What is the difference between a one wire and two wire alternator?

If it had a one wire, it would be warming up on battery power. Also terminal 2 is a remote voltage sensor for the internal regulator. It tells the alternator what voltage it needs to produce to keep 14 volts at the ignition switch, instead of maintaining 14 volts at the alternator.

Can I use a 1 wire alternator?

YES, especially when using a one-wire alternator. Changing the pulley ratio of the alternator by slowing it down will generally keep the one wire regulator from cutting on . This may also produce a low voltage problem at engine idle speed, depending on the amount of reduction.

What does R mean on an alternator?

A key to help identify alternator terminals. R = Relay - Output to charge relays, etc.

Can I drive with a bad alternator?

If the alternator is going or has gone bad, in most cases the vehicle can be driven for a short distance and for a short period of time, allowing you to make it to a service station or automotive parts store for a replacement alternator.