Fosgate punch 300-12 problem

[B40dash8]

Hello all I’m new here. I just recently bought a used Rockford fosgate punch 300-12 amplified subwoofer. I have it hooked up with 8 guage power and ground cables along with remote turn on. Using rca cables. The problem is works great when working but will just stop working out of nowhere. I figured out if I hit the amp part of the sub with the end of a screwdriver or anything hard it comes back on. Is there anything that could be loose that would be easy to fix? I pulled out the amp and all wires are clean and still connected. I don’t see any thing dirty or not soldered together on the circuit board. Just wondering if there are any known problems that could be causing this problem? Thanks for the help!

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[1aespinoza 10+ year member]

Is the blade fuse snug? Cold solder can develop fine cracks that expand when heated from use, so a visual may not catch that crack. If you own a soldering iron, I would touch up all BIG solder joints. If not, then a tech is your best bet.

 

[B40dash8]

Is the blade fuse snug? Cold solder can develop fine cracks that expand when heated from use, so a visual may not catch that crack. If you own a soldering iron, I would touch up all BIG solder joints. If not, then a tech is your best bet.

Thanks for the response. Yes the 2 blade fuses are very snug. Snug enough that I cannot remove them with my fingers. I do have a soldering gun. The car stereo place close by gave me a quote of 95 bux for a diagnostic test which Doesnt make sense because I paid 150 for the thing. Just weird how it works amazing then just stops working until I hit the the thing then it works great again.

 

[1aespinoza 10+ year member]

Just weird how it works amazing then just stops working until I hit the the thing then it works great again

This behavior is very common in Silverado gauge clusters. When needles jump around by tapping, it indicates broken solder points. I had a tech touch up all points, been 3 years. Also relays do the same thing. I have fixed a few by the same method.