Hello their, frist of all is the amp in the truck
running any woofers?
1. the alpine radio how old is it 2005-2009 ?
shuld have plenty of power
to pay the facory speakers and even up grades to a certain level.
try finding what that amp is playing ..
know if that amp palysyour system just needs to re-just!!
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there is a micro switch inside the player than turns off the radio when the cassette is being played, this switch fails and locks out the radio, this defective switch causes the radio to not switch switch back on when the cassette is removed, u do not mention the make model or year so that is about as much as i can give you right now, but in most cases if this is an older car it is best to try find another used radio on EBAY, if it is an aftermarket unit just replace it, the repair cost in most can exceed what the cost of a replacement is.
The inputs to the LOC should be tapped from your rear speakers. If you have the color code of the wiring from either the cassette player or from the vehicle wiring, tap the wires behind the dash. If you do not have the color code, you can tap directly from the speakers. In either case, it's best to use good quality twisted pair wire and keep the wires as short as possible. Likewise, use good quality RCA cables from the LOC output to your amp location.
no you don't have to hook up both of the power terminals. but should have it hooked up so you get the proper power to the amp. use a disubution block with two 8 gauge wires.
do you know if the radio's rca jack's are good? have you ever had another amp in the car? if it worked before try new rca's from the radio to amp. recheck all connections from amp to speakers and make sure no wires fell off.
neither of those units use fibre optic cables! but it sounds like you puled out the antenna wire behind the head unit. if you try and search radio stations without the manual tune on and it keeps changing frequency on it and never stops then its the antenna plug.
Make sure that your amp turn on wire is connected from behind the radio to your amplifier. Usually the turn on wire is a blue wire but it can be any. This blue wire connects from the blue/white wire behind the radio to your small connection turn on connector on the amps power connections. You have 3 ( 12V , Ground, Switch or the smallest connector)
Also check the amplifiers fuses, and the main powerline fuse as well. If this doesnt work then write back to me.
If your are certain that you have a signal going to the imputs of your amp and you are certain that the speakers are OK and you have not turned the gain control all the way down then that just leaves a fried amp. Good luck.