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> MSD gremlin, can't shut off ignition
Trekkor
post Feb 27 2005, 12:34 AM
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I turn off the key but the engine keeps running.
This is a new problem after adding the MSD.

Key turns off the power, I know, because I can hear the fuel pump turn off.

It eventually shuts off after turning the key off/on/off/on or revving the motor with the key off.

What should I do?
Performance is spectacular, except gremlins are tenants. (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif)

KT
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Trekkor
post Feb 27 2005, 10:38 AM
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Joe, the purple/black wire is the tach wire. It now needs to come off the MSD box and go to the tach directly.

The tach wire in the dash is a better looking prurple/black due to it's being protected from the elements for so long.

For my fuel pump key on power I'm using a wire off the stock relay board with no ground jumper. I use the front/right terminal on the F.I. socket. ( front right being closest to driver and engine ).

Mike, this is a bit odd. Same weekend. (IMG:http://www.914world.com/bbs2/html/emoticons/unsure.gif)
So, which wire gets the diode? The D+ into the relay board or the keyed 12+ power to the MSD which is shown to be the original coil+ wire?

From the diagram on pg 8 of MSD manual it looks like the exciter wire needs to be diode protected so the small amont of voltage will will no longer activate the MSD which has it's own 12v constant power source.

KT
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Posts in this topic
trekkor   MSD gremlin   Feb 27 2005, 12:34 AM
Aaron Cox   t dog i know the answer....i have the hyfire thi...   Feb 27 2005, 12:36 AM
redshift   Sounds like power is getting somewhere later than ...   Feb 27 2005, 12:37 AM
Aaron Cox   yep.... you need the diode! inline....   Feb 27 2005, 12:37 AM
Aaron Cox   install diode/resistor in line with SWITCHED posit...   Feb 27 2005, 12:39 AM
trekkor   What diode? Where me find?...grunt KT   Feb 27 2005, 12:41 AM
Aaron Cox   <...   Feb 27 2005, 12:42 AM
trekkor   When all else fails, read instructions. And, MSD ...   Feb 27 2005, 01:08 AM
trekkor   If anyone has done this *fix*, please guide me thr...   Feb 27 2005, 01:12 AM
Joe Ricard   My Hyfire did this last night. Only it was ANDY i...   Feb 27 2005, 06:31 AM
!   I'm having the same problem,,,,,looks as if th...   Feb 27 2005, 08:34 AM
0396   Mike, I'm not too experience with the electri...   Feb 27 2005, 08:59 AM
!   An internally regulated alternator has three wires...   Feb 27 2005, 09:12 AM
0396   Mike, Thanks for the reponse. I was concern that ...   Feb 27 2005, 09:19 AM
!   An on/off kill switch will work....but the diode w...   Feb 27 2005, 09:21 AM
0396   Mike, Thank you When your in LA , let me know, I...   Feb 27 2005, 09:24 AM
!     Feb 27 2005, 09:28 AM
!   Another comment from the 911 board....Rich Herzog....   Feb 27 2005, 09:30 AM
iamchappy   The easiest place to put it is spliced into the al...   Feb 27 2005, 10:12 AM
!   Since most of the Radio Crap guys are computer gee...   Feb 27 2005, 10:24 AM
trekkor   Joe, the purple/black wire is the tach wire. It no...   Feb 27 2005, 10:38 AM
!   Yeah the D+ wire needs it...."I" need from YOU.......   Feb 27 2005, 10:40 AM
trekkor   Pic coming... Take this. KT   Feb 27 2005, 10:55 AM
trekkor   pic. MSD calls it a "100V/1A diode". KT   Feb 27 2005, 11:01 AM
!   Thanks....   Feb 27 2005, 11:17 AM
trekkor   So can just place the diode in-line before the cha...   Feb 27 2005, 02:57 PM
Aaron Cox   i believe you want the diode inline with the switc...   Feb 27 2005, 02:57 PM
Sparky   Gee or read the manual they actually tell you that...   Feb 27 2005, 03:09 PM
trekkor   the MSD paperwork ( above ) reads differently. KT   Feb 27 2005, 03:09 PM
!   Just did the install....it works...   Feb 27 2005, 04:13 PM
trekkor   Where did you put the diode, Mike, I want to do th...   Feb 27 2005, 04:45 PM
Aaron Cox   <...   Feb 27 2005, 06:39 PM
!   Put it on the D+ lead to the bulb.....had a 50/50 ...   Feb 27 2005, 07:14 PM
trekkor   50/50 HUH? Not so good odds. I NEED the real stor...   Feb 28 2005, 03:13 PM
trekkor   Got it! Crimped on a terminal to each end wit...   Feb 28 2005, 04:08 PM
!   So how come this never went to the classic threads...   Jun 20 2005, 08:57 AM


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