One wire, going to the solenoid, comes from the ignition switch (to start the vehicle).
One is a hot wire connection (on all the time). You can use this to hook up an accessory or to hook up things that might need constant power available. I have my horn hooked up generally, so that it has power even if the ignition is off.
The third (and largest connector) is also a hot wire connection. This large connector can be removed from the solenoid stud and put on the new solenoid. I think this wire goes to the ammeter or alternator, I don't recall.
The two prongs (studs I think you mean) are interchangeable. Just like a light switch, up doesn't have to be on (if you reverse the wires). The small wire connections are not interchangeable and one will usually be marked "S" or "I" (starter or ignition wire). The other may or may not be marked.
Last edited by jp-; 05-30-2007 at 11:59 AM.
61 II 109" Pickup (Restomod, 350 small block, TR4050)
66 IIA 88" Station Wagon (sold)
66 IIA 109" Pickup (Restomod, 5MGE, R380)
67 IIA 109" NADA Wagon (sold)
88, 2.5TD 110 RHD non-hicap pickup
-I used to know everything there was to know about Land Rovers; then I joined the RN Bulletin Board.