348 Quick Voltage Check - Connector 115 Pin 2 ?

Wade- my car is '94, but if you find that the pins carry over to the different years/connectors I'll be happy to get you a reading.

 

Give it to Ernie, he'll do it, he'll do anything.

 

He'd strip the speedometer out of the car in the name of weight reduction.

 

Ok, I have an early (July '89) car with the 9 pins. With no key in the ignition and everything else off I got 0 volts on all pins EXCEPT the middle pin on the bottom row (which is the one I think you are looking for) which gave me a reading of 12.4 volts. Hope this helps. Great thread by the way. Good luck!

 

Ok, here is a drawing of my plug with the corresponding numbers (from the female plug). I was getting voltage from what appears to me to be pin number 8. Kind of backwards the way they have the plug numbered. Also, my top is where the larger indexing slot is on the plug if that helps. Given what you have said it appears my plug is 45 degrees CC from yours. Tried the camera but couldn't get a good shot. Let me know if you need more.

Joe
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That's the way my socket is installed. It makes sense when you consider that the pin numbers on the socket attached to the car go from left to right and top to bottom. What's odd is that I got zero volts on any of those pins with the battery on and the key switch off. Non-functioning speedometer aside, my car is in generally very good shape so there's no reason to suspect a wiring problem. Which is obviously no guaranty that there isn't one...

 

Well I went out and double checked my plug again and the numbering is as I indicated above on my drawing. As mentioned they came from the female plug because I can not make out numbers inside the male attached to the frame. Now, I hope I haven't mislead you because I am still getting a reading on number 8 from my fancy, expensive digital mm but I went and pulled out my trusty 40 year old analogue meter and got nothing on any of the pins. This AM when I did the read I got a steady 12.4 with the digital and 0's on all the others while now I continue to get the 0's on all but a random reading on my number 8. If I was to bet on this I would go with old trusty and say it is 0 on all the pins. I really don't want to mess the good work you guys are doing on this project. Hope this clarifies and corrects what I have posted before.

 

Joe, super nice of you to go to the trouble and contribute to the knowledge base. More data points are better since we can't be 100% certain that my wiring is behaving as it should. Thanks for helping.

Wade, the fact that there's not a wire shown to be connected to Pin 8 is no assurance that there isn't one. As far as I can tell there's a speedometer connector wire missing from the factory diagram, so it's certainly conceivable that other parts of the diagram are not exactly correct.

 

Take lots of pics!

 

That is awesome, Wade! Thanks for doing that.

And, just as you said, so much for RTFM, since at least one of those wires is not shown.

Make sure to link this to the Epic Speedometer Thread, since it will be of use to anyone chasing speedo wiring issues (like that would ever happen ).

 

Remaining Pins of Connector 115:

Pin 8 (White, thick) - to Starter Motor Solenoid (Page L22)

Pin 9 (Green/Black) (Page L29): Min/Max AC Press. SW --- Connector A (fuse box) --- Connector D (fuse box), branch to ECU 1-4 --- Connector 118, branch to ECU 5-8 --- Connector 115 Pin 9 --- Compressor Clutch.