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Installing stereo and amp

1000 Views 2 Replies 2 Participants Last post by  lisat
Hi, I am trying to install an Alpine 445u amp with a new Sony stereo. I have found all sorts of diagrams online for this seemingly simple installation. But, I am confused about how power gets to the stereo! The diagrams show power going to the amp, speakers being attached at the amp, the blue remote turn on going from the amp to the stereo, and the RCA cables going from the amp to the stereo. No power to the stereo? No other wires going to the stereo that aren't from the amp? My stereo is not turning on. I have traced the power wire (attached to amp) all the way back to the battery and it seems to be OK. With this Amp, I can't really tell if it is on. However, from my reading I guess it isn't supposed to turn on until the stereo signals it to (reason for the blue turn-on wire).

Also, concerning the inline fuse, the amp has a 15 amp fuse. The stereo has a 10amp fuse. Since (if) the power only goes to the amp, should I just use the amp rating to calculate the inline fuse, or should I add the stereo and amp together to get the inline fuse amperage?

This is an old 82 VW Vanagon that had the stereo yanked out of it before I purchased it. I have cleaned up the wires and am back down to the basics. So, there are no weird factory installed components with this install!
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The Sony head unit needs to have its 12v constant and 12v switched wires connected.

If you still have the original factory radio wiring dangling around, you could use the 12v constant and 12v switched from those.

Otherwise, the 12v constant can be hooked up directly to the battery or you could use an open spot on an interior fuse panel (use a 10 amp fuse).

The 12v switched can be hooked up to the ACC wire. You could also check the interior fuse box and tap something that turns on with the accessories.
Thank You!! I just needed a bit of confirmation so that I didn't create some sort of weird loop and blow everything up. I am still testing a few things but it is, seemingly, working now!
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