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Old 11-16-2003, 03:48 PM
flyloki's Avatar
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Join Date: Oct 2003
Posts: 15
ACC Electrical Circuit Problem

1985 300TD

Driving down the road with heater on - the seatbelt light flashed on and off, at the same time the ACC fan slowed then came back on. Now ACC unit is acting a bit flakey. Fan and vent servos seem to work normally but I'm only getting heat.

Checked fuse box and the fuse for the monovalve, back up lights, horn etc is blown. Had recently put a hitch on car and done a few spotwelds w/o disconnecting battery. Could this have shorted the circuit through back up light ground or similar?

Where to check first? I will look at the ACC board tonight but is there any other fuse that could be blown taking out the circuit?

Thanks for any help-

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Old 11-17-2003, 02:58 AM
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Join Date: Feb 2002
Location: Belgium,Europ
Posts: 196

Welding without disconnecting the battery. That against all odd's !
I would be very surprised if your A/C board wouldn't be shot, at least some electronical parts in it !

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Old 11-17-2003, 10:21 AM
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Re: Welding

I know, I know. I said the same thing to my buddy who was doing the welding (an ex MB tech no less!) and he was like "should be fine way back here". :rolleyes

Would bad AC board also take out reverse lights?
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Old 11-19-2003, 12:51 PM
flyloki's Avatar
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Join Date: Oct 2003
Posts: 15
For future reference....

OK everyone, all together now---CHECK YOUR FUSES

or better yet


If you have the bullet style it more than likely they will be at least 20 years old. Number 14 had a little crack that was too small to see and was causing the problem. It's cheap insurance and often overlooked or causing unseen problems.

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Old 11-19-2003, 05:11 PM
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Join Date: Jun 2003
Location: SF Bay Area
Posts: 599
As good practice one might consider replacing ceramic fuses every 5 years. I was/am in the habit of replacing them whenever I perform a 90-k service!
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