1993 mustang electrical nightmare - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 12 Old 11-16-2018, 01:53 PM Thread Starter
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1993 mustang electrical nightmare

Ok guys im going to try and explain this as best as I can my 1993 mustang gt is acting crazy!!
So for the past week or so ive had a few electrical issues nothing I was to worried about. A few examples are my dome light went out. My headlights flashed once and about a month ago my headlights went out all together for a min while driving. Well I decided to drive home to Nashville for the holidays and was installing a new head unit and I couldn’t get it working. Tested to wiring with two separate multi meters and got zero volts from the stereo siring harness. So, I then turn the car all the way on and took both my multi meters and tested the back of every fuse in the panel and got zero volts from all of them (weird….) so I then pulled every fuse and they all were fine. how is that possible with most all the accessories the power were just fine? I then turned my car off changed my oil then tried again first testing the fuses on the back side again all but one had volts this time fuse #6 so I pulled it but this time it was fried. I replaced it decided to go for a drive and on that drive my door chime came on wont go off. My dome light came on and now won’t go off. My head lights flashed, and my dash lights flickered on off several times and the needles were jumping all over the place. I come home park it and this morning the damn door chime and dome light are still on. What do I do?? I was supposed to leave for home today. Also side note I believe my heater core is messed up to because I also smell strong antifreeze in the car and ive had to put about 3 gallons of anti-freeze in her over the last week-two weeks could this be related?

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post #2 of 12 Old 11-16-2018, 02:19 PM
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You're not going to fix these problems in 1 day. Park it & rent a car. Or would you like to get stranded in the snow & cold & die?


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post #3 of 12 Old 11-16-2018, 03:24 PM Thread Starter
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You're not going to fix these problems in 1 day. Park it & rent a car. Or would you like to get stranded in the snow & cold & die?
I've already decided to stay home and I can't afford to rent a car any idea what could be wrong with it would be greatly appreciated if I can get her back on the road
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post #4 of 12 Old 11-16-2018, 03:58 PM
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Do you have a evtm for your car?

You are going to need to know the power and ground locations

I can tell you how test, once you know where to test

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #5 of 12 Old 11-16-2018, 10:14 PM
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Park it and beg, borrow, rent another car. With it using that much coolant, it's not reliable enough for any long distances, anything more than a mile or so.

These cars are getting old, they aren't what they used to be. They're more novelty now than daily driver UNLESS you like working on them a lot or you pay someone to properly completely restore it to OE specifications using OE parts-which costs a ton.

I think you have several different problems, but I'm not the one to help you find/fix them because I'm not on this site often.

'92GT, 427" and '93 "LXVO" coupe
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post #6 of 12 Old 11-16-2018, 10:58 PM
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He means the Electrical and Vacuum Troubleshooting manual which part of can be found here

Fuel Injection Technical Library » Mustang EVTM?s

Good luck and I'd listen to indy2000, he'll help ya out

1993 Cobra #1282
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post #7 of 12 Old 11-17-2018, 09:58 AM
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It almost sounds like you don't have a ground to the chassis from the battery negative post for the electrical part.


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post #8 of 12 Old 11-21-2018, 07:45 PM
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Check the main passenger compartment harness. It leads from the fuse block inside to driver side kick panel then along the rocker panel just under the carpet. It's not protected and can get pinched where it runs over raised portions of the floor pan. Mine shorted out on my 89 and almost burned my whole car up. I caught in time and only had to resplice over 100 wire leads and replace the carpet. Late model resto now offers a replacement cabin harness but its a bit pricey, I think about 800 dollars.
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post #9 of 12 Old 11-22-2018, 02:14 AM
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Maybe take a look at the ignition switch. They are notorious for falling apart. When they separate, all kinds of funky things happen. Intermittent problems of all sorts. Hope you get it lined out.
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post #10 of 12 Old 11-22-2018, 01:01 PM
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Quote:
Originally Posted by 6v89stgn View Post
I caught in time and only had to resplice over 100 wire leads and replace the carpet.


“Only” lol


1993 Cobra #1282
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post #11 of 12 Old 11-22-2018, 02:54 PM
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The shop manual really came in handy that time
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post #12 of 12 Old 11-26-2018, 12:37 AM
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Minor Hijack: Thanks for posting the link to fuelinjectedford.com, as I had not visited there before. What a great reference point for Ford EEC information!

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