Something is fubar with my new gauges

[Verdugo]

All right...Ivan (iv30) did all the wiring on my gauges, and he's far from a newbie when it comes to electronics. In fact, I don't know anyone better with electronics than him in the NW. With that said, we're both clueless as to what's wrong with my gauges.

First off, both the EGT gauge and Oil Temp gauge comes with the following wires:

12v Constant (Orange)
12v Ignition (Red)
Light (Yellow)
Ground (Black)

Sounds pretty straight-forward, right? Well, here's the problem...I turn the key to the accessory on position, and the gauges come to life. My EGT gauge goes straight to about 775 - 800 C. No, the engine isn't on...it just goes straight to that. I then turn the engine on, and the EGT needle moves with the power fluctuation, but otherwise, it doesn't budge. I notice while I'm driving, at idle it stays around 750 - 775 C, and when cruising, it goes to about 810 - 825 C. It DOES NOT move any lower or higher than this. Obviously something is wrong, but what could it be? Could my actual gauge be faulty?

I've also got an Oil Temp gauge, but the sensor isn't plugged in yet, nor is it even connected to the wire that leads to the gauge. It, like the EGT gauge, goes up to a constant level without the engine being on, moves a little with the power fluctuation when I turn the crank, then just stays stagnant after the engine is turned on.

Does ANYONE have any idea what is going on?

[supermarkus]

are you running off your clock harness? My gauges dont' exhibit that behavior at all, they go to 0 at acc.

[Verdugo]

I believe Ivan tapped the radio harness, but I don't know for sure.

[Got Boost]

if your gauges are coming on at acc then thats the problem i think. u need to have a +12V at ignition, not acc. maybe change the red wire and that will solve it?

[Verdugo]

Originally posted by Got Boost
if your gauges are coming on at acc then thats the problem i think. u need to have a +12V at ignition, not acc. maybe change the red wire and that will solve it?

Ivan and I are going to look at it again tonight. I told him it might be the ignition wire. He's going to try wiring it to the clock harness instead of the radio harness, but he also told me last night that he's sure he tapped the ignition and not the constant.

[Silver Bullet1]

It almost sounds like your EGT sensor could be shorted. Make sure the hot wire isn't getting grounded somewhere. You also need to be sure the sensor is grounded. If you used Teflon tape you could have a poor ground.

I would suggest buying a cheap multimeter so you can double check your connections what they are supposed to be.

Hope that helps. I just installed a Defi set and everything worked as expected. The clock plug has all four wires that you need and each is labled on the clock housing. You would have to remove the clock to be able to read it but I think NASIOC has a picture of which wires are hooked to what.

[Verdugo]

Originally posted by Silver Bullet1
It almost sounds like your EGT sensor could be shorted. Make sure the hot wire isn't getting grounded somewhere. You also need to be sure the sensor is grounded. If you used Teflon tape you could have a poor ground.

I would suggest buying a cheap multimeter so you can double check your connections what they are supposed to be.

Hope that helps. I just installed a Defi set and everything worked as expected. The clock plug has all four wires that you need and each is labled on the clock housing. You would have to remove the clock to be able to read it but I think NASIOC has a picture of which wires are hooked to what.

Thanks, I've passed that onto Ivan

[Verdugo]

Welp, Ivan rewired it, triple-checked it, tapped the clock power instead, and guess what? They both are still fubar Looks like I'm going to have to talk to Garret now about making an exchange or something