Problems w/Autometer Tach connection to coil...
- Thread starter Loco5.0
- Start date
ram360
Founding Member
When I insall a tach I usually unplug the connector from the coil and stuff the end of the wire coming from the tach into the connector and just plug it back in. That way there is no need to cut/splice anything. Sounds like you have a bad connection where you cut it.
I tried that, but w/the wire shoved in there the coil connector wasn't making contact so the car wasn't starting that way either. I didn't actually cut the negative coil wire. I just ripped some of the rubber off & wrapped the wire from the tach around that & taped it up.ram360 said:
Stang8URMPRT
Active Member
Only thing I can see if you have the wrong wire from the tach going to the negative coil wire. I would be almost sure if you hooked up the tach wrong, it would interfere with the negative signal to the coil. My .01 1/2 cents
Nick
Nick
Stang8URMPRT
Active Member
Well, there is obviously a wiring problem, if not your fault, it's interally in the tach. Double and triple check everything. If it's all right, then call autometer, they might now the problem, or they will send you out a new one. They have awesome customer service... A sender went out on my oil pressure gauge (goes to zero when it goes bad, and I was making a sprayin' pass, looked down, I have 0 oil pressure.. FREAKS you out!) and I bought the gauge about a year and a half before that... and they still sent me a new sender for free! 
Loco5.0 said:
The red/lt green wire is 12 volt power to the coil from the ignition switch.
The dark green/yellow wire is the trigger wire that goes to the TFI module. When the TFI switches it to ground, it makes high voltage at the high voltage wire going to the distributor cap.
Three possibilities:
1.) It didn't make a good connection the first time you tried it, so it didn't kill the ignition.
2.) The wiring from the dark green/yellow wire to the tach has rubbed a bare spot in the insulation & has shorted to ground.
3.) The tach has died a sad death. Bury it and have a wake! Frolic, food & friends, gather round and morn your loss.
I'm going w/#3 so I'll replace it & see what happensjrichker said:The red/lt green wire is 12 volt power to the coil from the ignition switch.
The dark green/yellow wire is the trigger wire that goes to the TFI module. When the TFI switches it to ground, it makes high voltage at the high voltage wire going to the distributor cap.
Three possibilities:
1.) It didn't make a good connection the first time you tried it, so it didn't kill the ignition.
2.) The wiring from the dark green/yellow wire to the tach has rubbed a bare spot in the insulation & has shorted to ground.
3.) The tach has died a sad death. Bury it and have a wake! Frolic, food & friends, gather round and morn your loss.
Car RamRod
Banned
so whats the status right now? It works when sandwiched on top of the coil, with the coil wire, but when spliced it dies?
89MustangGX
I have nothing productive to add!
Seems to me you have eliminated the tach as being the problem, also eliminated the coil as being the problem, there's only one thing left -- the wiring.
You said you're sure it's right, but if what you said is true about the car starting without the tach there and a different tach does the same thing, it's not. Go back and re-check it.
You said you're sure it's right, but if what you said is true about the car starting without the tach there and a different tach does the same thing, it's not. Go back and re-check it.
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