Sportomatic Control Valve - electrical question

[DJRporsche]

Hi everyone,

I have been going through several checks to fix my 72 911T sporto. I am running down to only a few last checks.

While doing these checks I came across a picture of a sportomatic control valve that has the Bosch solenoid (same unit in my car). At the electrical connections for the solenoid attached to the control valve there are two male pins (one for ground and the other for positive). These male connections are where one connects the micro-switch to the solenoid.

My question is about the small round black colored "fuse" or resistor like connection/wire between both male pin connections on the solenoid. The control valve on my car does not have this small black colored connection (wire) and seems to have broken off. Is that black colored device necessary to operate the control valve solenoid? If so, does any one know the specifications or a way to replace it. I can easily solder one, but dont want to put the incorrect type. Any help is greatly appreciated.

Doug.

[Scott Douglas]

Here's a picture of what is being talked about in the original post.

If I had to guess, I'd say it's a diode, but I'm far from being an electrical expert.



I checked with my friend, Bob A. who is an electrical wizzard, and he says it most likely is a diode or a 'transzorb' spark-suppressor.
I think you'll be able to run your solenoid without it, but, you may hear a clicking in the radio when the solenoid is actuated.

Thank you mod's for cleaning up the thread. =;>)