Todays results:
No response from home-made LED when DM was addressed through 38 pin connector. Built-in sw/led blinks in a seemingly random sequence of short and long blinks constantly when key is turned to on, does nothing when button is pressed.

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Will
94 E420
82 300DT
77 F250 4x4 429 Cobra Jet
69 Thunderbird 429 Thunder Jet
92 Mitsubishi Galant VR-4