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Did you check the fuse(s) on the amp itself ?
One or more of those fuses are for protection on the output side of your amp.
What about the 12 volt power from your battery, have you checked for 12 volts present at the input power side of your amp?
Don't forget that you need just as good of a ground as you need power supply!!!!!
Good luck !
what do you have hooked up to it? Subs, Speaker, so on. it sounds like it is going into protection because of improper wiring... or it was improperly wired. if it is malfunctioning you need to take it to an authorized JL audio dealer. It's going to cost some cash unless you have a warranty on it and it was installed by a liscensed technician.
just go through ur connections man one by one ull find the prob soon.....check teminals on battery...power line to amp ....all fuses within prob area and obviously make sure u have a good ground.....really impotant.....ground is the most neglected thing people do from my experience bein a audio tech oh and if that isnt it check ur subs....stick a 9v batt on the back pos n neg of each sub n c if they pop in r out this will determine if ur subz r blown
The JL Audio 500/1 outputs 500 watts RMS into a load from 1.5 to 4 ohms. Whether your subs have 2 ohm or 4 ohm voice coils, they should be wired in series and the subs paralleled to the amp. The final load to the amp will be either 2 ohms or 4 ohms, both of which the amp can handle. If you parallel the voice coils and then parallel the subs, the final impedance will be either 0.5 ohm or 1 ohm, both too low for the amp.
You can wire each sub to a separate set of terminals or both to the same set. The terminals are connected internally. It doesn't matter which of the +'s or -'s you use.
Re-check all the connections to the speakers, The uPC monitors all the outputs and if any are taking more power than they should, the uPC shuts the amp down to protect the internal components. Don`t use tape joints alone, try to run the cable the full length without any joints. If you do have to piece the wires together, solder them and stagger the connections, in other words, make one lead shorter than the other so that if the tape does come off, the offending connection is well away from the other so they can never meet or connect to each other. Ian
It sounds like the power supply failed. Generally when the supply fails in that amp, you have to replace all 8 of the power supply FETs and all 8 of the 47 ohm surface mount resistors. Many times, the supply fails because one or two of the output transistors have failed.
If you want to have JL repair it, you MUST go through an authorized JL dealer.
If you have a good local repair shop, they should be able to repair it.
Assuming that you've confirmed that the speaker is in good working order and that the wiring isn't shorted in any way...
There are separate power supplies for the high and low amplifiers. It's possible that the one for the sub output has failed. If that's the case, the output transistors probably failed and that's what damaged the supply.
Generally, I'm willing to help people repair their amps but this is a large, complex amplifier and it should be repaired by a qualified technician.