Connecting switch to relay to lights - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 15 Old 04-20-2018, 04:36 PM Thread Starter
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Connecting switch to relay to lights

I'm still a bit confused about how to wire a switch to relay to lights.

I don't want to tap into an existing power source. I understand relay 30 goes to battery. Can I also have switch Power go straight to battery?


I'm going to use this switch and a 40 amp relay. The switch is rated for 5A.

https://www.amazon.com/Ulincos-Latch.../dp/B019WRH3OC
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post #2 of 15 Old 04-20-2018, 05:12 PM
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The first thing that catches my eye is the 10 amp wire. If it shorts out, it will burn before the 20 amp fuse blows.

2008 Unlimited Rubicon Automatic
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post #3 of 15 Old 04-20-2018, 05:36 PM Thread Starter
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Quote:
Originally Posted by ronjenx View Post
The first thing that catches my eye is the 10 amp wire. If it shorts out, it will burn before the 20 amp fuse blows.
Right. That's just an example.
The diagram is from here:

https://www.extremelights.co.za/blog...oad-led-lights

I'm using 12AWG wire/40A fuse/40 A dual 87 relay/60W LED lights

Every diagram I've seen connects switch Power to some existing source. Was wondering if right to have batt + to relay 30 AND switch Power.

Last edited by jkx; 04-20-2018 at 05:48 PM.
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post #4 of 15 Old 04-20-2018, 05:45 PM
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The switch power can come directly from the battery, with a fuse near the battery.

2008 Unlimited Rubicon Automatic
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post #5 of 15 Old 04-20-2018, 05:49 PM Thread Starter
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Quote:
Originally Posted by ronjenx View Post
The switch power can come directly from the battery, with a fuse near the battery.

40A fuse ok?
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post #6 of 15 Old 04-20-2018, 06:22 PM
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Quote:
Originally Posted by jkx View Post
40A fuse ok?
Are we still referring to the circuit for the switch?

2008 Unlimited Rubicon Automatic
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post #7 of 15 Old 04-20-2018, 06:41 PM Thread Starter
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Quote:
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Quote:
Originally Posted by jkx View Post
40A fuse ok?
Are we still referring to the circuit for the switch?
Yes
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post #8 of 15 Old 04-20-2018, 06:53 PM
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The switch controls the relay coil. The coil draws very low amperage.
So, the fuse can be small; larger than what the coil draws, and smaller than what the switch and switch wires can safely carry.

The fuse for the light circuit can be much larger; larger than what the lights will draw, and smaller than what the light wires can safely carry.

Do you see the relationships among load, wires, and fuse?

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Last edited by ronjenx; 04-20-2018 at 06:55 PM.
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post #9 of 15 Old 04-20-2018, 08:43 PM Thread Starter
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Quote:
Originally Posted by ronjenx View Post
The switch controls the relay coil. The coil draws very low amperage.
So, the fuse can be small; larger than what the coil draws, and smaller than what the switch and switch wires can safely carry.

The fuse for the light circuit can be much larger; larger than what the lights will draw, and smaller than what the light wires can safely carry.

Do you see the relationships among load, wires, and fuse?
Understood.

Let me ask this though. Is it ok to run 12AWG wire throughout the whole project?

Also, being that I'm connecting switch power straight to the battery, should the fuse still be small there? How small?

Last edited by jkx; 04-21-2018 at 04:30 AM.
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post #10 of 15 Old 04-21-2018, 08:30 AM
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Look at the load on the lights. This and the length of wire would determine how big the wire needs to be and the fuse size. 12 gauge for lights seems high to me. Generally I would think you would be looking at a 10 or 15 amp fuse.

The example shown is wired with a relay because they are coming off the ignition circuit and running this way will shut off the lights when you sit off the vehicle. The relay isolates the load from the ignition circuit so not to overload it. Running strait of the battery will allow you to run the lights with the key in the off position.

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post #11 of 15 Old 04-21-2018, 09:36 AM
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That diagram is pretty much how the SPod works correct? All the power for the SPod comes from two wires (+/-) off the battery.

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post #12 of 15 Old 04-21-2018, 09:38 AM
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Ya it is just a relay box.

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post #13 of 15 Old 04-21-2018, 10:59 AM Thread Starter
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Quote:
Originally Posted by thedirtman View Post
Look at the load on the lights. This and the length of wire would determine how big the wire needs to be and the fuse size. 12 gauge for lights seems high to me. Generally I would think you would be looking at a 10 or 15 amp fuse.

The example shown is wired with a relay because they are coming off the ignition circuit and running this way will shut off the lights when you sit off the vehicle. The relay isolates the load from the ignition circuit so not to overload it. Running strait of the battery will allow you to run the lights with the key in the off position.

Would it be a problem to use 12 gauge?

60W LED fog lights.
Length is just as much you would use to install fog lights to switch in cabin with relay.
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post #14 of 15 Old 04-21-2018, 08:05 PM
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No, there would not be an issue with using 12 gauge. Bigger is better then too small. looks like a 10 amp fuse would do the job.

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post #15 of 15 Old 04-21-2018, 08:13 PM Thread Starter
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Thanks guys
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