Light switch???

CSIPSD · Aug 21, 2014

Not getting any marker lights to the truck or trailer... Headlights work, brake and turn signals work..

Checked every fuse...

Switch maybe? I need to keep moving so I can make it back to Washington without running lights...

zilla68 · Aug 21, 2014

trailer grounded well?

PsdPullerJr · Aug 21, 2014

No markers front and rear? I lost my rear tails and it was a wire corroded off back at the bumper at one of the connectors that hook the truck to the bed.

CSIPSD · Aug 21, 2014

No markers truck or trailer, no dash lights.

CSIPSD · Aug 21, 2014

No fogs as well...

CSIPSD · Aug 22, 2014

Why would the headlights work but not the marker lights? Got to be the switch?

Do the marker lights run thru the gem module?

Dave · Aug 22, 2014

Thats a switch if its on both the truck and trailer. Unless the fuses are blown

TyCorr · Aug 22, 2014

CSIPSD said:
Why would the headlights work but not the marker lights? Got to be the switch?

Do the marker lights run thru the gem module?

Those light circuits are wired seperately coming out of the switch. I shorted out a switch once and it was doing exactly what you are describing. The question is, why did yours go as I had to probe wires to cause it.

To amswer the gem question. No I believe they go into the dr side kick panel and then to the lights on the chassis.

CSIPSD · Aug 22, 2014

No fuses blown, checked every damn one just for "fun"...

CSIPSD · Aug 22, 2014

Picking up a new switch at Ford shortly... $190... FOOKing expensive test. Hope it works!

CSIPSD · Aug 22, 2014

Well ****... That didn't work.

Arisley · Aug 22, 2014

Time to pull out the multimeter.

CSIPSD · Aug 22, 2014

Is there a relay or fuseable link I'm missing?

ToMang07 · Aug 22, 2014

I hate electrical issues.:gethim:

Good luck Joe.:lame2:

Arisley · Aug 22, 2014

There very well could be. Not sure though.

CSIPSD · Aug 22, 2014

Where is the "park lamp relay"...

Arisley · Aug 22, 2014

Is that the one under the radio right where the floorboard meets the firewall. There are three or four relays there.

CSIPSD · Aug 22, 2014

There is???

TyCorr · Aug 22, 2014

CSIPSD said:
Picking up a new switch at Ford shortly... $190... FOOKing expensive test. Hope it works!

I paid 65 for mine.

Arisley · Aug 22, 2014

Found it:

http://www.ford-trucks.com/forums/796193-wiring-and-relay-for-4h.html

The transfer case clutch relay is located in a RPO relay block. This block is behind the dash on the passenger side, up high near the base of the windshield.

The transfer case shift relay module is also behind the dash up high, but more over in the center of the dash up high behind the radio area.

The GEM module is a fairly large box with three plugs going to it, and is mounted on the driver's side under the dash, close to the driver's side kick panel area.
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