I have had the starter out of my 93 GW and it had only one large terminal for the 12V primary connection. I have an extra starter that looks the same in every regard except- it has two terminals. The second one appears to be a ground connection.
Anyone know what this is about? Are they directly interchangable? Are they from a different vintage 1500?
You should be able to tell the power connection because it will have fiber washers and insulators to keep the power wire from shorting to the casing. A ground connection will be directly connected to the case.
I called into the wingnut a couple of weeks ago and he was pulling a gl1500 starter. Far as I remember there wasonly one connection.
Try verifying the connections. Remove the battery completely. Using x1 ohms scale place 1 lead on the known power connector. Place the other on a good ground. You should get high resistance. Now try it on the second unknown terminal what is your reading?
In industry some of these motors are dual voltage 12- 24 and you can tie into the other connector, but you must verify what you have. Some manufacturers made a mistake and just leave the added connector. As its is costlier to remove so they simply left things alone.
In some cases your only choice is to remove and open the case up and see where the bolts goes.
I'd venture that the 2 terminal starter is from a bike with reverse, while the one terminal starter is for a bike that has no reverse...
I can NOT speak for all years of the 1500, but the reverse speed regulation is in the circuit between the starter and ground. When the starter is used to "START" the "B" solenoid switches this negative lead from the starter direct to ground. When used for reverse, the "B" solenoid does NOT switch at all leaving the Reverse Speed control to run the second starter lead to ground through the Reverse Resistor and a relay that's controlled by the speed circuit. (the "A" solenoid switches direct to the Battery +12v in both cases)