LED light bar 3 position switch on 2002 Dakota - DODGE DAKOTA FORUM - FORUM AND OWNERS CLUB!
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Lighting Dodge Dakota Lighting: Headlights, Tail Lights, HID's, LED's

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  #1  
Old 06-11-2019, 04:26 AM
ScanMan79 ScanMan79 is offline
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Question LED light bar 3 position switch on 2002 Dakota

I installed a couple of light bars on my '02 Dakota with the intention of doing a little custom wiring only to find out that this truck does not have a fuse for the High Beams.

Okay here's what I was wanting to do. I wanted to hook up the lights via a 3-position switch on the dash that would allow me to have the light bars set up as follows.

Up = ON
Middle = Off
Down = On with High Beams

That way I could have the option when running in the desolate country where wildlife outnumbers the people exponentially I could run the LEDs but in the RARE times, I meet someone I can simply dim the lights without having to fumble around trying to hit the switch as fast as I can as not to blind them. I was going to do this via the High Beam fuse, but to my dismay, there isn't one and from what I've read they are controlled via the computer?!

I was curious if anyone knows a workaround that I could do to allow this kind of functionality? Also on a side note, is there a fix for interference caused by the light bars? Whenever I turn on the lights the radio is wiped out. Any thoughts and ideas would be greatly appreciated!

Thanks!
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Old 06-11-2019, 02:41 PM
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The headlights are powered by drivers in the Central Timer Module (CTM), but the CTM receives input from the multifunction switch (turn signal lever) to know when to power the high and low beams. Look for a red/orange wire coming from the multifunction switch, as this is the wire that tells the CTM when to power the high beams. Hopefully, you are using a relay to actually power the LED light bars - I don't know how much amperage you could run through this wire from the multifunction switch.

As far as noise interference from the light bars in the radio, a condenser/capacitor would probably take care of that, but I wouldn't know what type. You could probably check with a local audio installation shop to get suggestions on what to get.
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Old 06-12-2019, 01:47 AM
ScanMan79 ScanMan79 is offline
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Talking Thank you!

Thank you! Yes, all light bars are on their own circuit and have been run through relays. I'll go on the search for the elusive red/orange wire as soon as I have some spare time! I'm all excited to try it out. I was beginning to think it wasn't going to be possible with this truck. Thanks again!
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Old 06-12-2019, 02:28 AM
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Take a wire running to the high beam circuit.

Run that to one side of a SPDT Center-Off switch (a bat handled version is here ) . They also sell smaller versions which, since you're actually just switching a relay, would be plenty big enough. A sub mini example of a DPDT switch is here. Or one in between in size.

Run the other side to a switched-12V or constant-12V source (your choice).

Run the center to the coil of the relay running the light bar; ground the other side of the coil. (Say run to the 85 terminal on a Bosch relay, and ground the 86. Or vice versa.)

That'll give you what you want.

Caveat: Due to how toggle switches work inside, if you run the constant-12V to the TOP screw, the handle will need to be DOWN to have them on always. Just be prepared for that.

There's also rockers you can buy with that same scheme.

RwP
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