Per Tim's post, several things come to mind. If it does not need a ballast if running 6V:
1. Maybe a ballast reduces the point volts too much. Weak spark. On 12V it reduces about 25%-30%. on 6V that would be 4-4.5V to coil/points.
2. Hooking up the test wire is even more important now if no. 1 is true. What is holding this test up?
I agree about the PO. Everything needs redone or rechecked. Don't trust any wiring.
Check to see if coil says 12V or 6V on it. Check a bulb or two. Read the tech tip and look for signs of upgrade to 12V. See if gen is 6V.
PO almost HAD to be converting to 12V to add a ballast. Considering Tim's comment on not used, not needed for 6V systems. Not a GMC thing?
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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