From: J Travis (firstname.lastname@example.org)
Date: Mon Feb 17 2003 - 12:15:09 PST
It may well be a bad underdash wiring harness, but it also sounds like
it MIGHT be a floating ground. Check ALL the ground connections, under
the dash from the harness, and also any from the engine to the frame and
from the body to the frame (if any). Sand down the ground connectors
and the place where they make contact, and check the ground straps to
see if they are oil-soaked and/or broken, thereby offering intermittent
resistance. If that doesn't work, the next step involves a chicken, a
knife, tribal drums, and learning to recite a Voodoo chant, so let's
hope this cures it.
Joe Boone wrote:
> To the List:
> I have the strangest electrical problem that just occurred with my
> 1984 M1008, which must be a short or bad switch of some sort.
> With the engine running, when the master service light switch is
> turned on and the headlight switch turned on, the turn signal
> indicators light up - don't blink, just stay on, but turn signals
> still work. The fuel guage needle and voltmeter drop to a zero
> reading. Windshield wiper motor doesn't work (check the fuse - OK).
> Turn ignition switch to the "off" position, but engine keeps running.
> Push in the headlight switch and the engine shuts off.
> Checked both batteries and alternators and charging is within specs in
> the manual. Starter and glow plug relays are new. I replaced the
> glow plug card with a manual push button (this was done long before
> this problem appeared).
> I'm stumped. There's nothing in the troubleshooting sections of either
> the unit maintenance manual or the depot level manual which addresses
> this problem. I'm thinkng either (1) bad headlight switch, (2) bad
> ignition switch (on lower steering colum under dash), or (3) bad
> master service light switch, (4) bad ignition key switch in steering
> column, or (5) electrical short somewhere in the wiring. Finallly,
> the starter solenoid "stutters" occasionaly, like it's not getting
> good voltage to engage the flywheel, then it will start right up.
> Starter/solenoid were recently rebuilt.
> Any help from the electrical "gurus" on the list would be greatly
> Thanks in advance.
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