Diesel engine
SOURCE: LEFT TRAILER TURN SIGNAL DOES NOT WORK
I'd get a 12vdc test light if you don't have one already & start from plug, and keep probing back from there. It may be as simple as a bad connection under truck where joined into harness.
SOURCE: 02 RAM 2500 no power at trailer plug
It should have a fuse for the marker lights. Do they work on the truck. Brown is the color for the marker lights. Good Luck
SOURCE: 2003 Dodge Ram 2500 diesel 4x4 wiring diagram
TPIM PROBLEM , MUST HAVE COMPUTER FLASHED AT DEALERSHIP
SOURCE: LEFT TRAILER TURN SIGNAL DOES NOT WORK
I have seen once before that the fuse box was bad on a 2003 Dodge 3500. I had power in and nothing out. We had to replace the box. Not cheap! Hope it is simple like a loose connection though. I think I had to pull the inner fender on the drivers side to access the bottom of the fuse box. Pain in the ****, but...
Fuses
Position Amps Description
1 20 Trailer tow back-up and tail lamps
2 10 Air bag diagnostic monitor
3 15 Power locks
4 15 Air suspension
5 20 Horn
6 15 Audio system
7 15 Parking and tail lamps
8 30 Headlamps
9 15 Daytime running lamps and fog lamps
10 25 Auxiliary power point
11 - Not used
12 - Not used
13 - Not used
14 60/20 4WABS/rear anti-lock brake
15 50 Air suspension compressor
16 40 Trailer tow battery charge and stop/turn lamps
17 30 4WD transfer case shift motor and clutch
18 30 Driver power seat
19 20 Fuel pump
20 50 Instrument panel fuse panel ignition switch feed
21 50 Instrument panel fuse panel ignition switch feed
22 50 I/P fuse panel battery feed
23 40 I/P blower
24 30 PCM power
25 30 Power windows
26 - Not used
27 - Not used
28 30 Trailer tow electronic brake
29 - Not used
Relays
Position Description
1 Windshield wipers HI/LO speed
2 Windshield wipers run/park relay
3 Washer pump relay
4 Fuel pump relay
5 Horn relay
6 PCM power relay
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