Factory tachometer problem

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#11 (permalink)

11-10-2016, 09:51 AM

patrickt

Half-Ass Member

Join Date: Jun 2005

Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum

Posts: 22,025

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Quote:

Originally Posted by wstaab

Problem is no power to the red/white wire that supplies the tachometer bulb.
The red/white wire is connected to a ground somewhere because is checks for continuity.

If you can't easily find the glitch in the harness itself, I would just cut the wires, tape off the sides going to the harness, and then run a clean feed from one of the gauge bulb feeds that works properly, along with a nice clean ground feed. Remember, a hot side feed to a filament bulb will show continuity to ground (through the filament) when there is no 12v+ on it.

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