Join Date: May 2007
Location: Baltimore Maryland
Re: Is my tach ruined?
First things first, IMO I would shy away from running a one wire alternator. One wire alternators do not charge until they reach a certain rpm(usually 1000 give or take) and they do not charge at idle. So, if you have any extra electronics, it is going to put a serious strain on the system.
Second, tachometers as far as I know are not connected to the alternator. At least my aftermarket isn't. It has a power, ground, illumination, and rpm signal. You said it is an OER, you may be able to test it by running the wire directly to their respective destinations. What I mean is, do not use the factory wiring, it may have a problem with the OEM wiring. Run a power wire, a ground, you shouldn't have to worry about the illumination, and run a signal wire to the distributor. That will tell you if it is a problem with the wiring.
Charlie Knudsen 67 Camaro RS/SS 350 TKO 600, 4.10's, AFR 195 Street Heads, Comp 270H, Rhoads Lifters, Crane Ignition, Pertronix Dizzy, Performer RPM Q-Jet, Heavily Modified Q-Jet, Hooker Comp Headers, MagnaFlow 2 1/2", 144 Decibles(Alpine CDA-7998 Head Unit, RF X7 and RF 750X Amps, MB Quart Mid's & High's, Kicker L7 12" Solo Barics)