Allison MT643 Neutral problem?
Hello Guys... Thanks in advance for your collective wisdom.
I have a '91 Gulfstream Friendship with a Cummins TD and Allison MT643.
Suddenly the rig wont turn over at all. It acts like a neutral problem. I have no ECU display or codes for clues. Batteries test 12.5V. The neutral switch is secure, and wires attached. My best clue may be that when I hit the starter, the Voltage meter drops to about 10, but engine does not turn at all. Voltage does not drop in any other drive position indicating neutral may be working. Any Ideas?