6G 135 amp Ford. Black or gray with green voltage regulator. Slightly over 5″ inches center to center of thru bolts (see pics). Found commonly on medium duty trucks and E series vans. You know you have a 6G when you see the gray plastic bearing cover in the middle of the back of the alternator. Typical failure behavior is BAT light on-off inadvertently but voltages seem to be normal, or volt meter indicates erratic, short periods of no charge. These symptoms usually occur after 100K miles.
Build your own reman quality alternator with new rectifier ass’y (diodes), new high quality voltage regulator, front bearing, rear bearing, slip ring, tolerance ring and dust cover.
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The parent company : Performance Starter & Alternator, Inc. has been in business since 1985. “Help” is what we’re all about. You don’t have to have any concerns whatsoever that your rebuild may not succeed. If you need help or have a question, e mail us. If you can’t understand the email, call us or leave a voice mail with your name and number. An actual starter alternator rebuilder will call you back.