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Aux car light switch setup?

MillerXJ51

Feb 19, 2015
3
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Feb 19, 2015
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So I am by no means an electrician so when it comes to wiring up lights i always have a hell of a time, so this time I decided to come here first! I am going to be adding a fair amount of new LED lights to my Cherokee. I'm using anywhere from 18watt LED to a 300watt LED Bar and several sizes in between mostly 27watt. I have 8 blue LED rocker/toggle switches that I want to use they are the 5 pin dual LED back light style. Here is my wiring diagram i put together can someone who knows what they are doing please take a look and see if there are any issues? Thanks

<a href="http://s1372.photobucket.com/user/millergt1551/media/LEDLIGHTS WIRE_zpsdk5nzuwm.png.html" target="_blank"><img src="http://i1372.photobucket.com/albums/ag349/millergt1551/LEDLIGHTS WIRE_zpsdk5nzuwm.png" border="0" alt=" photo LEDLIGHTS WIRE_zpsdk5nzuwm.png"/></a>

Also can I run them in a parallel or some kind of circuit to save excess wires?

<a href="http://s1372.photobucket.com/user/millergt1551/media/LEDLIGHTS WIRE ROCKER_zpsdai81uae.png.html" target="_blank"><img src="http://i1372.photobucket.com/albums/ag349/millergt1551/LEDLIGHTS WIRE ROCKER_zpsdai81uae.png" border="0" alt=" photo LEDLIGHTS WIRE ROCKER_zpsdai81uae.png"/></a>
 

Arouse1973

Adam
Dec 18, 2013
5,178
Joined
Dec 18, 2013
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5,178
Hello
Can't see anything major just a few points. You need to indicate the 0V battery connection is connected to something. Question: Why 30A fuse, seems quite high also can't you just use the switch without a relay the reason I say this is otherwise you will need some flyback voltage suppression for the relay and possibly the switch. If you post the data sheet for the switches and relay we can check properly.
Cheers
Adam
 

MillerXJ51

Feb 19, 2015
3
Joined
Feb 19, 2015
Messages
3
Hello
Can't see anything major just a few points. You need to indicate the 0V battery connection is connected to something. Question: Why 30A fuse, seems quite high also can't you just use the switch without a relay the reason I say this is otherwise you will need some flyback voltage suppression for the relay and possibly the switch. If you post the data sheet for the switches and relay we can check properly.
Cheers
Adam
What kind of data sheet do you need? And the high 30amp fuse is just what was recommended by a friend for automotive wiring.
 

MillerXJ51

Feb 19, 2015
3
Joined
Feb 19, 2015
Messages
3
Hello
Can't see anything major just a few points. You need to indicate the 0V battery connection is connected to something. Question: Why 30A fuse, seems quite high also can't you just use the switch without a relay the reason I say this is otherwise you will need some flyback voltage suppression for the relay and possibly the switch. If you post the data sheet for the switches and relay we can check properly.
Cheers
Adam
It was fairly cheap so this is about all the info I have on it...
HOT SYSTEM™ 12V 20A LED Illuminated Car Led Switch Waterproof

Specifications:
- Color: Blue
- Lamp: led lamp
- Material: Plastic
- Switch function: On-off
- Rated voltage: 12VDC 20A
- Operating temperature: -25 to 85
- Type: 12V LED illuminated car led switch
 

Arouse1973

Adam
Dec 18, 2013
5,178
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Dec 18, 2013
Messages
5,178
So you can do a way with the relays then. Each switch will be passing 6 Amps if you use two 36 Watt LEDs.
Thanks
Adam
 

Kiwi

Jan 28, 2013
471
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Jan 28, 2013
Messages
471
First thought was "way too many fuses on the switching circuits".
Suggest fit a 5A switch common supply fuse instead of the 30A fuse shown in the second diagram. Delete the fuses between the switches and relay windings.
If you are concerned about shorts in the switching wires to the relays, swap the 30A fuses for 5A ones and change the switch common supply fuse to 10A.

Not sure about the connections on the switches. Doesn't look right.

I would suggest that you do use relays. They take load of the switches. They also allow the wiring between the battery and light to be as short as possible. The heavy power wires can go directly from the battery to relay to lights, without have to go into the dash area.

Positive of switch circuit is usually connected to relay 86 and negative to 85.
I also suggest using relays with resistor or diode protected windings on all modern vehicles. Too many electronic modules that could be zapped by a relay spike. Also helps protect switch contacts from arcing.
Individually fusing the battery feed to terminal 30 on each relay is a good idea. You will lose only a couple of lights if a fuse blows. All fuses should be located as close to the battery as possible.

The 300w light bar could draw about 25A. Select a fuse and holder than can supply this current continuously. I know mini relays can be rated at up to 40A, but for a 25A load, I would prefer to use a larger 70A relay, rather than a standard mini relay.
 

Arouse1973

Adam
Dec 18, 2013
5,178
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What heavy wiring you thinking of? 3 m @ 25 Amps with 5% loss = 10 AWG which is 2.5 mm diameter solid core. Use low voltage thin multi strand wire to keep diameter down. If your run is only 2 m you could go down to 11 AWG and if it's only 1 m then 14 AWG will be fine. You can use the relays if you want but seem overkill to use a 25 Amp switch to control a relay coil.

We don't have relays in our house wiring connected to each power socket do we? We rate the cable and switches correctly to save cost.

It's up to you.

Adam
 
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