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Global Mod,
Mod | | | Forums66 Topics128,042 Posts1,055,519 Members48,424 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jul 2007 Posts: 328 'Bolter | | 'Bolter Joined: Jul 2007 Posts: 328 | Just wondering if any one has experience with the
"engine run-on" condition as described in the MSD 6A
manual. This is where the presence of residual voltage after the engine is switched off keeps the engine running.
I have an internally regulated GM alternator and MSD supplies a diode to be installed at the alternator in order to prevent the MSD from being "back-fed" with even minor voltage when you turn off the key...
I'm going to install that diode, but was wondering if anyone else has experience with this....? and, did the little diode do the trick?
Thanks
mike
| | | | | Joined: Oct 2006 Posts: 843 Shop Shark | | Shop Shark Joined: Oct 2006 Posts: 843 | Do as MSD suggests,it'll fix it. | | | | | Joined: Jul 2007 Posts: 328 'Bolter | | 'Bolter Joined: Jul 2007 Posts: 328 | Oh, Yeah!
That little tiny diode fixed the problem.....
took me longer to find it, than it did to put it in!
Thanks BC52
mike
| | | | | Joined: Feb 2007 Posts: 230 Shop Shark | | Shop Shark Joined: Feb 2007 Posts: 230 | Had the same problem on my "62", alternator exciter wire feeding back thru the ignition switch. Diode from Radio Shack on this wire with arrow pointed toward alternator. | | |
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