92 454 O2 sensor

[Tiger Joe]

Anybody tell me any info about the O2 Sensor on a 92 K3500 with a 454?

Particularly:
1- what color is the sensor wire?
2- what route does it take?

I found a troubleshooting guide online but it’s for a 5.0 not a 7.4. Says the oxygen sensor wire should be purple. Ours is black with a red stripe. And it seems like ours comes out of the sensor, goes up across the core support and over to the ECM?


Here’s the issue. Truck throws a code 13 constantly. No other codes. We put a new sensor in first, cheap enough to start there. No change