The red light on my kenwood stereo amp KAC-628 will not turn on. I was wondering which wire is causing this to happen?

Running it too hard? It has 'anti-thump' circuitry, so yours is broken.

Specs

https://www.crutchfield.com/S-uo05km8Gu2l/p_113KAC628/Kenwood-KAC-628.html

Overheating

https://www.google.com/search?q=kenwood+kac-628+amp+overheating+problem

..

Check your ground and remote trigger

Hi, email me the pic that shows the broken brass piece, tx,

The red light you describe on your amp, is the protection mode warning light. An amp goes into protect for many reasons. Here's a checklist.

1st check the fuse (s) on your amp and make sure they are not blown.

2nd check the inline fuse next to your car battery (if you have an inline fuse)

3rd, disconnect the speaker wires with amp on, does the light go off?

4th check your ground, this may be ok if you have tried another amp with the same wires.

5th.if none of these turns the protect mode off, it may be an internal fault.

you may have blown transistors and it is a tricky job to repair and costly.

I suggest 8 gauge wire. If 4 gauge doesn't cost much more, than get it. Then you will always have room for an amp upgrade.

I’m happy to help further over the phone at https://www.6ya.com/expert/chris_7f7f91eb941fb23f

Hi and welcome to FixYa,

To my understanding, a Kenwood KAC-628 is rated with max power of 100 watts X 2 at 4 ohms per channel. Incidentally, it is bridgeable resulting to 300watts X 1.

Good luck and thank you for asking FixYa.

that means you probably have a shorted speaker wire, a bad speaker or the amp itself is bad, try disconnecting the speakers one at a time and see if it turns on or not. if the red light stays on with no speakers hooked up it means the amp is bad

HI DUDE EVERY REMOTE WIRE THEY HAVE FUSE NEAR THE BACK OF PLAYER TRY TO CHANGE IT .... R...TRY UNPLUG UR AMP .. AND ..FIX IT BACK

Nope it's not a high-to-low level converter problem, it's most likely a problem with one of two things. 1) either you've blown the output stage in the amplifier, or 2) you've hooked up your subs wrong and your amp is seeing to low of an impedance. The amp is supposed to be 1ohm stable, but we had the same problem. When the indicator light goes red it means that the amp has gone into protection mode, now you have to figure out why. If something in the amp goes bad or just disconnects from the board it will cause power protection mode. If you fry something on the board because you are running the amp to hard or at the wrong impedance it will go into thermal protection mode, however there's no simple way to figure out which has happened.

Have you tried hooking up some different subs to see if the problem remains? try this. If the problem no longer happens then you know it's your subs, if it does still happen then you'll know it's an internal problem.

Years ago I had a Kenwood KAC-821; long story short, I melted the main power wire right off of the board, everytime I turned the system up the amp would shut down.

Take you amp to an authorized dealer and have them bench test it for you.

Let me know what you find out.

If you disconnect the speaker wires from the speaker output terminals of the amp, does the light still blink with the music?