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I had the same when I bought mine last June.
After research it seems to be a common problem on the Boxster radios of those years (I assume its not the BOSS). Seems the radio goes wack above 12Vdc when it gets old.
If you put a POT inline and reduce voltage to 12VDC it will work.
It shuts down because when you turn on the engine, the alternator starts and shoots 13-14vdc in line.
When turning on all accessories (AC, Heater, full blown fans, fog lights front and back) boom radio comes on, turn off fogs, boom, goes off.
In then end, I could have made an electronic hack to keep voltage at 12vdc, but took the opportunity to install a 7" Joying Android car entertainement stystem.
I now have Spotify, phone integration bluetooth and WAZE in my 986. Couldnt be happier.
BTW, I'm using the same ignition and same AMP, so dont go hunting for problems in those 2, they are fine.
If you do the test above (activating all accessories to see if the radio turns on, while engine running) it'll confirm that you have the exact same problem I did.
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