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  #1  
Old October 17th, 2004, 06:34 PM
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Ken Loy
1994 Portofino Red ST
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Instrument Panel wiring

Things went from so-so to bad today. The bulbs on my speedo burned out and I pulled off the instrument panel to replace them. Did so but now there appears to be a short somewhere and none of the dash lights are working. I jumpered the red power wire to a known good source and it works ok. Followed all the wires as far as I could behind the instrument panel, but can't find the source of the short. There's no power to the canon plug which services the panel lights. No power at the dimmer switch. If I jiggle the wires enough, I can even get the radio to momentarily turn off, but I just can't find the source of the short/loose wire.

A previous owner added several switches for lights that I'm not using and I'm thinking of pulling everything out that doesn't look like it belongs so it might be easier to figure out whats wrong.

When I look behind the instrument panel on the left side, I see a couple of relays and fuses screwed onto the bulkhead. Are those supposed to be there?

The workshop manual of course is crap when it comes to wiring diagrams. Is there a better source, or do y'all have any other ideas? Until it gets fixed, I'm going to look pretty funny (as if I don't already) driving at night with a headlight on my forehead...
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  #2  
Old October 17th, 2004, 06:41 PM
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Jim Cheney
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If you can afford to take the truck off the road for a week, the dash harness is easy to remove after you disassemble the dash. You could pull the loom on a saturday, fix it during a few evenings, and reinstall the next saturday. Once is it out, it is very straightforward.
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Old October 18th, 2004, 12:17 AM
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Ken Loy
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Thanks Jim. From all that I've looked at, it seems like pulling off the dash is a PITA. Also, looks like the only way that I can really see what's behind the instrument panel. I imagine the AC will only make it worse.

Couldn't find the wiring harnesses on anyone's websites. Any idea on the cost?
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  #4  
Old October 18th, 2004, 09:03 AM
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Your problem is you are not driving it through enough deep water to clean out all the contacts. I think the problem may be just a dirty connection, have you looked at the fuse for the dash lights? I know I have had to clean or replace a few of the connections at the fuse box in the cab due to them being dirty, I use electrical contact cleaner i bought at an electrical distributer.

What workshop manual do you have? Mine goes into pretty good detail about the wiring.
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Old October 18th, 2004, 09:38 AM
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David Marchand
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A couple things I learned from my recent fun with dash wiring:

Always check to make sure the fuse and relays you just pulled to check, are properly reseated. (I tore back into my binnacle because I thought I had grounded wires and then discovered the fuse was barely in that I just checked).

Check any wires near the dash supports, behind the instrument fascia. I found two wires on mine had rubbed against the support sufficiently to ground out.

As Mike said, check the connections wherever possible and perhaps add some dialectic while your there.

If all else fails. Get yourself a test light and start checking the connections (for continuity) from the dash to the fuse panel. Since it sounds like your problem is there. I would hold off on stripping down the dash until you figured out the problem wire(s).
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Old October 18th, 2004, 09:41 AM
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Ken Loy
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the fuses are fine, mike. remember that i don't wade as deep as you do.

workshop manual: the link you gave me from ee. I haven't found a good description of where the components are located, just the wire colors and even that is spotty.

what do you you think about opening the dash?
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Old October 18th, 2004, 10:16 AM
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I think opening the dash is a last resort. I have a real manual from Rovers North, I'll bring down a copy of the pages you need this weekend. And have a look at it as well.
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