Hey,

First time poster here since acquiring an old used 93 Maxima GXE. Anyway, have this issue with the HU unit/speakers. Not a Bose system.

Replaced a broken factory HU with a Kenwood X659 (cheap and cheerful). HU unit works perfectly as I've heard it in another car.

Here's the problem:
With ignition off, new HU unit works just fine (rear speakers work, front right speaker is out - probably blown, front left is very hissy with little loudness, probably gone bad also).

Turning on headlights causes all speakers to cutout. Speakers do not come back on until I've turned off ignition and lights, after a short wait usually around a minute or so.

Turning on ignition only (not lights) will cut speakers out but turning hu on and off repeatedly will usually make them come back to life.

Another funny thing is that with headlights on (and hu still on) I can hear hissing until I play with the dimmer switch and set it to max.

This is obviously an electrical problem of sorts, just wondering if anyone's experienced it before.

Don't think anything is fusing, but maybe a switch/overload circuit's gone bad.