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Eletrical gremlin

Old 11-21-16, 01:04 AM
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Eletrical gremlin

Car- S5 Vert with S4 TII drivetrain swapped in by local shop (a few yrs back). Running a Microtech Lt10. Running w/o emissions, or AFM.

Problem: The car has a electrical gremlin that showed up twice again this weekend. The car would just die while running. This weekend it did the same, it just died while it was idling as I was getting ready to wash the car. (luckily I wasn't driving it on the road, geez)

The car just shut down with the key in the ON position, the lights on the microtech are all off. ( I assume the fuel pump is OFF too). The car will still crank, starter turns. But without power to the Microtech/fuel pump, it obviously didn't start.

I've recently changed out the ignition switch, thinking that was the main culprit. But the switch is now good. 12V on the Black wire. When turned to ON position, two other wires get 12V as well. Checked the main fuse by the driver's shock tower, all good. Checked all fuse by drivers foot rest, all fuses are good. Headlight switch is good, headlighst work, idiot lights turn on, brake lights/flashers work. Radio works, door lights work.

I got my ohm meter and tested the harness plug at the microtech. BATT = 12V, IGN = 12V.
My question: Does the microtech need ANOTHER signal in order to turn on? light up the green and yellow lights.

This electrical problem is so frustrating. trying to find something that disappears and reappears is so futile. (I got into the engine and fiddled with the CAS plug/harness and touched another plug ( around the CAS area), and I heard the fuel pump whining...Got inside to check, the lights on the Microtech are now lit, cranked and it turned over and stayed on. Bad ground somewhere?


Any other places to check ebfore i throw in the towel and send it to the shop?
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Old 11-26-16, 10:13 AM
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The Microtech only needs the constant batt 12V and the IGN 12V voltages to run. Nothing else. Obviously a good ground is needed too, so check your grounds very carefully.

How is your Microtech obtaining the 12V IGN signal? Tied directly into the ignition switch?

Fuses can be intermittent. Especially if a crappy inline fuse holder is used.

Relays can fail as well.

Would need a bit more info about your install to offer specific suggestions. Like detailed pictures of all the wiring.
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