Exterior light circuit schematic? - Ford Powerstroke Diesel Forum
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post #1 of 14 Old 08-26-2019, 03:22 PM Thread Starter
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Exterior light circuit schematic?

I posted about this in the Electronics section, but figure there's more eyes here.

tl;dr - My exterior light 15a fuse immediately blows when I flip the headlights on. I've removed all the bulbs all the way around, still blows - so I'm 99% certain it's a wire rubbed through somewhere.

Hoping someone has the diagram so I can start tracing the wiring... ?

Thanks!
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post #2 of 14 Old 08-26-2019, 05:07 PM
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Have you checked at the trailer plug for loose wires?

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post #3 of 14 Old 08-26-2019, 05:28 PM Thread Starter
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Key off, headlight switch off, no fuse in the #17 spot.

Ran a continuity test to ground - only the bottom left of the 7 pin and single 'exposed' of the 4 pin beeped at me. That leads me to believe no shorts to ground in the wiring between the fuse and the receptacle for the trailer wiring.
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post #4 of 14 Old 08-26-2019, 05:49 PM
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Possibly the wiring in the steering column that runs to the headlight "dimmer" switch? -- the transmission shifter mechanism and the wiring in the column can get together and cause all kinds of fun problems -- could disconnect the column harness and see if that locates the problem

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post #5 of 14 Old 08-27-2019, 04:12 PM Thread Starter
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I'll check out the wiring in the steering column, too.

Nobody has the schematic, though? It'd be extremely helpful to know where the fuse sits in the circuit, for instance, so I can test both sides of the fuse (and hopefully narrow down where my bad wire is!)
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post #6 of 14 Old 08-27-2019, 04:26 PM
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This help?
Attached Files
File Type: pdf Wiring Diagram - 2005 Powerstroke 6L - F-Series - Single Alt - Full.pdf (3.49 MB, 10 views)

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post #7 of 14 Old 08-27-2019, 04:46 PM
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These might be better.
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File Type: pdf 6.0L Lighting 1.pdf (291.2 KB, 17 views)
File Type: pdf 6.0L Lighting 2.pdf (188.3 KB, 11 views)
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post #8 of 14 Old 08-29-2019, 04:31 PM Thread Starter
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Appreciate it, but it's hard for me to read 'em. I just bought the stupid electrical wiring manual, so I'll be able to track down any future electrical issues with ease
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post #9 of 14 Old 09-15-2019, 06:38 PM Thread Starter
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Update on this!

Wiring book came in. What a freaking difference that made

Ruled out any issues pre-headlight switch. It's the brown wire. Disconnected *everything* external, checked for continuity between the brown and black wires on the mirrors - confirmed I have a short in the wiring.

Tone generator showed up today, but I was in the middle of rewiring my FIL's old trailer, so didn't get a chance to start tracing today.

Hopefully I'll be able to find out more this week, though!
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post #10 of 14 Old 09-20-2019, 07:06 AM Thread Starter
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Took the day off of work for some appointments, trying to do more diagnostics.

I've disconnected every single connector I've been able to locate - still have short to ground on the exterior lighting power wire (brown). Got my hands on a tone generator, and it turns out since I'm shorting to ground, trying to trace the wire in the dash is a lost cost - every ground (including the metal frame) is naturally causing the tone locator to light up!

I've basically resigned myself to having to take the entire dash out at this point. I DO have an '08 dash I was intending to swap - maybe I'll just start on that. At least after all the effort I'll have something a little more worthwhile than 'the exterior lights work again'
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