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Hi Bruce,
That yellow/red wire was the subject of curiosity for me before. It is used for both purposes - shift light on the 5-speed, and OD-off light on the automatic.
The violet lead is a jumper to ECU-26 which is a harness difference in the manual tranny cars; taped and folded back on the automatics. I suffered a previous tech's mistake (89 245) where the violet wire was thought to have fallen out of the connector (instead of purposely left out and taped) and "replaced". That causes a resistor in the shift indicator circuit of the ECU to char the ECU circuit board when the OD is not disabled.
There were a couple manual to auto conversions of LH2.4 240s done by brickboarders, so I have posted the warning about the harness differences before, but I think in both cases the OD relay circuitry was not included among the AW-7x transplants. Because LH3.1 appears to be only a 5-speed thing in 240s, its harness must be shared by both.
Further checking on another 89 (properly taped) and a 91 revealed Volvo had changed the harness (by 91) to place the violet "jumper" in a less obvious place behind the instrument cluster, instead of in the plug above the fuel injection relay as on the earlier cars. I suspect the 92's violet jumper is where the 91's was found.
--
Art Benstein near Baltimore
"He has Van Gogh's ear for music." Billy Wilder
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