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Old 12-03-2017, 08:14 PM   #1
Fbks_Cruiser
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Join Date: Apr 2016
Location: Fairbanks, AK
Posts: 336
Upgraded alternator and installed headlight relays

What a difference! I upgraded to an internally regulated 12SI 94 amp alternator and redid the wiring using Vettevet’s diagram. I used a Seadog marine grade buss bar mounted to the core support by the left headlights. Works great and is easy to access or inspect. From left to right are: fusible link to power for cab (that’s why it is black and seems small), black/ white wire for ammeter, high beam headlight power, low beam headlight power, charge wire to battery, alternator sensing wire and alternator charge wire. You can see the 2 headlight relays in the bottom left corner of the pic. The relays have built in fuse holders, we’ll see how they work out. All new 14g wire from the relays to the headlights. Used the original headlight wires to switch the relays.
Prior to the upgrade, at idle at a stop light, if I had lights on and heater going, voltage would drop to 11.8v. Now, it only goes down to 13.7 or so.
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1972 GMC K2500 Super Custom

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Last edited by Fbks_Cruiser; 12-03-2017 at 08:32 PM.
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