ok i have this 750 lighting audio car amp and i have it hooked up and it works great then i took that out and put in a 1800 watt pyle car amp and when i hooked it up it went to a green light like its supposed to do then about 2 seconds later it went to protect could it be the ground is bad for the 1800 watt amp i checked the fuses and there all ok is there any thing else that i can check?}}