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Discussion Starter #1
I am rewiring some of the spaghetti that the previous owner was so kind to splice together with electrical tape. I am trying to find a switched ign source for the MSD and fuel pump relay. There is a spade on the fuse block that is marked IGN and probing with a voltmeter says:
Key off - 0
Key on - 12.45v
Key start - 12.38v
Key acc - 6.38v

This looks like the wire i want, because I want power even while cranking. I'm concerned by the 6 volts while the key is in the accessory position. Why would this be? I would NOT be suprised to find something wired incorrectly, it looks like a monkey took apart my dash before and wired things up. Should I ever turn the key to acc, what will happen if i send 6 volts to my MSD and to the relay? Will they burn up? Any suggestions to fix this, or find another switched 12 source, I'd really apprectiate it!

chris
 

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Thats the terminal I used for my MSD 6AL. I think the 6 Volts prevent the regular coil from burning up when the car sits with IGN in ACC (no issue with the MSD since the coil is triggered through the box now)... The MSD can handle up to 18 Volts, as far as I remember, and needs a minumum of 6 Volts...

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71 Monte 454 HO
86 Monte 383
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Not aware that the switch drops 6 volts but I don't know everything. Try removing the fuse and remeasuring the fuse clips. Guessing that the input fuse clip, from the ignition switch, will drop to 0 in ACC.
 

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Discussion Starter #4
Thanks guys. I hooked it up to the IGN terminal. FULMNTE, does your IGN terminal read 6 volts when the key is in ACC? John, I'm gonna go get the multimeter right now, I'll pull that fuse. Thanks again!

chris
 
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