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Twilightoptics Hardcore (12sec Club)
Joined: 13 Jan 2004 Posts: 9191 Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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Posted: Wed Jan 21, 2004 3:10 pm Post subject: MSD box not grounded, car runs? |
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Was thinking about my MSD box today, and reliazed that the last time I reconnected the battery, I didn't put the ground for the MSD box on.
But my car still runs, and pretty strong. Reconnected it and didn't notice any difference.
Is the box itself self grounding through the screws into the firewall????
WEIRD.
_________________ A redline a day keeps the carbon away! |
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90RSrocks Member
Joined: 10 Jan 2004 Posts: 421 Location: Klamath Falls, Oregon
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Posted: Wed Jan 21, 2004 3:44 pm Post subject: |
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It was grounded through your tounge. I told you not to lick it man, but do ya listen to me? nooo.
Actually, I'm not sure what happened there. It should have created problems if it wasn't grounded, so it almost has to be grounded somehow. |
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PonchoTA Member
Joined: 13 Jan 2004 Posts: 342 Location: Halfway between Malibu and Santa Barbara!
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Posted: Wed Jan 21, 2004 6:02 pm Post subject: Re: MSD box not grounded, car runs? |
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Twilightoptics wrote: | ... Is the box itself self grounding through the screws into the firewall???? |
Yes. That's what is happening. Most of the "black wire" grounds are pretty superfluous, but it will assure you of a good ground in case the screws loosen, or there is too much dirt/grease in between the box and the fender/firewall/whatever.
All the test equipment I design/build have redundant grounds, especially the high voltage (20kV - 30 kV) stuff.
hth
Paul |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Wed Jan 21, 2004 6:51 pm Post subject: |
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You have that grounded to your battery paul? Usually thats a good idea but with the msd box it really should be grounded to the motor. Spark energy is returning to the msd, at least some of it. |
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Twilightoptics Hardcore (12sec Club)
Joined: 13 Jan 2004 Posts: 9191 Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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Posted: Thu Jan 22, 2004 11:02 am Post subject: |
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Would the big ground battery lead that goes to the motor be a better ground for it? They'd still be touching each other... IE motor has big wire to battery ground, ground wire on battery?
Is the positive on the battery okay?
I just followed the MSD instructions when I installed it |
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Demon 12sec Club
Joined: 09 Jan 2004 Posts: 1189 Location: You're not worthy
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Posted: Thu Jan 22, 2004 12:22 pm Post subject: |
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just attach it to the ground strap area on the block, or some other bolt if it suits you |
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