83 300D-T intermittent tach problem - PeachParts Mercedes-Benz Forum

#1 05-31-2000, 05:08 PM

Sometimes the tach just goes wild. It may peg at max rpm's, or bounce back and fourth. I've installed a new tach amp (round thing on drivers fender), and replaced the original tach with a used one. The problem is the same. I need some help guys. Any ideas? Thanks in advance.

Benzmac · #2 05-31-2000, 09:30 PM

You have a ground problem or loose wire. You will have to check from top to bottom. Do you have a ETM? (electrical troubleshooting manual?)

They are in the CD we offer in Partsshop.

------------------
Benzmac:
Donnie Drummonds
1992 500E (very soon I hope

1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
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co.aulakh · #3 05-31-2000, 10:16 PM

try removing the instrument panel .clean the ground connection between the plates holding the various meters after removing the screws.
it worked for me.

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