Quote:
Originally Posted by Dbacks2k4
The reverse sensor for the transmission may be bad which is why you're not getting a hot wire back there.
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And, depending upon the configuration, you might find a wire that's hot all the time and doesn't change when you shift into reverse. On our older Ford, the reverse sensor switch actually completes the ground path in the reverse light circuit. Dbacks is still right, it might be the switch. But if you're looking for a wire that changes state from "cold" to "hot" when you shift, you might not find one if your setup is switched through the ground.
And like SportyRick says...tell us more. I'm assuming an older bus with a simple switched circuit. But if you have a bus with an ECU or MCU or TCU or whatever computer might control it, that could complicate the troubleshooting.