Hello everyone, I have a 1970 Camaro all roller 355 TH400 3000 stall converter MSD 8630 distributor and MSD blaster SS coil, I had a MSD 8394 e-curve distributor which I replaced (to many problems) with the 8630, but after replacing the distributor the engine will only run with the key in the on position and will die when I release the key in the on position, I've been working on cars for many years and have not run into this, I replaced and adjusted the ignition switch same problem, I've checked with an OHM'S meter from junction box to positive on coil no break i have 12 volts with ignition on to coil positive and good grounds battery to car and car to engine block, I replaced the junction block just because it was worn on the treads. I can get it to run only if i provide a jumper wire from the battery directly to the positive coil but of course i dont want to burn up the coil. Has anyone had this problem and what was the remedy. Thank you

 

With the engine not running, turn the ignition on but don't crank or start it. Put a voltmeter on the + side of the coil and see how many volts it's showing. If it is around 7 to 8 volts that is the factory ballast wire to coil for point ignition.

 

 

First, get Haynes manual for the Camaro as it will have electrical schematics and help troubleshoot.
Don't know about power for 8360 dist, MSD website may help, or instructions supplied with distributor as to whether power is battery or resistance wire supplied.
You do have the yellow wire from starter solenoid R terminal for hot start when cranking an operating temp engine.
The reduced voltage is by design keeping the current lower preventing coil overheat with a point set distributor.
If 8360 dist needs full battery power under normal conditions, you will have to run a new 12 AWG wire from the fuse panel IGN spade to coil and tie back the OE ign supply wire.

 

Thank you for your response sorry but I have had to take care of some personal business. I have key on non crank 11.74 volts at the coil. I will jump the starter wire to the fuse box I will let you know.

 

Are you running an MSD box?

 

I was running a MSD 6A but have since taken it off. Currently have MSD 8630 distributor and MSD Blaster SS which both are brand new.

 

I ordered a by pass wire from American Autowire part #500997 which is connected to the "S" on the mini starter solenoid and to the + positive on the ignition coil, the by pass wire has a one-way diode which sends power to the coil only on start up.