Sounds to me like the amp is going into protection mode. Try placing one sub on the amp with very little gain. One of the biggest reason why this happens is because the subwoofers are wired wrong. What is the brand and model number for your amp?
4-Way
5-Way
6-Way
7-Way
Green
Yellow
Brown
White
Red
Blue
Purple
Right Turn & Brake
Left Turn & Brake
Tail Lights
Ground
Backup Lights
Electric Brakes
Auxiliary Power
Green- Right Turn and Brake
Yellow- Left Turn and Brake
Brown- Tail Lights
White- Ground
Red- Reverse (Back Up) Lights
Blue- Electric Brakes
Purple- Auxiliary Power
It sounds like your green and yello wires are shorted together somewhere along the length of the harness. I would check the wires on the trailer first. Easier yet, if you have another trailer to connec or access to another to use for testing, connect to it and see if the problem repeats; if it does the trouble is in the vehicle's wiring.
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I also are having the same problem with this mach-5175 1000 watt formula amp. It goes to protection mode everytime i turn it on. Everything is hooked up right.
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