MTX TA7801 intercooler fan problem (Help)

Aloha new to this forum,I recently got a ta7801 from a friend and it performs great but only problem is the internal fan doesn't shut off completely even after i turn off my amp. Tried it with the HU remote wire and with a inline switch same result fan doesn't shut off. Anyone with any insight on this?

Thanks.

Click to expand...

So it stays on indefinitely if the amp is hooked up?

Yes

Click to expand...

hmm i was thinking maybe it was meant to stay on for a little while after the amp shut off or it was just using up some left over power in capacitors but i guess none of that makes sense. its getting power from the constant input somehow, i would probably rewire it a switched source like the remote turn on, but sorry, I have no input as to why its doing that. have you opened the amp case to look inside by chance?