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#1
05-14-2008, 05:01 PM
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1985 300d tachometer test.
Hello,
I need help to test the tachometer for my 1985 300d. How much voltage can I run to test the tachometer if it jumps or not. Thanks for the response. 
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#2
05-14-2008, 05:29 PM
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Good question. The '85 is a different beast than the prior years.
__________________
RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#3
05-14-2008, 06:49 PM
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Don't use even the smallest battery directly connected to the tach -- use an ohmmeter. They send a small current through whatever resistance you are measuring, that's how they work. Use a low scale (1000 ohms or so) as that will have the lowest voltage. The ohmmeter will measure the resistance of the meter coil (infinite = bad tachometer) and will make the tach needle "bounce." Try touching the test leads gently at first so that you don't pin the tach (drive it up or down against the stops) and damage it. If you have the ohmmeter connected "backwards" the tach will try to move down scale rather than up. Reverse the leads to make the needle move in the correct direction. If you can get the needle to move then the tach is probably good.
Jeremy
__________________
 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#4
05-14-2008, 07:36 PM
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Thanks a lot for the help
Thanks a lot.
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