Electrical help plz

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Aug 24, 2015 | 07:19 PM

kupiec20

Thread Starter

Fleet Mechanic

Joined: Nov 2007

Posts: 1,263

Likes: 11

From: DARTMOUTH MA

Electrical help plz

Ok
So I took my truck down to the frame. All I need is my front bumper and my lights to work in the rear.
So my headlights work, markers work all in the front and on top.
Brake lights work, brinkers work front and rear. But for so reason my rear running lights don't light up.? Any idea why? Ty

Aug 25, 2015 | 10:15 AM

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

Likes: 37

From: Madison, WI

Do the front parking lights work? Do the dash illumination lights work?

Aug 25, 2015 | 12:19 PM

cowmilker08

Logistics Pro

Joined: Oct 2008

Posts: 4,818

Likes: 1

From: Avilla, IN

Tried new bulbs? LOL, probably a silly suggestion but that's the first thing that came to my mind.

Aug 25, 2015 | 04:56 PM

ved0303

Mountain Pass

Joined: May 2014

Posts: 177

Likes: 1

From: Texas

Yeah after you check obvious stuff like bulbs, sockets, fuses. I would just start chasing the wires forward toward the cab. If I understood right, you have the bed off so this should be relatively easy. Use a multimeter to test for power at different points along the way. A wire may have been pinched or chewed somewhere.

Aug 26, 2015 | 08:24 PM

kupiec20

Thread Starter

Fleet Mechanic

Joined: Nov 2007

Posts: 1,263

Likes: 11

From: DARTMOUTH MA

Bed is back on.
-headlights work
-parking lights up front work
-brake lights work
-blinkers front and back work
-cluster lights work
-reverse lights work
So if my reverse lights and blinkers in the rear work...it wouldn't be the bulbs. Correct?
***also my license plate lights DONT work.
Does the multiethnic function switch have anything to do with my issue?
Ty

Aug 26, 2015 | 08:33 PM

madpogue

Lead Driver

Joined: Oct 2003

Posts: 8,476

Likes: 37

From: Madison, WI

Could be the bulbs. The rear bulbs behind the red lenses have two filaments. The bright filament comes on with the brake lights, the turn signals and the emergency flashers. The dim filament comes on with the parking lights (aka taillights). So the turn signals working does NOT mean that it's not the bulbs. It could be that the bright filament is good, but the dim filament is burned out, on both.

Are you sure you have the correct bulbs, 3157, in those sockets? A 3156 bulb will work on the bright filament (brake, turn, etc), but it doesn't even have a second filament, so it won't light up with the parking lights.