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Old 11-27-2013, 08:57 PM
Registered User
Join Date: Jun 2007
Posts: 29
85 300 TD Wagon Electrical Troubleshoot...

Aloha All

I have an 85 300 TD wagon that is acting very electrically wierd and I thought that some of you seasoned experts might set me in the right direction to figure out what is going on.

What is happening is that most but all of the time at night- when I turn on the lights- both flashers on the dash start to flash simultaneously and the fuel and temp gauges oscillate all the way up and down. The exterior turn signals and hi/lo headlights still seem to work correctly while this is going on. This happens whether the emergency flasher switch is on or not....

I just replaced the tranny with a rebuilt and put a new (used) fuel sender unit in the tank if that might have any bearing.

Any ideas what might be going on or suggestions as to where to start looking or how to go about correcting this?

As usual, I am still looking for a good 123 mechanic who would like to come to Molokai Hawaii and stay in our B&B in exchange for showing me some things and helping me work on my wagons.

With Aloha

Levie Yamazaki-Gray
Molokai Hawaii
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Old 11-27-2013, 09:38 PM
vstech's Avatar
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,208
if you are paying for the flight both ways, I'm packing my bags tonight...
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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Old 11-27-2013, 09:49 PM
Registered User
Join Date: Mar 2005
Location: SoCal
Posts: 656
Sounds like a grounding problem to me. Did they put back the ground wire when they installed the tranny?
'85 300D Cal 280,000 miles
'07 C230 37,000 miles
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Old 11-27-2013, 09:50 PM
Rockyriver's Avatar
1985 300TD
Join Date: Oct 2013
Location: Harrisburg, N.C.
Posts: 118
Just a thought.
My 85 300TD uses dual element bulbs (1157 IIRC)on the front turn/park light and
someone had placed a single element bulb in one of the sockets causing some crazy issues.
Check for the right bulbs in the sockets.
The single element bulb shorts the park and turn signal together.
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