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Old 05-09-2020, 07:59 PM   #1
Mini-Skoolie
 
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Join Date: Feb 2020
Location: Way Out West
Posts: 21
Year: 1991
Coachwork: Century
Chassis: C5500, Bus not a School Bus
Engine: 3116, CAT, 215HP
Rated Cap: 30k
GMC Topkick/Kodiaks

Has anyone here had to deal with an in-op tachometer in a Topkick or a Kodiak in the 91-97 3116 models before?

Key on the tach hops a little bit. Cranking over it moves as well but once the truck is running nothing.

I thought I had a wiring problem at the alternator so I installed a new one and new plug. No difference. I picked up a used cluster from another diesel model and no go. The wiring diagram doesn't show any connections that I havent inspected.

I am hoping there is a test method I can use to sort out of I have just have 2 bad clusters or there is something else going on.

TIA
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Old 05-09-2020, 09:06 PM   #2
Bus Nut
 
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Join Date: Sep 2013
Location: Virginia
Posts: 910
Year: None
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Sounds like you covered the basics. While it's certainly possible that both your original and the replacement cluster were bad, I don't think it likely unless it is a common problem to that model. There is always a possibility that there is a difference in signal between year models. Otherwise it would appear that whatever triggers tachometer from either the injection pump or elsewhere is fried.
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