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Old 04-24-2012, 10:14 AM   #1
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Amp Wiring

Hey all, for wiring an Alpine KTP-445U amp what's the best way to do that on a '12 JKU? Do you guys run the power and ground wire directly to the battery or is there a location on the TIPM for accessories like this? I want to wire this thing up to my OEM non-nav radio and would be splicing it into the radio wiring harness via speaker level inputs using posi taps connectors so I don't have to modify the harness. Any recommendations for this job? All input appreciated!

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Old 04-24-2012, 12:53 PM   #2
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What gauge does the Mfg recommend for the power supply? Probably 8 ga?

Rule of thumb is you run a positive line directly to the battery and fuse it within 8" of the terminal. Fusing is a must, no exception. For ground, you can find the closest ground to the amp as you can find. Again use the proper gauge fromt he Mfg. You want the ground as short as possible. Use a solid ground like a seatbelt bolt or seat bolt that is directly bolted to the chassis. Also you want no paint in between that connection. If there is paint, remove it before clamping down on it.

Amp wiring is very specific to the amp Mfg. I am running a 4 ga line from the battery into the cabin and fuse/split to 2 x 8 ga for my 2 amps. My Fosgates require 8 ga. Again each time you step down in gauge, you fuse that line.

I am also running a home run (electrical wiring term) for an additional +12v from the battery. Basically a 10 ga line fromt he battery (fused) into and under the center console for use in a relay switch. The HU remote out "flips" the relay and the +12v power goes as a turn on to my 2 amps and Sirius connector. That way the +12v powers the Sirius connector and 2 turn ons for the amps. I want the HU harness to only supply constant +12v and swirtched +12v to the HU only - nothing else. The wire gauge in the harness is tiny and I don't use that for any additional.

For your purposes, the speaker signal will be the amp remote, correct? Then all you need is a positive and a ground wired. But fuse that +12v!!!

Hope that helps...

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Old 04-24-2012, 01:30 PM   #3
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Quote:
Originally Posted by Lynskey View Post

Rule of thumb is you run a positive line directly to the battery and fuse it within 8" of the terminal.
and you cant have it too close, anywhere between 6-9 inches.
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Old 04-25-2012, 07:17 AM   #4
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Well I planned to install the amp in the dash because it's very small and designed for OEM setups. The ground would be near the doors. My auto dimming mirror is grounded to the door bolt so can I piggy back onto that ground or do I need to find a new one? Not sure if grounds can be shared? The amp also requires very little power and Alpine claims you can just piggy back onto the radio's +12v source but I would run a 12 gauge wire to the battery. I was hoping I could go to the TIPM onto some kind of accessory terminal but have never looked at that thing. My main problem is where to tap into the speakers for the amp if it is located in the dash under the radio? You say the wire gauge at the harness is smaller than the gauge on the speaker terminals themselves? Where should I tap into the speakers? I'm not sure about the remote or how that wires in or if the amp turns on based on speaker signal and how long it waits to turn off after that. I'm a bit of a noob at this but not afraid to tackle it since I have done it before as a kid (when things were a lot less technical) and I setup my decked out home audio systems and those of friends/family easily enough. You must have like 10 different wires run to your battery, do you have some kind of connector you use to connect to the battery post? Thanks for the help!
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Old 04-25-2012, 07:51 AM   #5
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In general, I run seperate power to amps. Even if the Mfg days to use the harness power, I would run a bigger gauge.

Not sure how the amp turn on is, but you could tap into the fronts in the lower dash for a speaker signal. You can get to the speaker wire plug fairly easily.

For my system it is a 4 gauge for the amp and a 12 gauge that will supply power to everything else I need. Pretty simple with the HU remote out activating a relay that powers up everything.
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