Check the fuses on the car amplifier. The inline fuse on the car amp power wire may look fine, but also check the fuses on the car amp itself. If one of these fuses are blown out, then this will cause the car amplifier to automatically go into protect mode. To check the fuse, simply pull the fuse out and look in the middle part of it, you will see a thin small wire. If this is either snapped or burnt this is an indication the fuse is burned out. Always ensure any fuses you replace are replaced with the correct fuse rating the car amplifier manufacturer has suggested.
Check your ground wire. Is the black ground wire attached firmly to an screw or bolt directly onto the vehicles chassis? You should always mount the ground wire directly onto an metal surface that has all that paint sanded down around the area. Most of the time, there is left of paint spray inside the car that can cause an poor ground. The best way to remove any excess pain is to scrape off any paint using an flat head screwdriver or even better using high grit sandpaper.
Subwoofer final ohm load too low. You need to check the wiring configuration of your car amplifier with the subwoofer you are using. Your car subwoofer coils could be wired too low for the car amplifier causing the car amp to go into protect mode. For example, if your car amplifier only supports 4 ohm load and your subwoofer creates an 1 ohm load it may go into protect. Check online diagrams on how to wire your subwoofer correctly to the support ohm load of your car amplifier.
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