Odometer stopped working after I trimmed some wires
 

I have a 1975 911 that has a 964 engine and 993 G50 six-speed trans shoehorned into it.

When I bought my car both the electronic speedo and odometer were working fine. I tried to clean up some of the underhood wiring mess and cut some wires I believed to be connected to an aftermarket stereo. Since that night the speedo still works but the odometer does not.

I am assuming I cut a wire related to the odometer but I just assumed the speedo and odometer worked off the same wire(s). Apparently not.

Does anyone have any insight into what may have happened or have a schematic of the wiring for an electronic speedometer (I assume it is a 1996 speedo) that would work with my 993 G50 trans?

All help is greatly appreciated. Thanks.

I' thinking it is just happenstance that your odometer gear inside the speedo failed. As fas as I know there is no wiring dedicated to the odometer. I could be wrong, but I don't think I am.

I think it is just a bit too coincidental it happened the same day. Plus, I think my speedo is out of a newer 1996 model since it works with the 1996 G50 trans. Does anyone happen to know if there are 2 different wiring circuits for the odometer and speedometer.

Rather than guess at all of this, take a look at the part number on the speedo and figure out what year it's from. Then have a look at a wiring diagram for that year.

I've never seen a speedo with separate wires to the odometer, but at least you'll know for sure.

JR

You could also trace the wires from the back of the speedo to confirm they are still connected or cut.

Or, if possible, borrow a '96 speedo that you know is working and plug it in to test.

Either way, you will find the root cause.

Good suggestions. I will try those.