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post #1 of 4 (permalink) Old 04-19-2019, 09:34 PM Thread Starter
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Headlight wiring question

I just recently got a 2003 3500 auto and I’m loving it already. The person before me has wires ran everywhere on it though. I consolidated as much as I possibly could. But I noticed a wire running out of a loom on the passenger side under the intake. It was spliced from there to the passenger side headlight socket then under the radiator to the driver side headlight socket. Is this right? Or some kind of homemade jumper wire?

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post #2 of 4 (permalink) Old 04-20-2019, 09:16 AM
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Looks like it isn't right... each light has its own wires from the FCM
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03 2500 SO QC 4x4. Airaid, 2nd Gen Intake, Grid Heater Delete, D-Tech 62/65/12, Magnaflow. Bully Dog: Propane Injection, Triple Dog W/Outlook Crazy Larry. Edge EZ, BD Flow-Max, frame mount 3 Micron filter W/Water Separator, Big line kit "Wild Cat Version" 48RE: Sonnax Sure Cure/Transgo combination, Derale turbulator, billet input, Triple Disc,Super servo, 4 ring Accumulator.
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Last edited by dhoagland; 04-20-2019 at 01:41 PM. Reason: Called module the wrong name
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post #3 of 4 (permalink) Old 04-20-2019, 09:53 AM Thread Starter
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Hmm makes me wonder if there wasn’t a reason they did it that way..
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post #4 of 4 (permalink) Old 04-20-2019, 10:40 AM
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03 has the IPM (FCM + PDC).
FCM (Front Control Module) drives the headlights.
FCM is plugged in to the PDC and there are wirings from PDC to headlights.
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