Starter not turning
 

The short story is when I turn the key, the starter does not engage...no clicking, no dimming of lights, nothing.

Long version is, everything was ok UNTIL I TOUCHED SOMETHING. I relocated the battery from the smugglers box back to its original location, and I changed the spark plugs. Car is a 78 SC, turbo. As such, it has EFI, and nothing is anything like it was when it left the factory. 14 pin connector is long gone. I figured maybe I knocked a wire loose; can't find anything. I have battery voltage at the starter. I have continuity from 50 at the switch to the 50 terminal at the starter. I assume the 50 terminal simply provides power to the starter solenoid, and it internally makes a switch to rotate the started motor. I put in a new ignition switch I had lying around; no change.

Can I simply jump out 50 to 30 to test the started solenoid? I am thinking I may have a starter issue. Again, everything was OK, UNTIL I TOUCHED SOMETHING. The last time I engaged the starter, it worked, thankfully. That was last week, leaving the paint shop.
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IMO, yes, you should be able to short the solenoid to see if that engages the starter, I suspect the starter will engage. The next thing I'd do is check the yellow wire that "tells" the solenoid to crank engage and crank the starter. This process starts at the ign. switch, goes thru the 14 pin connector then continues thru to the Solenoid.

You said the 14 pin connector is gone, that may be where the problem is, whatever replaced the yellow wire connection may be what's causing the problem.

BTW, you said you 'touched something', where did that happen?

I also installed EFI on my 74 911 and tied into the 14 pin connector, I'm curious how you replaced yours? just find a new one and swap it over? Thx --

If you have power at the positive side of your starter solenoid and you're not getting any clicking, probably a dead solenoid. The solenoid throws the starter bendix forward which brings it into the field of the hot wire from the battery. If the solenoid isn't moving the starter bendix, the motor won't engage.

'85 Carerra BRAND NEW STARTER! 1 week old! Didnt start today, clicks and thats it. What now?

No such thing as a brand new BOSCH starter for an air cooled 911, they are all remans AFIK. If it clicks, give the solenoid a tap or a whack. Usually that will free it up. Most of the time this happens prior to starting a hot engine.

yes you can jumper power from the battery terminal at the starter to the start wire to test the battery.

when you moved the battery, was it simply a matter of pulling the POS wire to the battery back to the front of the car.
there should be several red wires on the battery terminal. one of those supplies power to the ignition switch for starting.
make sure you have a good ground from the battery to the chassis and from the chassis to the transmission, I assume it is good if it use to start before moving the battery,

check for power at the yellow while cranking. I prefer a test light, just compare brightness to the battery cable at the starter.
continuity does not mean a whole lot. you need very good connections, it takes a lot of current to pull in the solenoid.

do you have an aftermarket car alarm. if so, that could be your issue.