Thanks for the update.

Do you have the red one or the green one?

My guess is that it was either picking up noise off the alternator and putting out false triggers, or it was in a diagnostic mode indicating a bad battery voltage level. The red version of the board had a lot of extra circuitry on it to do diagnostics.

Good to get it working. A person with the red board recently bought my replacement amp. He was having the same issue. I never heard back so I assumed my replacement fixed it.

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79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 170k miles
97 C280 147k miles