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toolboxchev · 07-07-2018, 12:48 PM

The other problem is they do not like too much voltage either. If you have an older style alternator with an external regulator they can produce in excess of 14 volts when the battery is drained.

GM updated the alternators when the HEI came out so use something newer that has an internal regulator and keeps voltages below 14.5.

Someone else could chime in and verify this.

07-07-2018, 12:48 PM	#4
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: My kingdom! My kingdom! My kingdom for an HEI module that will last The other problem is they do not like too much voltage either. If you have an older style alternator with an external regulator they can produce in excess of 14 volts when the battery is drained. GM updated the alternators when the HEI came out so use something newer that has an internal regulator and keeps voltages below 14.5. Someone else could chime in and verify this.