to do this, or why they feel the need to light up their site(s) with clearance and tail lights but it happens.

No I bought it new has had no modifacations. Also I could use my landing jacks without a battery just by being pluged into the truck. This pin is hot from the truck but is not gitting to thr jack motor

Running Light Problem | Good Sam Community

11 Replies

RoyB
Explorer III
Sep 07, 2014
That is strange - The TRAILER SAFETY LIGHTs are powered up by the TRUCK through the 7-way connector. Has nothing to do with the trailer BATTERY setup.

I use one of these 7-way testers on my Ford 7-way setup. If this works normal when plugged into the 7-way Connector then I am assured the truck side is OK...

The only connection from the 7-way connector to the trailer wiring would be the 12VDC lead coming from the truck start battery used for trickle charging the trailer battery when in route.

ETRAILER.com is a great place to look at some typical wiring diagrams of the trailer safety wiring etc...

All of my 2010 F150 truck safety signals are separately fused at the truck fuse panel and most everything going back to the 7-way connector is controlled by the truck ignition key being ON...

Have never seen this problem before...

Roy Ken

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Running Light Problem

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