Wiring LED light bar

joop1881 · 05-15-2018, 07:06 PM

Long time lurker, first time poster. Thanks for all the help via old threads. Been nursing a barn find 1990 DS back to her former glory. One of the last items on my checklist is an LED bar to use for general lighting. Just a little 12” guy. Purchased the light and wiring harness and thought I was getting a rocker switch without a light (to avoid this problem). I have everything wired up and lights work, but now I realize there is a light on the rocker. I am worried about power drain. I managed to wire my power meter through the key switch, but I know it can take all 36v.

So, is there a way to wire up via the key switch?

Here is the diagram for my harness: http://mictuning.com/mictuning-led-l...ail_p0054.html

Thanks in advance. Sorry if this has been beat to death elsewhere. I’m looking forward to sharing my progress soon.

Sergio · 05-15-2018, 08:22 PM

I am assuming Your +12v source is not controlled by the key switch.

The easiest way would be to just disconnect the black wire from Terminal #7 on that back of the switch.

That negative is for the LED that is always ON, the other LED that lights up when the switch is ON will still work.

joop1881 · 05-15-2018, 08:29 PM

BINGO, Sergio! Thanks for catching that.

joop1881 · 05-15-2018, 08:33 PM

I’m happy with this solution, but open to any method anyone has for a fix that runs the wiring through the key switch. Wouldn’t mind the horn operating that way as well.

Sergio · 05-15-2018, 08:36 PM

Are You using a separate battery for 12v?

Regardless of the source, use a relay wired like below to switch the +12v On/Off with your 36v key switch:

This is the 36v relay you need:

https://www.mouser.com/ProductDetail...g3TKX2%2f0A%3d

joop1881 · 05-15-2018, 09:55 PM

Currently just running through two of the batteries, not a dedicated battery.

The relay I’m using just came with the harness. I’ll look into the difference between the two and likely purchase one that you mentioned.

Thanks again, excellent info.

Sergio · 05-15-2018, 10:02 PM

You can keep using your existing 12v relay.

Just disconnect the wire that goes to your +12v battery connection and run it though the contacts of that 36v relay.

That way when your turn the key switch OFF it will interrupt the +12v power to any/all accessories you have.

If You read around the site you probably already know that tapping 2 batteries will be an issue if you use your accessories a lot.

05-15-2018, 07:06 PM	#1
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30	Wiring LED light bar Long time lurker, first time poster. Thanks for all the help via old threads. Been nursing a barn find 1990 DS back to her former glory. One of the last items on my checklist is an LED bar to use for general lighting. Just a little 12” guy. Purchased the light and wiring harness and thought I was getting a rocker switch without a light (to avoid this problem). I have everything wired up and lights work, but now I realize there is a light on the rocker. I am worried about power drain. I managed to wire my power meter through the key switch, but I know it can take all 36v. So, is there a way to wire up via the key switch? Here is the diagram for my harness: http://mictuning.com/mictuning-led-l...ail_p0054.html Thanks in advance. Sorry if this has been beat to death elsewhere. I’m looking forward to sharing my progress soon.
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30

05-15-2018, 08:22 PM	#2
Sergio Gone Wild Join Date: Sep 2012 Location: Charlotte, NC Posts: 9,329	Re: Wiring LED light bar I am assuming Your +12v source is not controlled by the key switch. The easiest way would be to just disconnect the black wire from Terminal #7 on that back of the switch. That negative is for the LED that is always ON, the other LED that lights up when the switch is ON will still work.

05-15-2018, 08:29 PM	#3
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30	Re: Wiring LED light bar BINGO, Sergio! Thanks for catching that.
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30

05-15-2018, 08:33 PM	#4
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30	Re: Wiring LED light bar I’m happy with this solution, but open to any method anyone has for a fix that runs the wiring through the key switch. Wouldn’t mind the horn operating that way as well.
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30

05-15-2018, 08:36 PM	#5
Sergio Gone Wild Join Date: Sep 2012 Location: Charlotte, NC Posts: 9,329	Re: Wiring LED light bar Are You using a separate battery for 12v? Regardless of the source, use a relay wired like below to switch the +12v On/Off with your 36v key switch: This is the 36v relay you need: https://www.mouser.com/ProductDetail...g3TKX2%2f0A%3d Last edited by Sergio; 05-15-2018 at 08:49 PM.. Reason: Relay Information.

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05-15-2018, 09:55 PM	#6
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30	Re: Wiring LED light bar Currently just running through two of the batteries, not a dedicated battery. The relay I’m using just came with the harness. I’ll look into the difference between the two and likely purchase one that you mentioned. Thanks again, excellent info.
joop1881 Not Yet Wild Join Date: Apr 2018 Posts: 30

05-15-2018, 10:02 PM	#7
Sergio Gone Wild Join Date: Sep 2012 Location: Charlotte, NC Posts: 9,329	Re: Wiring LED light bar You can keep using your existing 12v relay. Just disconnect the wire that goes to your +12v battery connection and run it though the contacts of that 36v relay. That way when your turn the key switch OFF it will interrupt the +12v power to any/all accessories you have. If You read around the site you probably already know that tapping 2 batteries will be an issue if you use your accessories a lot.

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