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    1. · 92 TURBO
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      "Considering the Alpine KTP-445U Power Pack, which is an amp that can be powered off your factory head unit's power wire as long as the fuse is 15A or higher. It seems the main fuse is only 7.5A, but my '89 also has the 20A Dome fuse in the engine bay's fuse box, and per the diagram below, apparently it is used with later MK3s that had a separate factory amp. My car does not have that external factory amp, but do I have what I need to power that Alpine amp? Or am I gonna need to run it directly from the battery like any other amp? If I do have what I need fuse-wise, would I then need to tap into a different wire, or just the usual power wire (blue/yellow, I believe) going to the head unit?"

      So on an '89 without factory CD player the P-L (pink w/ blue stripe) wire is the amp turn on from the radio power switch. It's from the 7.5 amp radio fuse and it's in the 10 space radio plug "A" at position 9 in pic below 3
      Amp gets a turn on signal from the P-L wire once head unit is powered on.

      The power for the amp is off the 20 amp dome fuse which is the L-Y (Blue w/ yellow stripe) wire which is also in the 10 space radio plug "A" It's Hot all the time. Top row below tab release on end at position 4 in pic.


       
    2. · Registered
      Joined
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      439 Posts
      Discussion Starter · #24 ·
      "Considering the Alpine KTP-445U Power Pack, which is an amp that can be powered off your factory head unit's power wire as long as the fuse is 15A or higher. It seems the main fuse is only 7.5A, but my '89 also has the 20A Dome fuse in the engine bay's fuse box, and per the diagram below, apparently it is used with later MK3s that had a separate factory amp. My car does not have that external factory amp, but do I have what I need to power that Alpine amp? Or am I gonna need to run it directly from the battery like any other amp? If I do have what I need fuse-wise, would I then need to tap into a different wire, or just the usual power wire (blue/yellow, I believe) going to the head unit?"

      So on an '89 without factory CD player the P-L (pink w/ blue stripe) wire is the amp turn on from the radio power switch. It's from the 7.5 amp radio fuse and it's in the 10 space radio plug "A" at position 9 in pic below 3
      Amp gets a turn on signal from the P-L wire once head unit is powered on.

      The power for the amp is off the 20 amp dome fuse which is the L-Y (Blue w/ yellow stripe) wire which is also in the 10 space radio plug "A" It's Hot all the time. Top row below tab release on end at position 4 in pic.


      So the problem I'm running into today is one I was worried might happen, and that's the scenario where the new sub only has power when the power antenna is up and the radio is on. Go to CD or cassette mode, the antenna drops, and power is cut to the powered sub. The remote turn-on wire for the sub is connected direcly to that P-L wire for AMP+ in the #9 position of the 10 pin connector. Trying to figure out the workaround at this point.

      The sub is sounding pretty good with the radio so far though.
       
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