We have a few of these units and have had to swap out power supply on all of them over the years I sent this to my mechanic who will be onsite tomarow I asked him to see if ours are that way out of curiousity.

That can’t be right. If you hook +5 to -12, besides the damage it would cause, they can’t possibly still read +5 and -12. They will read the same voltage. There is an old US bulletin to help with fluctuations on the 5v supply that says to run a jumper from TV-2 to the unused 5v pin on the power supply, J7 pin 3. And from TV-46 to HB1-4 for common.

I agree we checked and the discription does not seem correct.
Are you using an ip8300 selector or different ?

Are you sure its a 1000?

They are 1000 hydros for sure. And yes I know it sounds crazy. My hunch was that these were sabotage issues. As I said we have other cars that are wire this way and others that are not.. The company that lost this contract has a fellow who is known for diabolical bs like this. I wanted to be sure before I got upset..I’d like to think the world was full of honest good folks but reality shows me we have others among us. I will remove the 12- from the 5+ on the other jobs that have it if your guys are not aware of some strange factory fix for some other issue. It seems wrong to me. Thanks for,your input..🙏🏼

The selector is the interface products model . I’m sorry I don’t remember what the date tag number said

Thank you very much 😀🙏🏼

Thank you

I don’t mean that it sounds crazy or not correct. I mean it is physically impossible to connect +5 and -12 (or any other voltages) together and have them not read the same voltage, they’re at the same potential. I Don’t know what voltage it would be but they can’t be different. You have to be missing something. Take one of the cars that you think has +5 and -12 connected together and put a jumper from +5 to -12 on HB1 pins 2-3 or on one of the J plugs on the Buss Board pins 2-3 and see what happens.

Thanks.. I’ll give t a shot