Re: 1968 no start when lights on
Do the lights dim greatly when trying to crank the starter?
Is battery up to charge?
Is fan belt tight?
How old is the battery?
What is the CCA's of the battery?
Is the original design of alternator/voltage regulator installed?
If lights dim, then not enough power from battery.
Either battery is too low on charge due to loose belt, or regulator set alittle too low coupled with not enough drive time above 2000 rpm.
If too small of battery, 400 CCA's or less and a fully charged battery, battery does not have enough power to supply the current demand.
Another factor is battery cable wire size - min cable/wire size is 1 AWG with molded clamps - no clamp-on clamps.
Also include clean battery terminals, both ends, AND terminals at alt BATT stud and the horn relay buss bar and at the battery junction block next to the battery.
Wire brushing these items help.
If you have the OE design voltage regulator, you may want to change it out to an electronic regulator, P/N Wells VR715, as this will help in keeping battery charged at lower rpm's - don't forget in adding the ground strap from the original VR.
Be sure to change the alt belt at the same time.
A troubleshooting idea, leave battery charger on battery overnight.
Remove charger just before starting, then start with lights on
If she starts, low charged battery (loose belt, dirty connections, not enough drive time) or too old of battery not keeping a charge or a new battery with a bad cell, too small of cable gauge.
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