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> Need help .. Stuck on this darn MSD box
mb911
post Sep 15 2019, 06:11 PM
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So here is the deal.. Customer car has 4cyl with points and MSD box.
I remove the 4 cyl and put a -6 engine with pertronix in it. I re connect one of the cut wires from the msd box and do a resistance test.. All is good.. Engine runs funky with the MSD connected so I decide to run it with just the pertronix and disconnect the msd.. Engine runs great.. The harness was made by Perry and double checked everything and dont see any issues.. Also note the tach with the msd tach adapt is not accurate so assuming it is running 4cyl signal still?

Any idea's?
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sixnotfour
post Sep 16 2019, 04:33 PM
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I dont think its a pertronix problem, its the bundled wiring..add some leads like the directions above,,all mine are that way no problem..
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mb911   Need help .. Stuck on this darn MSD box   Sep 15 2019, 06:11 PM
sportlicherFahrer   Which pertronix is it? (1,2, or 3) Is the MSD box...   Sep 15 2019, 06:25 PM
mb911   Which pertronix is it? (1,2, or 3) Is the MSD bo...   Sep 15 2019, 06:37 PM
sixnotfour   MSD Digital 6A and 6AL Ignition Control 6A - PN 62...   Sep 15 2019, 06:37 PM
mb911   @sixnotfour I am with you on this but I resoldere...   Sep 15 2019, 06:44 PM
sportlicherFahrer   What tach is being used? Does it read correctly wi...   Sep 15 2019, 06:51 PM
mb911   Its. 4cyl tach currently. Could that be the issue...   Sep 15 2019, 06:58 PM
mb911   Oh and no does not read correctly but could not te...   Sep 15 2019, 06:58 PM
orthobiz   I took out a Pertronix I recently and the little b...   Sep 15 2019, 07:01 PM
mb911   I took out a Pertronix I recently and the little ...   Sep 15 2019, 07:04 PM
orthobiz   It's the little induction box thing that mount...   Sep 15 2019, 07:20 PM
sportlicherFahrer   What plug wires are on the engine? MSD is incompat...   Sep 15 2019, 07:09 PM
mb911   What plug wires are on the engine? MSD is incompa...   Sep 15 2019, 07:11 PM
sportlicherFahrer   How is it all wired up? Should look something lik...   Sep 15 2019, 07:16 PM
mb911   How is it all wired up? Should look something li...   Sep 15 2019, 07:17 PM
sportlicherFahrer   I'd try it with the tach adapter wiring comple...   Sep 15 2019, 07:23 PM
mb911   Sounds like a good plan.. And yes matching color f...   Sep 15 2019, 07:27 PM
sportlicherFahrer   Also check and see if the rotor has a resistor in ...   Sep 15 2019, 07:40 PM
Retroracer   Ben - couple of things to try: 1) maybe the Petro...   Sep 15 2019, 07:47 PM
mb911   I will check all those things.. Wiring is all new ...   Sep 15 2019, 07:53 PM
mb911   Called MSD this morning.. They feel I should isola...   Sep 16 2019, 07:28 AM
sportlicherFahrer   It would be interesting to see if that makes a dif...   Sep 16 2019, 07:33 AM
mb911   It would be interesting to see if that makes a di...   Sep 16 2019, 07:58 AM
Retroracer   ..kind of what I was suggesting? Temporarily take...   Sep 16 2019, 08:55 AM
mb911   I suppose it is. I will report back.   Sep 16 2019, 04:26 PM
sixnotfour   I dont think its a pertronix problem, its the bund...   Sep 16 2019, 04:33 PM
mb911   So made home runs with the MSD harness and everyth...   Sep 23 2019, 04:22 PM
sportlicherFahrer   Sounds like it was interference from having them a...   Sep 23 2019, 04:26 PM
sixnotfour   :beer2: :first:   Sep 23 2019, 04:26 PM
mb911   I guess so.. Probably is to make it look nice now.   Sep 23 2019, 06:52 PM
sportlicherFahrer   That's the fun part! :D :beer2:   Sep 23 2019, 07:09 PM
Retroracer   Good to know you got to root cause though. - Tony   Sep 23 2019, 07:49 PM


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