From: Bruce Beattie (bruce@eecs.berkeley.edu)
Date: Mon Feb 17 2003 - 12:27:28 PST
Hi Joe,
Dave is not very encouraging is he? :)
I have a M1008, but I'm still new at this. I suspect that the ignition relay
(not sure if that is the correct term here) is using the path thru the
headlights to go to ground in order to keep itself energized. So look at the
wiring diagrams and figure out what would have to happen for this to be true,
and I think you will find the problem.
This is only an educated guess, and I am sure that there are much better
opinions out there.
Bruce MVPA 23824
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
> appreciated.
> Thanks in advance.
> Joe
> .
>
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