1979 Mustang 5.0 won't start

Tiny
ROOTBOUND
  • MEMBER
  • 1979 FORD MUSTANG
I have a 1979 Mustang 5.0, automatic, current engine (not the original, but similar with a cam) has about 16,000 miles on it. I drove it about 100 miles without incident, parked the car in my driveway and the next day it would not start. When you turn the key, absolutely nothing happens (no click like a dead battery, no "whirr" like a bad starter, just dead silence).

The battery is fully charged, we replaced the starter relay and the battery cables. Lights, etc all work, and the car will start if you run a "jump wire" from the battery to the starter, so the starter doesn't appear to be the issue either. We also checked the ignition switch assembly box -- everything there appears to be properly connected.

I can't find anything in the Chiltons that's been too helpful (this book is pathetically organized). Things seem to be functional based upon the fact that we could get the car to start and continue to run, but the key in the ignition switch doesn't appear to be getting the message that it's time to START.

Any suggestions as to what else to check?
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Wednesday, May 9th, 2007 AT 9:35 PM

3 Replies

Tiny
ROOTBOUND
  • MEMBER
Thanks for your response. First, there is no after-market anti-theft device connected to this car--it's so nasty nobody wants to ride in it, let alone steal it.

When I turned the key to the on position, the idiot lights came on. When I turned it to the start position they went off.

While holding the key in the start position, I moved the shifter to low and nothing happened.

Thus far, I've been able to follow the directions but neither my husband nor I have been able to find the right diagram in the Chilton's to show us the location of the safety neutral switch. I know this has something to do with the transmission (to keep the car from starting while in gear I presume) but can't locate it so haven't been able to run the final check.

Anyone got a map?
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Thursday, May 10th, 2007 AT 2:37 PM
Tiny
ROOTBOUND
  • MEMBER
We'll wait until Friday but my question is, once we find it, if the wires are all connected correctly and it still doesn't "fire up", are we looking at replacing this part? If so, is this going to involve pulling the tranny or some major labor we shouldn't be trying at home?
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Thursday, May 10th, 2007 AT 5:11 PM
Tiny
MERLIN2021
  • EXPERT
Give em hell arnie!
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Thursday, May 10th, 2007 AT 7:17 PM

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