MSD Pro billet distributor, problems

[camoit]

Look in the wiring manual. It's only a diode like 1 watt. You can get them from Rat Shack $0.12 Solder it in and cover with heat shrink The GM alternator can back feed.

I'm sorry to say when it comes to the MSD on the 4.3L V6 Chevy I have been going through a serous learning curve. I also found out that reluctor can be off by up to 4 degrees between cylinders. There is a company out there that does fix all the MSD screw ups. I'll get the name for you. There back east some where. But we are stuck with MSD or Mallory. Crane does not do the V6 there the trick set up.

OH one more thing. You need to move the pick up wires away from all other wires.... They will pick up EMF interference and cause cross firing. If that does not work then you can try shielded wire with a ground drain. Then you need to use the correct timing light. NAPA auto has them for about 60 bucks. It is compatible with the multi spark.
Next what color springs and stop bushing are you using? If the engine is stock you don't want more then 32 deg of total advance at 3000 RPM. Use the lightest spring for the advance curve if you have changed the cam.