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Brake Switch Wiring

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Falco
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PostPosted: 19:30 - 25 Aug 2019    Post subject: Brake Switch Wiring Reply with quote

I'm preparing to set up switched live relay on a CB500S, but I am unsure of the wiring colours in the switch.

The bike side of the switch has a green/ yellow striped wire and a brown/black striped wire and the switch side has a green/yellow striped wire and a white wire with a thin green line.

The wiring diagram shows a brown/black wire going to the switch and a yellow/green wire from the switch going to the brake and tail light.

So, presumably one wire is the power and the other the switched live to complete the circuit, but, which is which? I vaguely recall reading somewhere that the brown/black is switched live for Honda, which would make the green/yellow the power. Can anyone confirm (or deny) that?
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Pete.
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PostPosted: 19:58 - 25 Aug 2019    Post subject: Reply with quote

The brown and black is a feed from the 15a fuse 3 to the rear brake light switch, turn signal relay and horn, so you can safely tap that for your relay feed.
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Falco
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PostPosted: 23:59 - 25 Aug 2019    Post subject: Reply with quote

Thanks Pete.
If I wanted to tap into the wiring on the switch side (to avoid messing with the harness itself) would the green/white wire be one to tap into?
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Pete.
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PostPosted: 08:35 - 26 Aug 2019    Post subject: Reply with quote

Falco wrote:
Thanks Pete.
If I wanted to tap into the wiring on the switch side (to avoid messing with the harness itself) would the green/white wire be one to tap into?


No, the green/white feeds the light so it's only live when the brake is pressed. the brown/black feeds the switch, it's always live with the ignition on.
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Falco
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PostPosted: 23:59 - 26 Aug 2019    Post subject: Reply with quote

Apologies if I am being dense here, but doesn't the green/yellow go from the switch to the brake light (it looks like it on the diagram), the brown/black feeds the switch, but connects to the green/white on the "switch" side of the connector, so the green/white is also the switched live (just on the other side of the connector)?
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sickpup
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PostPosted: 00:16 - 27 Aug 2019    Post subject: Reply with quote

Falco wrote:
Apologies if I am being dense here, but doesn't the green/yellow go from the switch to the brake light (it looks like it on the diagram), the brown/black feeds the switch, but connects to the green/white on the "switch" side of the connector, so the green/white is also the switched live (just on the other side of the connector)?


Yes it is a switched live, switched by the brake light switch so will only be live when you pull the brakes. So if you want the relay to be energised only when you pull the brake thats the one to go for, if not listen to Pete.
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Falco
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PostPosted: 22:57 - 09 Sep 2019    Post subject: Reply with quote

sickpup wrote:
Falco wrote:
Apologies if I am being dense here, but doesn't the green/yellow go from the switch to the brake light (it looks like it on the diagram), the brown/black feeds the switch, but connects to the green/white on the "switch" side of the connector, so the green/white is also the switched live (just on the other side of the connector)?


Yes it is a switched live, switched by the brake light switch so will only be live when you pull the brakes. So if you want the relay to be energised only when you pull the brake thats the one to go for, if not listen to Pete.



Both wires entering the switch can't be energised by the switch though.
If the brown/black is carrying power when the ignition is live, on the "bike" side of the connector block, it must also be carrying power on the "switch" side. So the question I was actually asking (as opposed to the one you answered) was which of the wires on the "switch" side of the block to use.
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Pete.
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PostPosted: 23:55 - 09 Sep 2019    Post subject: Reply with quote

The brown and black.
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weasley
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PostPosted: 09:04 - 10 Sep 2019    Post subject: Reply with quote

A cheap multimeter is invaluable in jobs like this.
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Falco
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PostPosted: 14:14 - 10 Sep 2019    Post subject: Reply with quote

Pete. wrote:
The brown and black.


There is no brown/black on the switch side, only the green/white and green/yellow.

weasley wrote:
A cheap multimeter is invaluable in jobs like this.


agreed, but the results I am getting don't make much sense to me. When I test between the green/white and the battery -ve, there is no reading until I press the brake pedal, but there is a continual voltage (when the bike is on) between the green/yellow and the -ve.

I thought that the green/yellow was between the switch and the brake light (that is how it is shown on the wiring digram), but if that is the case, why is it getting power without the pedal being pressed?
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Islander
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PostPosted: 15:11 - 10 Sep 2019    Post subject: Reply with quote

Green and yellow is the live feed to the switch then. Green and white is the switched feed to the light.

Makes perfect sense really.

You want to take your relay feed from the green and yellow.
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Pete.
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PostPosted: 00:14 - 11 Sep 2019    Post subject: Reply with quote

Falco wrote:
Pete. wrote:
The brown and black.


There is no brown/black on the switch side, only the green/white and green/yellow.



So there's no brown/black except for the one you said there was here:

Falco wrote:


The bike side of the switch has a green/ yellow striped wire and a brown/black striped wire


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Meatybeaty
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PostPosted: 07:05 - 11 Sep 2019    Post subject: Reply with quote

Will this help
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Islander
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PostPosted: 08:49 - 11 Sep 2019    Post subject: Reply with quote

Pete. wrote:


So there's no brown/black except for the one you said there was here:

Falco wrote:


The bike side of the switch has a green/ yellow striped wire and a brown/black striped wire



FFS.

Well spotted sir Laughing
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Easy-X
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PostPosted: 11:36 - 11 Sep 2019    Post subject: Reply with quote

Reading all this I'm a bit confused...

Do you have a 'thing' that needs power. It's high current so you don't want it to draw power from the ignition circuit directly but instead get power from the battery and control when it gets power via a relay.

So relay has a coil side (which will be connected to the ignition controlled power) and a switch side (which will feed power from the battery to the 'thing')

I think that's what I'm reading Smile

Based on the kindly provide circuit diagram I would suggest connecting the coil side of relay to Brown/Black (ignition controlled power) and ground (direct to frame or Green on the diagram)

The chosen 'thing' will have it's ground connection either direct to frame or the battery negative terminal (I wouldn't recommend connecting to any Green wires if it wants high current.) and its positive feed from one of the relay switched terminals. The remaining, unconnected relay switch terminal will be connected to the battery either after the 30A fuse (Red wire) or direct to the battery positive terminal via an independent fuse.
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Pete.
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PostPosted: 12:56 - 11 Sep 2019    Post subject: Reply with quote

I think I've just figured out where the confusion is.

Falco is using the term 'switch' when he should be using 'loom connector'. It's the equivalent of calling a domestic wall socket 'the house side of the hoover' Doesn't make much sense does it?

Suitably edited, Falco's post makes perfect sense:

Falco wrote:

The bike side of the LOOM PLUG has a green/ yellow striped wire and a brown/black striped wire and the switch side OF THE PLUG has a green/yellow striped wire and a white wire with a thin green line.

The wiring diagram shows a brown/black wire going to the switch and a yellow/green wire from the switch going to the brake and tail light.

So, presumably one wire is the power and the other the switched live to complete the circuit, but, which is which? I vaguely recall reading somewhere that the brown/black is switched live for Honda, which would make the green/yellow the power. Can anyone confirm (or deny) that?


So the answer at face value is plug in the loom connector and confirm that the green/yellow passes straight through and the black/brown turns into green/white to feed the brake light switch. If it does, you can tap the green/white to feed your relay if you want, though black/brown is still the favoured option otherwise if your brake light switch ever needs changing or just un-plugging, you can't because you've made a permanent connection the wrong side of the plug. Another consideration is that brake light sub-looms often have much thinner wires than the bike side of the loom plug. That makes them fragile and prone to breaking especially if soldered.

By the way, a switched live ALWAYS only refers to the bike's main live feed which is turned on and off by the ignition switch. Don't confuse it with the brake light feed from the brake light switch - that's a switched feed, not a switched live.
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132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy
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Easy-X
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PostPosted: 21:18 - 11 Sep 2019    Post subject: Reply with quote

I just read the initial post and didn't read the actual thread title Doh!
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Falco
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PostPosted: 22:14 - 19 Sep 2019    Post subject: Reply with quote

Pete. wrote:
I think I've just figured out where the confusion is.

Falco is using the term 'switch' when he should be using 'loom connector'. It's the equivalent of calling a domestic wall socket 'the house side of the hoover' Doesn't make much sense does it?

Suitably edited, Falco's post makes perfect sense:

Falco wrote:

The bike side of the LOOM PLUG has a green/ yellow striped wire and a brown/black striped wire and the switch side OF THE PLUG has a green/yellow striped wire and a white wire with a thin green line.

The wiring diagram shows a brown/black wire going to the switch and a yellow/green wire from the switch going to the brake and tail light.

So, presumably one wire is the power and the other the switched live to complete the circuit, but, which is which? I vaguely recall reading somewhere that the brown/black is switched live for Honda, which would make the green/yellow the power. Can anyone confirm (or deny) that?


So the answer at face value is plug in the loom connector and confirm that the green/yellow passes straight through and the black/brown turns into green/white to feed the brake light switch. If it does, you can tap the green/white to feed your relay if you want, though black/brown is still the favoured option otherwise if your brake light switch ever needs changing or just un-plugging, you can't because you've made a permanent connection the wrong side of the plug. Another consideration is that brake light sub-looms often have much thinner wires than the bike side of the loom plug. That makes them fragile and prone to breaking especially if soldered.

By the way, a switched live ALWAYS only refers to the bike's main live feed which is turned on and off by the ignition switch. Don't confuse it with the brake light feed from the brake light switch - that's a switched feed, not a switched live.



Embarassed Yeah, that was poor word choice on my part, apolgies for the confusion. I figured it was probably the green/white, but I tapped the switched live on the bike side (the brown/black) of the plug, just in case.
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