Amp comes on then shuts down JL 500/1

Because your amp is overheating. The transistors are attatched to the heatsink inside the amp. Alongside these transistors is a sensor that shuts down the amp when it reaches a certain temperature. A very easy repair. Clean up the old paste and add new thermal paste.

I think you might have your remote turn on from your deck to amp hooked up wrong check that out!! I not are you familliar with the mr. butterworth crossover JL developed for that series of amp? Just like its big nrother the 1000x1 class D the built in smart crossover has many built in pretect modes. If your subs are drawing to much power it shuts down if they draw to little of ohms or to many but that 500 is 1 ohm stable so download the crossover settings from JL and go from there

yes the amp can be blown and not show protect. I do warranty work for JL Audio. Have you tested your subs to see if they are ok? If they are then something internally is stopping the amp from working. I repair amps very cheaply to help out fellow car audio enthusists. I am the cheapest in the US. If you have not figured this out yet and want it repair let me know. Send me a message.

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/mark_b53a7494531bf96d

If the amp is a JL 500/1v2, it has a sensing switch which enables it to sense voltage, instead of running a remote wire. If this switch is set to on, and you have a remote turn on wire running to the amp........this can happen. I own one of these, and made that mistake myself.

This happens to me all the time during the warm months. The problem is likely that the amplifier is overheating because of location. If not properly ventilated, the amplifier will shut off before damage occurs. Is it located under a seat or other area where sufficient air flow is lacking? I solved this problem by moving my amplifier from under a seat to the trunk area.

because of plug lost

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

Did you attach an earth lead to the cars bodywork?

You can send it to JL Audio and they will fix the output stage you toasted and will also perform any mods or upgrades to bring it up to spec. This will set you back $ 180.00 plus shipping cost to send it to JL. I know it's expensive but you damn near get a whole new amp to rock your world. mark..

the overload protector of your unit it so sinsitive try to cutof the overload relay and then observe 20 min. monitor the allominum heatsink the temp. normal