Hi all. Haven't posted in awhile. My 82 300D Turbo is not starting so I have done some testing and have narrowed it down to the starter solenoid I think. Here is what it is doing. I put the key in turn it to the glow plug setting light comes on then goes off I turn it to start and nothing. The started doesn't turn over. But the lights dim. So test the starter by shorting out the two large terminals on the solenoid and it turns fine. here is where I am confused to test if the solenoid is ok or not I tried putting a test light from the positive terminal on the battery to the small screw on the soleniod and the light came on. The thing is I didnt have the key in yet. I thought it was supposed to only come on when you turned the key to start. Thank in advance for any help.