new tachometer wiring help

[MrMcTavish]

I have a project gs700/750e (700e frame with a 83 750 engine) that I've been working on and I'm just finishing up the wiring. The motor for the tach on the stock gs700 gauges isn't working like it should and since I had one laying around, I will be replacing it a 93 gsxr gauge set. Most of the wiring was straight forward. Almost all the wire colors carried over for everything. Everything except the tachometer. now for my stock gauges there are 3 wires as follows:

orange - 12v power
Blk/wht - ground
brown - signal

now the gsxr has 3 wires as well.
org/gn - 12v power
blk/wht - ground
red/blk - which I'm assuming is a signal

Now i wired it up like this and once I turned the ignition on, the revs shot up to 8k and as the bike sat there(not running) the revs started to climb up and down to 12k. I've looked all over gsxr sites for some sort of wiring for the bike but it seems like no one has it.

Any ideas on what could be wrong. I will include pictures once I have a chance. Could it be just a bad tach motor in this gauge or is the red/black wire sending a 12v power as well? Any help is greatly appreciated

***SOLVED*** see last post for correct wires

 

[eil]

What model '93 GSX-R? Maybe one of these? http://www.manualedereparatie.info/categorii/suzuki.html

I looked at the service manual for a 93-98 GSX-R 1100W and there are some wiring diagrams in there. They're showing:

Black with White tracer as the ground
Orange (on the tach side), or Orange with Green tracer on the harness side as +12V
Black with Red tracer going into the ignitor.

I guess it's possible that the ignitors from two different bikes could be putting out different signals to the tachs.

If it were me, I would swap the orange and red wires just to see what happens. (I highly doubt this would blow up your gauge, but don't hold me accountable if it does. )

 

[posplayr]

I have a project gs700/750e (700e frame with a 83 750 engine) that I've been working on and I'm just finishing up the wiring. The motor for the tach on the stock gs700 gauges isn't working like it should and since I had one laying around, I will be replacing it a 93 gsxr gauge set. Most of the wiring was straight forward. Almost all the wire colors carried over for everything. Everything except the tachometer. now for my stock gauges there are 3 wires as follows:

orange - 12v power
Blk/wht - ground
brown - signal

now the gsxr has 3 wires as well.
org/gn - 12v power
blk/wht - ground
red/blk - which I'm assuming is a signal

Now i wired it up like this and once I turned the ignition on, the revs shot up to 8k and as the bike sat there(not running) the revs started to climb up and down to 12k. I've looked all over gsxr sites for some sort of wiring for the bike but it seems like no one has it.

Any ideas on what could be wrong. I will include pictures once I have a chance. Could it be just a bad tach motor in this gauge or is the red/black wire sending a 12v power as well? Any help is greatly appreciated

For suzuki pretty much universally
O/G is the SIGNAL power circuit (on with the IGN switch; this is actually the same as O it has just come through the fuse box)
and B/W is ground.

Hook those two up with nothing on the R/B ; you should read zero.
If not probably then
try and ground the R/B going into the gauge and see if it reads zero.

If no on both counts the gauge is probably bad.

You have already tried to run it with the R/B connected and which should have worked so again guessing the gauge is bad.

 

[MrMcTavish]

What model '93 GSX-R? Maybe one of these? http://www.manualedereparatie.info/categorii/suzuki.html

I looked at the service manual for a 93-98 GSX-R 1100W and there are some wiring diagrams in there. They're showing:

Black with White tracer as the ground
Orange (on the tach side), or Orange with Green tracer on the harness side as +12V
Black with Red tracer going into the ignitor.

I guess it's possible that the ignitors from two different bikes could be putting out different signals to the tachs.

If it were me, I would swap the orange and red wires just to see what happens. (I highly doubt this would blow up your gauge, but don't hold me accountable if it does. )

I did find a very useful manual on there thank you for that. The manual says that the black with red tracer(gsxr) comes from the ignitor's CPU. Unfortunately the wiring diagram I have for the gs700 isn't too clear on the wiring for the tach. In the picture from what I believe to be the tach motor are three wires: Orange, Black/white and a black/yellow. I'm about to go out and have a quick look at the harness on the bike and try to trace some wires.
You guys have been very helpful thank you. Sorry it took me so long to get back

 

[MrMcTavish]

I'd just figured that I would update this to help anyone who was looking to do this swap in the future or a similar one.

orange/green --> orange
black/white ----> black/white
black/red ------> brown

although when I was testing it the tach shot up, when I actually go the bike running to test it, the tach worked just fine. So the above wires are the correct wires for gs > gsx gauge conversion