Wire Connections At Starter On 91TR(US)

Not sure, but I believe that in the past some cars had starting problems caused by low power at the starter, so an extra solenoid was added to bypass the "system" and provided a full battery power to the starter. My TR had this done by a previous owner. I've never had any starting problems so I've left it on the car....although I did relocate it out of sight. I wonder if your car had a similar problem in the past? Or it could be as you say....part of an anti-theft system. I'll try and find a pic of the wiring. Hopefully someone else will chime in and be able to answer your questions.

 

Shamile -- the connections at the TR starter solenoid are:

Terminal 50: white wire. This is the line from the ignition key switch that (theoretically) goes +12V when you put the key in the "start" position (although it's often somewhat lower, +8V~+10V, due to the switch contacts, long wire lengths, connections at the fusepanel, etc.)

Terminal 15A: white/blue wire. This line should go +12V when the plunger inside the starter solenoid moves (which closes the internal switch and also puts +12V power on the starter motor). It's used to "tell" the injection/ignition system that the engine is cranking over/trying to start.

Terminal 30: This is the threaded stud that has a huge wire from the battery and a huge wire going to the alternator output (so it's always +12V). It will also have a small yellow/red wire that goes to supply +12V power to the injection system.

(If you've got additional unused terminals on the starter solenoid it was probably replaced with a quasi-equivalent at some time.)

Like carguy noted, a relay is sometimes added so that, rather than using the wimpy 8~10V coming down the white wire to energize the solenoid, the (wimpy) white wire voltage is used to close the relay which then more directly puts (a stronger) +12V on terminal 50 of the starter solenoid.

Do a search at the old site on "TR solenoid" (and mode, whole words only) -- plenty of homework for you .