Join Date: Dec 2002
Location: Saint Louis, Missouri
I would check the wire like John_Muha described. Even if you're not the best at trouble shooting electrical, I would pick up a basic meter to use on the car or at the house as they are not always needed but they do come in handy now and then.
Just to add what John_Muha said, if the alternator does have a small 2 wire plug on the back outside edge of the alternator, have the car running and when the gauge reads hi at 14 volts, then unplug the 2 wire plug on the alternator and this should make the alternator go dead and not be charging and see if the voltage goes down to the lower value you had when you hit a bump. If it does and the alternator is still under warranty, I would maybe try swap that first. If it still acts up then I would also think that the 12volt ignition wire in that 2 wire plug is going dead now and then after you hit a bump.
I remember helping another person on this site with an ignition switch problem and even the "new" ignition switch after a few uses went bad and I told him if it acts up again to try a different source as they may have a run of bad ones.
Electrical problems can be a pain, but keep track of what you are doing and it can be corrected.
I also do not know what wire in the 2 wire plug does what but one does go to an ignition 12v source and I think the other goes to the "GEN" light in the dash but you may want to get a wiring diagram to help out.
1974 Spirit Of America Nova (being restored), 1973 Nova Custom, 1968 Chevy II (Garage Find 2012)
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