Ignition switch questions

[JPM]

I have a question for the forum. What do the Terminals P and R stand for on the ignition switch. I want to switch the yellow wire for my radio to permanent voltage from switched. It is currently on one terminal 30. I read in another post that the radio should be connected via the ignition lock (Term 15 for switched or Term 30 for permanent voltage). Unfortunately that does not jive with mine.

I have a relatively recent 80's model switch(as others have noted a PITA to remove due to interference with the heater control cables), which was retrofitted by a mechanic on a '69 911T. According to his notes he had to update the wiring but gave no details. The wiring diagram for my year car does not help as it shows a radio connection at Terminal 75. I installed a new electrical portion of the switch from Pelican hoping to get the ACC function to work but no luck.

With a screwdriver blade I get RUN and START only on the electric portion. On the mechanical side with the key in there is a stop before RUN but no power to any accessories like the radio. You can see my electric socket terminals contain clockwise: T50, two T15, R, two T30, two X, T30 and P(both empty i.e. no wires). I cant see where else to connect the radio terminal to get continous power.
Also, any clues on the ACC position.

Thanks for any insight.
JP

[Bob Kontak]

R is the radio contact on my 81SC
P is for the parking light contact that ties into the headlight switch.

If you want continuous power for the radio you may have to tap into a hot all the time circuit (apart from the switch).

[JPM]

Actually, I would like to switch the radio on and off from the accessory position(if I have one) like on other cars.
I kind of suspected R was for radio, but then what is a big red lead doing there which looks like the power supply leads direct from the battery(Terminal 30 according to my diagram). The only thing that coincides is the big yellow wire at terminal 50.

JP

[Bob Kontak]

Let's think about this. You have an old car with a newer switch and an old car with "updated" wires. Colors may be different, yadda yadda.

However, the basic components that receive juice through the starter switch in acc/on/start are going to be the same between a 69 and an 81. That makes sense to me at least.

How about I wade through the SC diagram and tell you what is fed by each one of the terminal indicators. If I do that, can you get a multi-meter, some test wire with alligator clips and find where each one of your seven wires terminate - given you will know where the end component will be? Test lead on a single wire (removed from switch) and touch to the termination point using the audible continuity mode on the multi-meter?

There are probably a squillion ign switch diagrams buried in this forum so if you are able to do some grunt work and find where your wires go, I can feed you info.

[JPM]

Thanks, that would help. I have eight wires connected to the socket(there is a hidden yellow wire in my one picture, sorry for that, shown at right in the dangling photo). 5 wires come from/go to the 6 pole connector in the firewall, two wires go to the steering switch and one wire goes to the radio, so we know the end point of those three.

If you could tell me what is fed by the terminals in your diagram maybe there will be some analogy in function/wire color. I don't quite follow your test procedure. I assume it is continuity tests with power off and working the switch with the key or with a screwdriver blade in the electrical portion only? The only readily available component to test is the radio. Are you saying remove the radio pin from switch and test continuity between it and the other terminal points going through acc/on/start positions on the switch?

[Bob Kontak]

Originally Posted by JPM

Are you saying remove the radio pin from switch and test continuity between it and the other terminal points going through acc/on/start positions on the switch?

I am saying confirm that you know where EVERY single wire terminates in the cluster of wires that feed into the ignition switch.

You noted the wiring has been updated. I don't know what was updated. Neither do you.

Take every wire when disconnected from the starter switch and confirm with extreme prejudice where it terminates. Then you have to mark them as to end point. The end point will tell you based on the info I can find where it plugs into the ignition switch.

So if you agree to do that I will get you the info.

[JPM]

I will get back with what results I can find. Not sure where the fuel pump wires are connected to the harness as it has been relocated under the rear torsion bar and I can barely get under there.

[Bob Kontak]

Originally Posted by JPM

I will get back with what results I can find. Not sure where the fuel pump wires are connected to the harness as it has been relocated under the rear torsion bar and I can barely get under there.

If you commit to doing what you can, I will do the leg work on info. Not trying to be a wiener, but there is a time investment.

Hey, you know what a torsion bar is, sounds good enough for me. Not tonight, tomorrow.

Multi-meter?

[gerakroo]

Maybe this helps ?

We are just working our own new connection diagrams for the SC model.



(i can send a clearer picture by email)

The 69 model main harness has the following wires going to the 6 female connector)



Red (from fusebox) (1)
Red (from fusebox) (6)
Yellow/red (blower/heater)
Blue/yellow (positive loop dashboard)
Blue/white (dashboard, the loop between direction light indicators)
Yellow (starter)

If you need more info, just contact us at info@kroonwireharnesses.com

[JPM]

Thanks over there in Holland. My blue/white wire goes directly to the dashboard from the 6 pole connector. Also instead of the blue/yellow, I have an extra red. It looks like two of my reds are doubled up on one connection(from fusebox maybe). I will look at it closer later today.

JP

[JPM]

Yes, I have a multi-meter to do continuity tests, but today is good to go boating!

JP

[Bob Kontak]

Originally Posted by JPM

Yes, I have a multi-meter to do continuity tests, but today is good to go boating!

Nice on the boating.

This is what I pulled from the 82 SC diagrams.

Terminal 30 on ignition

1 of 3: To terminal 30 on the light switch

2 of 3: Positive terminal on battery

2 of 3: Positive terminal on battery

Terminal 50 on ignition: To terminal 50 on starter (solenoid)

Terminal 15 in ignition

1 of 2: To fuse for rear window defogger

2 of 2: To terminal that feeds cluster of wires for instrument gauges.

Terminal R: To radio

Terminal P: To parking light contact terminal P. I am assuming this is one of the terminals on the main light swith.

Terminal X on ignition

1 of 2: Fuse for outside mirrors, window defogger switch (positive terminal) and fresh air blower.

2 of 2: Terminal 75 on light switch.

[JPM]

I do believe I have it figured out. Was able to identify the end component by continuity tests on on three reds and one yellow/red stripe on the ignition switch. This is what I ended up with.

Terminal 50 (yellow) on ignition: To Starter (left it as such since it worked before).

Terminal 15:
(1) Red: To wiper motor
(2) Red: To fuel pump

R: To radio

Terminal 30:
(1) Red: To positive battery terminal
(2) Red/wh: To light switch on steering column
(3) Empty

Terminal X:
(1) Yellow/red: To blower/heater control
(2) Grey: To light switch on steering column

I now have radio power on accessory, fuel pump and gauge lights on run and starter actuation on start. Wiper operates normally.

Thanks for your help, Bob, I couldn't have done it wihout you.

[Bob Kontak]

Cool beans. Enjoy.