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If the ignition is off, the transmission light should not be illuminated. The TCM doesn't get power until the relay sends it. Swapped in other tcms that work and got the same issue. That next makes the issue the relay, which is independent of the TCM. The problem is that the relay is working...

The TCM has nothing to do with it. Somewhere in the A2 harness it gets the 24v switched ignition signal that tells the relay to turn on, but I don't know where. I think something with the special forces wiring of accessories and whatnot they tapped into something that they shouldn't have and...

No I have not. Don't really want to either. but I am running out of options. Tried a different ignition switch with no luck.

Still have the issue. Swapped the transmission relay with a brand new one and one off my m1123 and the transmission light is still illuminated with the ignition off. I swapped the circuit breaker and it still has the same issue. Cleaned all connections on the transmission. Unplugging the wires...

Hello all, I have a M1025A2 HMMWV that has had an issue with the transmission light since I received it. The problem is that the transmission light is illuminated after the vehicle is turned off. This leaves the TCM on and eventually kills the batteries. Once the vehicle is turned on, the...