Hey, well I have the 9815, and in the manual it says you’re supposed to hook up the power wire dirctly to the battery.
However, my freind said that that’s BS and it will be fine if you hook it up to the wiring harness. Now it’s hooked up to the wiring harness.
I ask because my deck turns off if I turn it way way up, and I’m wondering if this is the cause of the issue (my alternator is also boinked so that could be it too?).
i have an alpine in one of my cars alpine is my fav in affordable gear, you don’t need to directly connecto to the battery in most cases, it is better if u do but i never did it once when i was an installer lol
And it ran fine? you could turn it all the way up and it played?
You say it’s “better” to hook it up to the battery, but how so if you epxreinced no problems hooking it up to harness? what makes it better?
yeh no problems, i have mine hooked up throught the harness, works flawlessly…
it’s jsut better technically, any time you can limit the restrictions in the wire runs it’s a good idea to do so, it just maximizes the preformance of your devices if you can supply them with all the power they need… while it may run fine with no problms it’s not nessesarily optimal to have the power routed through all those harness wires… if your electrical system is in less that tip top shape the harness maynot be adiqute for your power demands… eventually with more powerful decks etc you will need direct power…
if it were feasablle every device in the car would have direct wire runs…
I see thanks, so is it possible that the alternator is causing the deck to turn off or do you think it’s osmething else ?
Correct me if Im wrong here but you need to connect the power wire to a source that is constantly on (hence why they say to the battery) to allow the deck to retain all your memory settings. If you wire a deck into aux power then everytime you turn it off you reset the deck.
You didnt mean runnng a wire directly to the battery did you? Cause thats just silly.
that isn’t his problem, he’s saying the deck shuts off when he turns up the volume, this would mostlikely be that it’s drawing to muchpower at high volume for the internal amplifier leaving not enough to power to power the rest of the circutry shuttign the deck down, i know thisbecause it’s exactly what happens if u let your battery run down to notihgn while playing the stereo… turn the volume back down and your ok…
theres one wire in the harness for constant power one for aux power the aux power is just a trigger to turn on the deck… the constant power which actually powers the deck(and saves your presets etc), CAN actually benifit by being directly connected to the btattery, 99% of decks this is ridiculous overkil and pointsless, but some of the higher power alpine decks etc DO reqiure direct battery connections for optimal performance because of massive internal amplifiers… this isn’t one of them but often alpine reccomends that do do anyways, as i have said before i never once did it on those lower model decks
^^ What he said 
Anyways, so could it be my alternator? The max volume is 35…it can run over 30 fine without subs but when the subs are hooked up (and they always are) if I run it over 26 or so it will turn off after a few seconds and turn back on (This is at the subs being set to +7). If I turn up bass booster it won’t let me go louder than 22ish.
I want to fix this but don’t want to just throw parts at the problem so I want to make sure it’s the alternator and not something else ?
before you can see if ur alternators gone get a voltmetre and see what ur batterys charging at…then if its fine check all connections then make a direct connection from the batter to the deck u can do this externally by just taking the deck out a tiny bit and running a wire through ur window just to check,…is thats the problem then take the time and run a new wire from the batter and through ur firewall to the deck…
yeah ^^ he’s got it, check your alternator, if it checks out, run a test wire.
you might want to check out your battery too.
and also ensure all your wire connections for the whole stereo system are good, solid and well insulated it’s just always a good thing to do.
If you read the manual, you wouldn’t need to listen to your friend.
Search Alpine’s site for the PDF on how to wire it up.
read the manual???, men don’t read!!! lol,
in any case he alredy has the manual lol …just chooses not to take the manual as gold