Tach Problems + Where's stock battery ground? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Gnnr · 11-14-2006, 09:58 PM

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 · 11-15-2006, 09:29 AM

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?

drew935 · 11-15-2006, 11:05 AM

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 · 11-15-2006, 03:43 PM

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 · 11-15-2006, 04:02 PM

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

MURPHY · 11-15-2006, 04:05 PM

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

Gnnr · 11-15-2006, 09:15 PM

Quote:

Originally Posted by drew935

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

What coil? On the distributor?

Quote:

Originally Posted by murphy

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 · 11-15-2006, 09:30 PM

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 · 11-15-2006, 09:48 PM

I have an S14.

incumans13 · 11-16-2006, 12:48 PM

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

11-14-2006, 09:58 PM	#1
Gnnr Post Whore! Join Date: Apr 2005 Location: S. FL Posts: 3,960 Trader Rating: (0) Feedback Score: 0 reviews	Tach Problems + Where's stock battery ground? 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. __________________

11-15-2006, 09:29 AM	#2
Gnnr Post Whore! Join Date: Apr 2005 Location: S. FL Posts: 3,960 Trader Rating: (0) Feedback Score: 0 reviews	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? __________________

11-15-2006, 11:05 AM	#3
drew935 Zilvia Addict Join Date: Nov 2003 Location: Silver Creek - San Jose Posts: 996 Trader Rating: (0) Feedback Score: 0 reviews	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. __________________ I'm driving fast -drew

11-15-2006, 03:43 PM	#4
Gnnr Post Whore! Join Date: Apr 2005 Location: S. FL Posts: 3,960 Trader Rating: (0) Feedback Score: 0 reviews	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? __________________

11-15-2006, 04:02 PM	#5
drew935 Zilvia Addict Join Date: Nov 2003 Location: Silver Creek - San Jose Posts: 996 Trader Rating: (0) Feedback Score: 0 reviews	Get a test light or use a wire and ground the neg on the coil. __________________ I'm driving fast -drew

11-15-2006, 04:05 PM	#6
MURPHY Nissanaholic! Join Date: Jan 2006 Location: fredericksburg, va Age: 35 Posts: 1,693 Trader Rating: (1) Feedback Score: 1 reviews	stock battery ground goes from battery terminal to battery tray to upper intake manifold

11-15-2006, 09:30 PM	#8
drew935 Zilvia Addict Join Date: Nov 2003 Location: Silver Creek - San Jose Posts: 996 Trader Rating: (0) Feedback Score: 0 reviews	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. __________________ I'm driving fast -drew

11-15-2006, 09:48 PM	#9
Gnnr Post Whore! Join Date: Apr 2005 Location: S. FL Posts: 3,960 Trader Rating: (0) Feedback Score: 0 reviews	I have an S14. __________________

11-16-2006, 12:48 PM	#10
incumans13 Join Date: Nov 2006 Location: San Diego Age: 41 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	Well you know you are getting signal from the ECU, I would check wiring from the ECU to the cluster.