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  68 factory tach/ignition woes...again!

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Author Topic:   68 factory tach/ignition woes...again!
sigtauenus
Gearhead

Posts: 1602
From: Beaufort, SC
Registered: Jun 2000

posted 09-18-2001 02:15 AM     Click Here to See the Profile for sigtauenus   Click Here to Email sigtauenus     Edit/Delete Message   Reply w/Quote
Alrighty... some of you may remember a few months back I had this problem with my car not starting. Actually, with the key twisted to start, it would turn over and fire, but when I released it from start to ignition on, it would die on me. At the time, I found some exposed wires where the wires feed into the ignition switch and figured one of them was grounding out. I cut out the ignition switch and spliced in new wiring (a Ford kit) and a new switch and everything worked great for 3 or 4 months until today. Same damn thing happened this morning with it firing then cutting out.

Well, I poured over the electrical diagrams and figured it had to be something going on with the pink resistance wire, and from experience I remembered that the tach is wired in series with the pink wire. I pulled my instrument cluster, disconnected the tach and plugged the tach feed wires (the pink wires) into each other (bypassing the tach) and the car started right up.

So, now I'm looking at a factory 8000 rpm tach with a short in it somehow that is keeping the car from running.

I gotta get another car to drive to work every day. I love my mustang, but relying on it daily and dealing with crap like this is going to make me want to sell it.

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Dan warren
Gearhead

Posts: 71
From: bothell Washington
Registered: Aug 99

posted 09-18-2001 03:20 AM     Click Here to See the Profile for Dan warren   Click Here to Email Dan warren     Edit/Delete Message   Reply w/Quote
You probably have an open circuit in you tac not a short. A bad(open)Resistor wire( the pink one) will do the same thing. Dan

------------------
68 Shelby Gt 500 Conv.68 GT Fb 302 .84 Gt 350 5.0 Conv.

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mellowyellow
Gearhead

Posts: 4608
From: So. Fl.
Registered: Aug 2000

posted 09-18-2001 06:37 AM     Click Here to See the Profile for mellowyellow     Edit/Delete Message   Reply w/Quote
As I recall, about a year ago, didn't you have an extra pink resistor wire in stock?? By the way, looking through the old NPD catalog { been trying for a month to get a new one!!} they list that wire. Apparently it's a pain in the a** item enough to be stocked.

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sigtauenus
Gearhead

Posts: 1602
From: Beaufort, SC
Registered: Jun 2000

posted 09-18-2001 11:34 AM     Click Here to See the Profile for sigtauenus   Click Here to Email sigtauenus     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by mellowyellow:
As I recall, about a year ago, didn't you have an extra pink resistor wire in stock?? By the way, looking through the old NPD catalog { been trying for a month to get a new one!!} they list that wire. Apparently it's a pain in the a** item enough to be stocked.

Mellow, yes, I do still have that wire, bought it from NPD a few years ago when this happened then. I just don't know how to find the problem, because everytime it happens, I open up the dash, poke my head around, wiggle some wires, change some stuff out, and it works again. This time all I did was bypass the tach and it worked again, so I'm not sure that its the pink wire.

Very perplexing.

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