Delco Alternator Question-THE SCOOP
Here is the scoop from a street rodder that has done literally hundreds of these conversions...
The one wire alternators just don't live that long.
If you want to convert the GM 10-SI, 12-SI, and like internally regulated, alternating generators to use on your vehicles, you will need a couple of things.
First off, you will need a 12ga. or 14ga. fusible link or fuse wire.
Secondly, you will need a 12 volt light fixture that has a controlled ground. (Has two wires, and doesn't ground through the housing or bracket)
Third, A GM Style, two wire alternator plug that connects to the side of the alternator.
Connect a 10Ga. wire to the large insulated terminal on the back of the alternator marked 'BATT'.
Connect that wire to the fusible link.
Connect the fusible link to the battery cable side of the starter solenoid.
Your battery side hook up is complete.
Find a wire that is only hot while the Ignition switch is in the 'RUN' position. (This circuit must be 'off' when the key is turned off.)
Connect to that wire with two leads...
The first, about 16 to 18 Ga. wire, travels through the 'Idiot' light, and then to #'1' terminal on the alternator plug.
The second, about a 14 Ga. wire, travels straight from the switched source to the #'2' terminal on the alternator plug.
Plug in the Alternator, and see if it charges.
LED style lights will NOT work. It needs to be a regular automotive style bulb. Small dash style bulbs are perfect.
You must have a light socket that controls the ground, as when the alternator is charging, there is 12 volts positive to BOTH sides of the light.
Almost any automotive parts store will have the parts described above.
DO NOT EXCLUDE THE FUSIBLE LINK! If you don't fuse the system, you stand a very good chance of a fire!
If you have a GM vehicle, and the battery and alternator both test good, but it still will not charge, Check these two things...
1. Check the idiot light. The system won't charge if it is burned out or missing.
2. Check the fusible link. The fusible link is a soft wire with a plastic collar about 4 or 5 inches from the end.
(Plastic collar is about 1 inch long X 1/2 inch dia.) The fusible link is usually found connected to the battery cable terminal side of the starter solenoid.