Disconnecting the battery while the engine is running isn't a valid test for alternator function and may damage sensitive electronic parts. Instead, use a common voltmeter and the following test ...
Dear 4-WHEEL & OFF-ROAD: I have a 1978 Chevy Blazer that I plan to do some four-wheeling with and will be adding a custom bumper with a winch. I was thinking I need to upgrade the alternator to handle ...