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novaguy71
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Joined: 17 Apr 2011
Posts: 12
Location: millsboro, de
498.06 points



PostPosted: Sat May 21, 2011 11:52 am    Post subject: msd Reply with quote

I have a 6al box with pro comp dist. And some times the engine won't start when the key switch is in the cranking position. It starts when you let go of the key. I have changed the eletrical part of key switch and the msd box is wire just like msd said to.... I have battery in trunk and a ground to the frame and engine block.
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Sat May 21, 2011 2:25 pm    Post subject: Reply with quote

Where do you have the "turn on" wire (small red - maybe 14 ga.) connected? I'm guessing you have it connected to the former coil + wire. If it's causing problems the easiest thing would be to just pick another switched 12v source. About anything should work as the "turn on" wire only pulls in the milliamp range. This may solve your problem. How is cranking speed? I can't remember what the lower voltage range is for the MSD units - hopefully that isn't the problem. Clay
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I have done so much with so little for so long, I can now do anything with nothing.
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bill jones
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Joined: 21 Dec 2003
Posts: 171
Location: Salt Lake City Utah
4414.80 points



PostPosted: Sun May 22, 2011 1:53 am    Post subject: Reply with quote

-If it is an old car like in the mid 1960 thru mid 1970's era I would suspect the ignition switch could be bad.

-I've had several vehicles of that era and each one has had the same exact problem and that was the key switch.

-I have taken apart each of those switches and they all have bad carbon burnt tracks in between the start and the run terminals on the innards of the switch.
----------------------------------------------------
-If you were to disconnect the small red of your 6 box from your keyed supply of power, and temporarily connect a direct 12V source from the battery to that red wire of the 6 box and it still won't start then the problem is NOT the key switch.
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Sun May 22, 2011 2:42 pm    Post subject: Reply with quote

bill jones wrote:

----------------------------------------------------
-If you were to disconnect the small red of your 6 box from your keyed supply of power, and temporarily connect a direct 12V source from the battery to that red wire of the 6 box and it still won't start then the problem is NOT the key switch.


^^^^^^^ Excellent!!!!^^^^^^^^^^

How are you doing Bill? Haven't seen you post much here or on ST.
Adam
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bill jones
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Joined: 21 Dec 2003
Posts: 171
Location: Salt Lake City Utah
4414.80 points



PostPosted: Sun May 22, 2011 5:06 pm    Post subject: Reply with quote

-I just don't find the sort of topics that interest me much these days---I've become more of a machinest than an engine builder over the past 20 years.
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