Hey David==one goes to the light or gauge on the dash and the other one goes to energize the field. Good luckJoe ==new answer== on a delco alternator, one terminal is a feed back that lets the regulator get a look at battery voltage. it should be hooked up to the battery. the other is a a "flash" terminal that starts the alternator charging, and commonly comes off the idiot lite. see the answer to "wiring a one wire alternator".
It is at the rear of the alternator, in the plug that hold the wires that are incerted at the rear.
More than likely they connect to the positive and negative polarities of the power source.
take the belt off the alternator and take out the 3 bolts that hold the alternator to the engine and unplug the wires that plug into it and you have it off.
Richard Gora is also using the older Geo alternator from the 3 cylinder models. This alternator has 3 wires. One is drirectly from the battery and 2 others are (or more correctly were) in a green plug. These are the power from the key and the lead to the "no charge" light. My problem is that I do not have the plug and need to determine which of the two wires goes where. Any help ? Thanks !!! Doc PS I have an ohmeter etc etc firstname.lastname@example.org
If the light remains on then the system still isn't charging as it should. Check the plug on the alternator and also that the wires to the alt have a good connection.
There should be a heavy wire called the Alternator output wire, It carries power from the alternator to power your accessories and to maintain your battery. The smaller wires usually in a plug are either the alternator's voltage sense, Stator/ACurrent/Tachometer output, regulator/indicator light. or if its an Externaly regulated alternator they will be alternator Field, Stator/ACurrent/Tachometer. hope this helps
Power plug. Usually a round black plug with two small wires.
go to the store and get a new plug for your year of car cut the wires hook them up to the same color tape or shrink wrap exposed wire plug into alternator good to go
Ignition switch, coils, starter, alternator, spark plugs. plug wires, battery.
Wires between Alternator and Battery, and between Alternator plug connector and fuse box etc.
The wires in the plug are backwards. switch them around
I assume your talking about the rectangular plug right at the alternator, and that your new Alt came with a short repair harness, the 2 heavy wires are BAT and the slim and likely white one is Tachometer AC sense, likely that 3 of the old ones were Bat test the old connector with a test light to see which of them have power to them.