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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 08-22-2014, 07:21 PM   #1
86 newbie
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Default total wire disaster

hey so i was driving my 86 5.0 when the pos bat cable came off and hit the hood. magic smoke came from inside the car as i was pulling over. so now when i turn on the key nothing happens except my mechanical oil and temp gauge lights turn on even when the lights arnt turned on. so you guys, where do you think i should start looking? oh and all my fuses are good (surprisingly)
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86 5.0
A/C delete kit
under drive pulleys
Jegs Off-road h-pipe cat delete
Hurst short throw shifter
flow master exhaust
2 10" kicker comp sub's with a 1000 watt Kenwood amp
F-1 racing Stage 2 Clutch
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Old 08-23-2014, 04:55 AM   #2
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I suspect you blew a fuseable link someplace.
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Old 08-26-2014, 04:15 PM   #3
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First look for melted or burnt wires. then check fuse links.
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Old 09-01-2014, 06:35 PM   #4
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i looked at the fuse links and all fusses but couldn't find anything. now when i connect the bat, sometimes everything will come on like its supposed to except the fuel pump. it will even turn over. Than other times nothing will even come on except the dash lights will turn on.
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86 5.0
A/C delete kit
under drive pulleys
Jegs Off-road h-pipe cat delete
Hurst short throw shifter
flow master exhaust
2 10" kicker comp sub's with a 1000 watt Kenwood amp
F-1 racing Stage 2 Clutch
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Old 09-02-2014, 02:07 PM   #5
88 orangepeel notch
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Just to clarify, you looking at the fuseable links means you tested them right? If they did test good, I feel sorry for you and the can of worms your about to open. I don't care for electrical gremlins, but with patience and know-how, I've had some luck fixing them.

I don't even know where to start here, but verify all battery cables are tight and a good clean connection, especially the ground. It's odd that it'll turn over sometimes, maybe a fried starter solinoid, ignition switch, etc. My car had a bad ECM which took a while to figure out, intermittent fuel pump prime among other odd happenings. Do you have a spare laying around to swap? The computer usually don't do well with a shock like that.
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Old 09-03-2014, 02:14 PM   #6
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I don't have any extra comp laying around. a couple of people have pointed me to the ignition switch being bad. can anyone tell me how to test this?
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86 5.0
A/C delete kit
under drive pulleys
Jegs Off-road h-pipe cat delete
Hurst short throw shifter
flow master exhaust
2 10" kicker comp sub's with a 1000 watt Kenwood amp
F-1 racing Stage 2 Clutch
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Old 09-07-2014, 05:06 PM   #7
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i replaced the ignition switch and the battery cables today. It seemed to work for about 10 min then everything shut off again. I wiggled my harness around and that seemed to have an effect of it but as i took off the tape that held all the wires together i couldn't get the result anymore. I spent a good 2 hours wiggling wires and couldn't find anything. Anyone got any ideas??
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86 5.0
A/C delete kit
under drive pulleys
Jegs Off-road h-pipe cat delete
Hurst short throw shifter
flow master exhaust
2 10" kicker comp sub's with a 1000 watt Kenwood amp
F-1 racing Stage 2 Clutch
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Old 09-08-2014, 09:14 AM   #8
88 orangepeel notch
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Now's where I'd start to find out what your losing when the car dies, fuel or spark.

Also, pull codes to see if that will narrow this down a little.
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306 with all bolt ons, letter cam, ported E7's, T5 swap, full exhaust, 3:55's, 2" drop, and the worst paint you'll ever see or feel.
Dyno'd 300/316, 2745lbs-track scale
Best ET………12.4@108, 1.66 60ft on 8" ET Drags.
24 mpg (combined)
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Old 09-08-2014, 11:11 PM   #9
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Ok, im switching it to a carbed 306 anyways so i have to take out the computer and wiring harness anyways so i might just do that and see if the problem is still there and if it is well there will be less wires to go through lol
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86 5.0
A/C delete kit
under drive pulleys
Jegs Off-road h-pipe cat delete
Hurst short throw shifter
flow master exhaust
2 10" kicker comp sub's with a 1000 watt Kenwood amp
F-1 racing Stage 2 Clutch
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Old 09-08-2014, 11:11 PM
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