So, you thought I was done with wiring diagrams? So did I. As it turns out, the wiring for the switches themselves is a little more complex than I can handle without putting something down on paper. The previous wiring diagram included a simplified version of the switches, but there is much more to take into account.
Each switch has five wires:
1. Illumination positive
2. Illumination negative
3. Indicator light and switch positive
4. Indicator light negative
5. Switch negative (relay wire)
Sorting the wires out was done with this guide and a multimeter to double-check. If your lights are burnt out, however (as many are) the multimeter won’t give you the readings you’re looking for.
The switch is a double pole single throw type (DPST), which means one switch operates two circuits - the relay and the indicating light are operated separately by the one switch. It looks something like this on the inside:
Take the wire colours indicated with a grain of salt - Subaru seems to switch the colours on every model. This diagram is looking at the back of the connector like this:
Okay, now that we know what each of the five wires is, we need to know where to connect them. We will need seven wires coming up to the switches to meet with the 15 wires of the switches. These wires will be:
1. New high beam relay
2. Spotlight relay
3. Foglight relay
4. Magnetic spotlight relay
5. Switched ground wire (connected to the old high beam switch)
6. Illumination positive power
7. Constant ground
It all comes together like this:
The spot light and fog light switches are wired identically, with the exception of the positive relay/indicator wire. The high beam switch is just a little different.
See what I mean about it being more than I can keep in my head at one time? Having a diagram for (relatively) complex circuits like this really keeps you from making a mistake when wiring it all together. Making wiring mistakes can often lead to the magical wiring smoke escaping from your wires when you turn the key that first time, and lights won’t function without magical wiring smoke!
I will be making constant reference to this diagram and the diagram of the whole system while I’m hooking everything up. Stay tuned for more, as soon I’ll actually be finding the correct wires to tap into under the dashboard for all these connections!
Each switch has five wires:
1. Illumination positive
2. Illumination negative
3. Indicator light and switch positive
4. Indicator light negative
5. Switch negative (relay wire)
Sorting the wires out was done with this guide and a multimeter to double-check. If your lights are burnt out, however (as many are) the multimeter won’t give you the readings you’re looking for.
The switch is a double pole single throw type (DPST), which means one switch operates two circuits - the relay and the indicating light are operated separately by the one switch. It looks something like this on the inside:
Take the wire colours indicated with a grain of salt - Subaru seems to switch the colours on every model. This diagram is looking at the back of the connector like this:
Okay, now that we know what each of the five wires is, we need to know where to connect them. We will need seven wires coming up to the switches to meet with the 15 wires of the switches. These wires will be:
1. New high beam relay
2. Spotlight relay
3. Foglight relay
4. Magnetic spotlight relay
5. Switched ground wire (connected to the old high beam switch)
6. Illumination positive power
7. Constant ground
It all comes together like this:
The spot light and fog light switches are wired identically, with the exception of the positive relay/indicator wire. The high beam switch is just a little different.
See what I mean about it being more than I can keep in my head at one time? Having a diagram for (relatively) complex circuits like this really keeps you from making a mistake when wiring it all together. Making wiring mistakes can often lead to the magical wiring smoke escaping from your wires when you turn the key that first time, and lights won’t function without magical wiring smoke!
I will be making constant reference to this diagram and the diagram of the whole system while I’m hooking everything up. Stay tuned for more, as soon I’ll actually be finding the correct wires to tap into under the dashboard for all these connections!
- mounting the fog lights
- building the removable light bar
- wiring part 1: new bulbs in OEM foglight switches
- wiring part 2: the plan (wiring diagrams)
- wiring part 3: switches (more diagrams)
- wiring part 4: parts and pieces
- wiring part 5: under the dashboard
- wiring part 6: fuse and relay box
- wiring part 7: prepping the lights
- wiring part 8: final connections
- wiring part 9: aiming the lights
- wiring part 10: updates and fixes
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