Electrical Instructions for Replacing the Alternator with a GM Alternator in a GT6
by David Wm Wrage, wrage@frognet.net
New parts: 1 GM alternator (55 Amp Unit), 1 GM Alternator 2-Wire plug replacement end, 1 Crimp-on connector, Heat shrink tubing, 1 inch metal tube spacer, 53" fan belt to replace existing belt.
Overall cost: $50.00 including new bolts, belt, alternator, washers, connectors, & plug. Sure beat the heck out of a new/rebuilt cost of a Lucas Alternator with a lesser output.
Labor: Actually, it wasn't that hard. Maybe about 1/2 hour to 1 hour, depending on skill level.
- Step 1: Unhook positive cable from battery.
- Step 2: Unplug wires from alternator.
- Step 3: Remove Lucas alternator from brackets/mounts on engine.
- Step 4: Move upper swing arm bracket to a new location at the bottom front of the engine.
- Step 5: Trim old plug off of wire & slip on heat shrink tubing.
- Step 6: Crimp on post connector to largest of Brown wires (The one going to the Starter/Battery)
- Step 7: Splice the brown/yellow wire to the terminal 1 wire on the replacement GM plug.
- Step 8: Splice the remaining brown wire to the terminal 2 wire on the replacement GM plug.
- Step 9: Heat up the heat-shrink tubing and seal the wires.
- Step 10: Mount Alternator in place. You will need to use a 1 inch spacer block/tube on the swing arm bracket, this will necessitate a new bolt to mount it. Don't forget the belt.
- Connect the crimped connector to the (+) positive mount on the alternator and plug in the GM plug into the alternator.
- See pictures below for additional info. Unfortunately the replacement plug came with 2 white wires.
- Double check wiring, the re-attach battery cable.
- Enjoy the alternator's output.
David Wm Wrage
1972 Triumph GT6 Mk III
wrage@frognet.net
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