Do I need this Plug n Play harness?
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Road Master
Joined: Apr 2019
Posts: 1,157
Likes: 565
From: TX
Do I need this Plug n Play harness?
22 Road Glide ST looking for a basic set up and then down the line will upgrade speakers and likely add speakers as well. For now looking to upgrade on a budget. Prior bike which I bought used had an unknown set of infinity speakers (I'm assuming kappas) and a J&M 2 channel amp. It was pretty much good enough for me as far as volume b ut def lacked overall I'd say but I feel if that was where I wound up initially again then I'd be fine with it.
So far I have MMats PA601CX and so far that's it. I'm looking at sounddigital 1200.4 so that I have head room for future speakers if they require more power and also have the addtl 2 channels ready to go which will eventually power tourpack speakers. most likely i'd initially upgrade fairing speakers and move mmats to the tourpack
I know I need power cable, ground cable, fuses and small bits like that. What I don't know about is do I need one of these plug n play harnesses? Garagebagger sells a couple different ones but here's the one i was eyeing - Plug n Play.
if I do buy this harness should I upgrade the RCAs? I only ask bc it doesn't specify what brand they are and I remember way back to car audio days that RCA quality was always a big deal
Also if I don't buy one of these premade harnesses do I need RCAs?
So far I have MMats PA601CX and so far that's it. I'm looking at sounddigital 1200.4 so that I have head room for future speakers if they require more power and also have the addtl 2 channels ready to go which will eventually power tourpack speakers. most likely i'd initially upgrade fairing speakers and move mmats to the tourpack
I know I need power cable, ground cable, fuses and small bits like that. What I don't know about is do I need one of these plug n play harnesses? Garagebagger sells a couple different ones but here's the one i was eyeing - Plug n Play.
if I do buy this harness should I upgrade the RCAs? I only ask bc it doesn't specify what brand they are and I remember way back to car audio days that RCA quality was always a big deal
Also if I don't buy one of these premade harnesses do I need RCAs?
Road Warrior
Joined: Feb 2016
Posts: 1,354
Likes: 399
From: Vancouver, BC
You don't need to use a T-Harness but many do for the convenience and flexibility. The harness you linked will work with your SoundDigital amp. Don't use T-Harnesses like this one or this one as that amp won't take speaker/high level inputs on the RCA inputs (low level only).
You will need to flash the radio to enable the rear channels if you chose to put speakers in the lids (you mentioned a TP? Haven't seen a ST with a TP yet). You will want to flash the radio anyway if only to flatten the EQ. Alternatively you could use RCA splitters to feed all 4 channels on the amp from the 2 channels the ST has as stock. Another option might be to use an amp that allows 2 channel inputs with 4 channel outputs.
Another option, instead of using a T-harness, would be to take the front speaker outputs from the HU and run them directly to the amp as speaker/high level inputs. You would use a cable like this to do that and then run new speaker wires from the amp to the speakers. This is the way I'd go for a basic setup as I prefer to not use low level/RCA inputs with LOCs when the amp is able to take high/speaker level inputs. Your challenge here will be how to split 2 channel inputs into 4. Again, you could use a different amp or use a T-harness and flash the radio to enable the rear channels.
You will need to flash the radio to enable the rear channels if you chose to put speakers in the lids (you mentioned a TP? Haven't seen a ST with a TP yet). You will want to flash the radio anyway if only to flatten the EQ. Alternatively you could use RCA splitters to feed all 4 channels on the amp from the 2 channels the ST has as stock. Another option might be to use an amp that allows 2 channel inputs with 4 channel outputs.
Another option, instead of using a T-harness, would be to take the front speaker outputs from the HU and run them directly to the amp as speaker/high level inputs. You would use a cable like this to do that and then run new speaker wires from the amp to the speakers. This is the way I'd go for a basic setup as I prefer to not use low level/RCA inputs with LOCs when the amp is able to take high/speaker level inputs. Your challenge here will be how to split 2 channel inputs into 4. Again, you could use a different amp or use a T-harness and flash the radio to enable the rear channels.
Last edited by hamah; Jan 2, 2023 at 04:56 PM.
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Road Master
Joined: Apr 2019
Posts: 1,157
Likes: 565
From: TX
Perfect. Makes sense.
Yeah I know ST is "performance bagger". Tour pack would be for when wife rides here and there or we go on trip like sturgis or something.
Day to day I ride with solo seat
Yeah I know ST is "performance bagger". Tour pack would be for when wife rides here and there or we go on trip like sturgis or something.
Day to day I ride with solo seat
Novice
Joined: Apr 2018
Posts: 19
Likes: 2
From: NB Canada
Another option, instead of using a T-harness, would be to take the front speaker outputs from the HU and run them directly to the amp as speaker/high level inputs. You would use a cable like this to do that and then run new speaker wires from the amp to the speakers. This is the way I'd go for a basic setup as I prefer to not use low level/RCA inputs with LOCs when the amp is able to take high/speaker level inputs. Your challenge here will be how to split 2 channel inputs into 4. .
can you not use left side as channel 1-2 and right as 3-4. And then when you bridge it goes back to a 2 channel?
Road Warrior
Joined: Feb 2016
Posts: 1,354
Likes: 399
From: Vancouver, BC
that is the wrong cable for doing that. I say that because I just purchased that expecting to do the same thing. That connector is for the output of the amp to go back to the speaker pod. It needs the long molex to be used as to go from headunit to Amp.
can you not use left side as channel 1-2 and right as 3-4. And then when you bridge it goes back to a 2 channel?
can you not use left side as channel 1-2 and right as 3-4. And then when you bridge it goes back to a 2 channel?
You are also correct that you could bridge 1/2 and 3/4 for the fronts but what's the advantage there unless you need the power? Just use 1&2 inputs and 1&2 outputs for front speakers and leave channels 3&4 open until you want/need rear channels.
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