Bandit 400 dash wired into Katana 750 harness

scott s

Active Member
Working on a project that has Katana/GSX750F engine, suspension, etc, in a 1980 GS550 frame. I have '91 Bandit 400 gauges and idiot lights I plan on using.
I am now faced with mating the B400 wiring to the Kat750 harness.

The plugs are completely different. I have a wiring diagram for both and am studying what goes where. I will need back lights for the tach and speedo, a neutral light, oil pressure light, turn signal indicators and Hi-beam. I can forgo things like gas gauge, water temp, etc.

This the the Kat 750 plug.
 

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scott s

Active Member
Here's the Bandit 400 wiring diagram. Am I correct in thinking that the Black/Yellow is keyed power? I only see it going to one of the two coils and the ignitor.
Is it only supplying keyed power to the dash? Once I figure out the purpose/source for the B/Y on the Bandit 400 harness, I just need to get the same from the Kat harness and then find the corresponding wires for the oil pressure, hi-beam, N, turn, etc., right?
 

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B400

New Member
Fun stuff. I recently swapped my bandit 400 gauges for digital ones. I have a piece of paper scribbled with what the wires in my bandit 400 gauges do. Don't take this as gospel because my notes are rough and yours may be different so double check everything on the wiring diagram.

Negative (BW)
Power on (Grey)
Right turn (light green)
Left turn (black)
Tach (black/yellow)
High beam (yellow)
Temp (black/green (blue-ish)
Oil (green/yellow)
Neutral (blue/black)

Here's a photo of my scribbles.


Good luck.
 

scott s

Active Member
Yes, that pretty much matches what I came up with. The only ones I need are:

Ground - B/W black/white
Keyed power - GR gray
Tach - B/Y black/yellow
Turns - Black for LH and Light Green for RH
Neutral - LB blue/black
Hi-beam - Y yellow
Oil Pressure - G/Y green/yellow
Fused Power - OG orange/green

I won't be using the side stand switch or clutch switch (this is all going in a GS550 frame). If I just use a jumper for those two switches, will the turn signal/side stand relay in the 750 harness still supply the correct power and ground to make the neutral light work?

I studied the 750 diagram yesterday and all of the colors I need match up. I ordered a Bandit 400 harness to rob the plug from.

On the Bandit 400 diagram, OG is switched power from 10A fuse (4 Signal) for turn signal flasher, back brake switch, horn, front brake switch, side light switch and pilot lights. Neutral light is supplied via switched live from OG, LB is earth via the side stand diode to the neutral switch.

The 750 doesn't use a diode (or, if it does it's inside the turn signal/side stand relay....lower right in the 750 diagram). Sooo....if I just use a jumper to bypass the side stand switch and the clutch switch, will that relay still supply power to make the neutral light work?

 

scott s

Active Member
Edit: since the wiring and mount for the clutch safety switch is there, I picked up a genuine Suzuki switch and will use it. For only $12.86 shipped, I hit the easy button and added a little safety aspect.

I will still have to bypass the side stand switch.
 

Sonreir

Oregon
Should be easy to do and you can omit the clutch switch at the same time. Yellow/green from the right hand control to the striped wire on the solenoid that isn't the black/white one. Looks like black/yellow in the diagram?
 

B400

New Member
I bypassed the clutch switch but kept the side stand switch. I'm a bit of an idiot so its saved me a few times.
 

scott s

Active Member
The GS550 frame doesn't have a place for a side stand switch. Can you tell by looking at the diagram how the side stand switch works? And by that I mean does it make contact inside the switch when the side stand is down and the "plunger" is out, or does it break contact?
 

B400

New Member
I'm far from an expert but I believe it says it makes contact when it's pushed in and no contact when it's free.
 

Sonreir

Oregon
Hard to tell exactly, but it's going to do one of two things:

1.) Ground out the green wire from the relay when the side stand is up
2.) Or ground out the green wire from the relay when the side stand is up

I would start with grounding the green wire and if you can't get spark, unground it and cap it off.
 
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