transmission lock question
I'm not sure if this applies to yours, i have a 95 Gulfstream Friendship 102 with a cummins 8.3 and allison 6-speed push button. I found out that it has an overspeed circuit such that you can't get it into gear if rpm's are high. This may be a stretch, but perhaps the lights put some load on the engine that (due to the alternator) that it slightly slows down the engine rpm, thus removing the interlock. Just a thought.
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