Another Weird One - Electrical Shock from Body - Mustang Evolution

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Old 05-24-2016, 10:05 PM   #1
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Another Weird One - Electrical Shock from Body

I was checking the sway bar linkage and as I pulled myself under the car to reach it, I touched bare metal around the drivers side blinker housing where paint was chipped and received an electrical shock. I touched around and could feel it on the bumper and on the lower control arm. It was enough that you could not hold on it.
I turned the headlights on and off, this removed the shock and must have dissipated the charge. It has been 4 hours since it was driven.
One of the things I fixed recently was that the block to frame ground strap was missing, so I installed one. This seemed to fixed some electrical issues, as you would expect. The car starts and drives fine.
The only thing that I can think of that would hold a charge that would cause a shock is the coil. This is also newly replaced in the last few months, with the distributor at the same time.
Any ideas would be very much appreciated. It's too late to start messing with it tonight. Thanks.
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Old 05-24-2016, 11:03 PM   #2
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Do all the lights work?
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Old 05-24-2016, 11:05 PM   #3
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Do all the lights work?
Everything works, Lights, taillights, blinkers, radio, wipers, gauges, etc. Car idles fine and runs fine.
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Old 05-24-2016, 11:29 PM   #4
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Stock wiring?
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Old 05-25-2016, 02:32 AM   #5
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Stock wiring?
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Old 05-25-2016, 05:14 AM   #6
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Do you have a current meter or clamp? If so run the car like normal then shut it off and see if it shocks you. If it does use the current clamp to see what the current draw is without the engine running.

If no current draw then you have a bad ground loop.

If I am not mistaken it runs from the battery negative to the body near the starter relay. Clean that really well. Next is the big one from the engine black to the firewall. Clean those connections. There should also be one from the body to the frame near the passenger side firewall clean that one as well. Some how the body is getting insulated from the return on the battery. Turning on the headlights and then off might have just pulled the charge off the body so I really don't think that would be where I would start looking. If could have turned the radio it might have done the same thing. Check this site it might help.

How To Troubleshoot Your Electrical System - Mustang Monthly
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Old 05-25-2016, 07:17 AM   #7
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Yes its stock wiring, sorta. Some wires have been replaced as needed and the gauge cluster is all new gauges rewired. But not a painless or other new harness system.


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Old 05-25-2016, 07:30 AM   #8
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Mlarv, I'll start it up and see if I get a shock and try to measure it. I've had this car about 3 years and just realized there was no block to frame ground strap until a few months ago while working on something else.
But it seems like it needs to be storing a charge somewhere like the coil in order to get a shock.


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Old 05-25-2016, 08:04 AM   #9
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Ok. Disconnected the positive battery post and still getting a shock.


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Old 05-25-2016, 08:35 AM   #10
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Pull the starter relay off and see what happens. It may not start but see if still shocks you. After there are no coils or other normal thing that would hold a charge that I know of. I am at work so it may be awhile before I get back on.
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Old 05-25-2016, 08:47 AM   #11
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check key switch......I bet it's not cutting power to run ckt. I see we are in classic stang forum. What year? As already mentioned coils don't hold charge but they are what will boost voltage to a level you can feel.
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Old 05-25-2016, 09:22 AM   #12
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I'll disconnect the starter relay output side and see what happens. I just replaced the relay about 8 months ago. I got to bare metal behind it and put dielectric grease between it and the firewall.
Not sure how long it's been going on, since it obviously doesn't shock when wearing shoes, unless lying on the ground.

It's a 67.


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Old 05-25-2016, 09:47 AM   #13
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check feed to run ckt (ie condensor/distributor)
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Old 05-25-2016, 09:52 AM   #14
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check feed to run ckt (ie condensor/distributor)
It's a new distributor, no points/condensor. It's a Petronix, about 3 months old.
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Old 05-25-2016, 02:38 PM   #15
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Do you have a power probe with the built in volt meter? If you do if start by just probing around and seeing where the power is constant and then follow it back from there.
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Old 05-25-2016, 02:51 PM   #16
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Do you have a power probe with the built in volt meter? If you do if start by just probing around and seeing where the power is constant and then follow it back from there.
I've got one, I'm going to use it after work to see what I can find.
Do you think the lack of a block ground strap could have messed up the starter relay? The relay is only about 8 months old, but I just installed the block ground strap about 2-3 months ago and it's the second time I've installed a relay since getting the car 3 years ago.
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Old 05-25-2016, 03:47 PM   #17
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I actually don't have a block to chassis ground, just batter to ground and one from my battery to the block and don't have any issues that you are dealing with. I think you might have a short in your wiring somewhere. That's allowing constant voltage. Does your battery hold a charge for a while?
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Old 05-25-2016, 04:00 PM   #18
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I actually don't have a block to chassis ground, just batter to ground and one from my battery to the block and don't have any issues that you are dealing with. I think you might have a short in your wiring somewhere. That's allowing constant voltage. Does your battery hold a charge for a while?
My setup was with battery to block and a very small 18 gauge wire to the dash area (which was melting) before I added a block to frame.
If you go battery to frame and battery to block, then you're good.
I was planning on adding a modern fuse block this summer anyway, so I guess I should get on that sooner. That will clean up a lot of crap under the dash and allow for real fuses.
A Previous owner had installed an alarm, which was a real mess also, I removed it because it wasn't done very well.
So the electrical has been a constant fix one thing and another breaks. But I've made tremendous progress, so it's ok.
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Old 05-25-2016, 04:26 PM   #19
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You said you pulled the positive off the battery and still got shocked. I don't think your starter relay is bad, it is just taken away a ground point. If the shock goes away start from there if not go to the one on the block then the next until it goes away.

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Old 05-25-2016, 04:42 PM   #20
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You said you pulled the positive off the battery and still got shocked. I don't think your starter relay is bad, it is just taken away a ground point. If the shock goes away start from there if not go to the one on the block then the next until it goes away.

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I'll get out the power probe and re-apply the positive cable. I'll remove each of the constant 12v wires one at a time a see if it goes away. I just can't imagine what is acting like a capacitor and retaining voltage.
Can the starter act that way if is starting to mess up. I haven't had to touch the starter yet, but it seems to work. Although sometimes it hangs up a bit when the car doesn't start in the morning, you have to wait for it to stop rotating before attempting again. But it always starts up.
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Old 05-25-2016, 04:56 PM   #21
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Quote:
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Ok. Disconnected the positive battery post and still getting a shock.


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Your still getting shocked with the battery unhooked? If you tap it with a screwdriver do you see an arc?


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Old 05-25-2016, 07:08 PM   #22
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Your still getting shocked with the battery unhooked? If you tap it with a screwdriver do you see an arc?


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Tap the Positive post or the starter relay?
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Old 05-25-2016, 10:27 PM   #23
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I have an "updated" wiring harness from americanautowire. Very nice kit, the connectors kinda suck tho hard to connect/disconnect though. I just bought a bunch of waterproof connect. They have two kits available though I think one is just a stock replacement with updated furs block I think and then the one I got has all the relays for he horns, headlights, power windows and electric fans. At Least that's what I remember when buying mine.
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Old 05-26-2016, 11:21 AM   #24
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Quote:
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I have an "updated" wiring harness from americanautowire. Very nice kit, the connectors kinda suck tho hard to connect/disconnect though. I just bought a bunch of waterproof connect. They have two kits available though I think one is just a stock replacement with updated furs block I think and then the one I got has all the relays for he horns, headlights, power windows and electric fans. At Least that's what I remember when buying mine.
Thanks I'll check that one out.
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Old 05-26-2016, 11:27 AM   #25
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I messed with it a little last night. After leaving the battery cable unhooked, there was no shock anymore. I reconnected it and still did not get a shock. Using the Power Probe, I get 12.4V on left side of relay as expected and Ground 0.0 volts on S, I and Starter side, as expected. But when I turn the key to on position (not starting) I get ground light on S with 0.2 volts and ground 0.0 on starter side with 12.4 volts on I.
I started the car, but only ran it for a few minutes with no shock. I'll check it again today after driving home for lunch (20 minute drive).
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