2 switches, 1 light question
 

Is it possible to wire 2 switches to 1 light?

I have flush mounted cubes mounted in my rear bumper, They are wired directly to my reverse light harness. Is it possible for me to wire a second switch to these lights that I can turn off and on as I needed?

I tried to look online for a diagram to do this but had no luck, was hoping i could find help here.

Thanks in advance

Yes, you'd just need to install a diode so you don't back feed into the reverse lights.

I can draw something up, standby

Attachment 2070

This is assuming you use appropriate fuses on the 12v power source, as well as probably a good idea on your R trigger

You could just use a 5 pin relay. By wiring the relay up to control the lights, you could splice your reverse lights into the normally closed contact on the relay, so when the switch is off the lights will come on with your reverse lights. When you switch them on manually the relay will close the normally open contact, powering on the lights. At the same time, the normally closed contact will open, preventing back feed into your reverse lights, eliminating the need for a diode.

Wouldn't that mean the load of your lights are on the factory reverse wiring?


85 switch
86 ground
30 output to lights
87 switch
87A reverse (powers 30 when off)

So just to make sure I get it right Patman

A) "30" is connected directly to the battery
B) "85" is connected to a "Switch harness" and the power from the reverse lights
C) "86" is grounded
D) "87" is to the lights, which are grounded


05RedFX4

do you have a drawing of your concept?

Or flip it and you load runs through your switch, which defeats the benifit of the relay

30 output to lights
86 ground
85 Reverse
87 12v ignition
87A switch 12v

My numbers are ISO Standard relay callouts

30 should be ignition 12v (fused)
85 switched ignition 12v AND Reverse trigger with inline diode
86 ground
87 to lights

https://cimg7.ibsrv.net/gimg/www.f15...12056a10fb.jpg


Basically you would wire it up as follows,

pin 30 to your cube lights

pin 87a to your reverse light trigger

pin 87 to switched/fused 12v feed

pin 86 to secondary switch

pin 85 to ground

by wiring as above your cube lights will come on with your reverse lights like they do now, and when you flip the switch you can power them on manually and not back feed your reverse lights.

Okay awesome, can I just buy any "Inline Diode" or is there a specific one I need?

Awesome! Thank you sir!

pins 30, 87, 87a are not polarity specific. You can send 12v dc thru them in either direction. They were designed to have pin 30 as input and 87, 87a as selectable outputs. But you can use it as a dual selectable input with a single output by using 87, 87a as inputs and 30 as output.

Now pins 85, 86 are polarity specific. If you feed dc current into the coil the wrong way, it will not move the contacts and nothing happens. so make sure you get the polarity correct on 85 and 86.

85 and 86 are interchangeable as long as one receives a power and one receives a ground


Your 30-87-87A complete the circuit to eachother, but you can send power through, or make a ground available through the relay if you wanted you control on the ground side