Tach Problems + Where's stock battery ground?

[Gnnr]

After trying to fix the last owners wiring stupidity, my car started to go haywire so I put the grounds on the battery terminal back to how they where, and everything started to work again. Except now my tach is messed up. The RPMs don't read at all (stays at '0') and my MPH goes up very slowly (in lazy fashion). I tested the fuses in the engine bay (but not under dash yet) and they're fine. What could have gotten fried? This is in a stock s14 with auto tranny.

Also, what is the stock location of the battery ground cable? The previous owner had some dumb crap going on and I don't think its even the right gauge size wire.

Thanks ahead.

[Gnnr]

To add to the wierdness. I have a Greddy MSS tapped into the ECU. Its giving me my RPM readout, but the Tach isn't doing so. Anyone? :confused:

[drew935]

I suggest to read the FSM since you just need to retrun things back to location configuration. You have a ground not hooked on the distributor maybe.

[Gnnr]

I have the FSM, I'll look at it for the ground part. Now does anyone know what the problem could be for the RPMs not reading on my tach and the lazy needle movement for the MPH all of sudden? :(

[drew935]

Get a test light or use a wire and ground the neg on the coil.

[MURPHY]

stock battery ground goes from battery terminal to battery tray to upper intake manifold

[Gnnr]

Get a test light or use a wire and ground the neg on the coil.

What coil? On the distributor? :confused:

stock battery ground goes from battery terminal to battery tray to upper intake manifold

Ahh, I may be missing the upper intake manifold bit. I'll double check that with what I find in the FSM.

[drew935]

the tach should be hooked up to the neg wire on the ignition coil. S13 is external, S14 internal. Not sure which car you have.

[Gnnr]

I have an S14.

[incumans13]

Well you know you are getting signal from the ECU, I would check wiring from the ECU to the cluster.