wire routing question(s)

[Sam 78 GS750]

Where does the oil pressure switch get routed? Does it go through the starter grommet and then out the back and through the left side cover?

If it doesn't go through the starter grommet, which wire does? I labeled my wiring really well, but this is one piece I'm missing...

 

[Steve]

I don't have a 750, but my 850s were based on the 750. And, I have stayed at a Holiday Inn recently. :-\\\

The wire to the oil sensor just lays on the top of the transmission and does not get anywhere near the starter.

What "grommet" to you have on the starter? My 850s don't have anything resembling a grommet on the starter wire.

I think a picture would help with the situation. If you can't post one here, send it to my e-mail. Info available by clicking on my username.

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[Sam 78 GS750]

Hard to see in the fiche, but #38 here --->https://www.partzilla.com/catalog/suzuki/motorcycle/1978/gs750ec/crankcase
I'll try to get a picture later.

I remember slicing the grommet to get a wire out of there, I just can't remember what wire it was... I labeled everything meticulously when taking it apart, but I seemed to miss labeling this detail. I'm pretty sure there's no ground wire for the starter. It just grounds internally and through the mounting bolts to the engine, right? The hot for the starter is the 8 gauge that comes in from the back.

I can't for the life of me figure out what wire runs through there... Only thing I could think of is the oil pressure switch, since it's right there...

 

[Steve]

OK, it took a bit to find #38, but I see it now. The only wire I know of that goes through there is the #8 wire for the starter. On the 850s, there is also a vent tube from the secondary drive, and there is no grommet, which is why I was not recognizing what you were talking about. There is a slot in the wall around the starter and the starter cover bridges over the top of the slot, but it's been wide open on any of the shafties I have worked on.

Back to your original question: Do you have the wire and don't know where to run it? Or are you trying to find the wire to be able to put it on the switch? If you have the wire and see where it clips onto the pressure switch, that's all you need. The wire just lays on the top of the transmission and leads back to where it disappears into the harness. There might be a clip or two along the way to keep it next to the starter wire.

.

 

[Sam 78 GS750]

Back to your original question: Do you have the wire and don't know where to run it? Or are you trying to find the wire to be able to put it on the switch? If you have the wire and see where it clips onto the pressure switch, that's all you need. The wire just lays on the top of the transmission and leads back to where it disappears into the harness. There might be a clip or two along the way to keep it next to the starter wire.

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I have the wire, and I'm not sure where to run it.
...and if it doesn't go through the starter cavity, I'm trying to find out if I'm missing the wire that does route through there by way of the grommet.
Wiring diagram is no help here, and I poured through my Suzuki manual and the Haynes trying to find a clear picture with no luck...

 

[hannibal]

You're right Sam. It goes through the starter grommet and runs towards the back of the bike with the starter lead wire and stator wires.

 

[Sam 78 GS750]

Awesome, thanks guys! I'll run the oil pressure wire through the grommet. One more thing I can button up.
I was more concerned about missing a wire than the routing on that particular wire, but you both confirmed I'm good and nothing else should go to the starter itself.

 

[Steve]

I'll be headed out to the shop in a few minutes, I'll try to get a picture of what it looks like on a 1000G.

.

 

[Steve]

OK, it's been a bit more than "a few minutes", but here's a picture for you.

This is on an '80 1000G. Carbs are removed (not just for this photo), so access is great.
Note the oil sensor wire and its routing, it's nowhere near the starter wire port (which has no grommet).

Also visible, on the left side, is the secondary drive vent, with its small tube that runs under the starter cable and into the starter cavity.

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[hannibal]

On our GS750, the oil sensor wire goes into the starter cavity through a grommet (where your starter cable goes in). On the rear of the starter cavity, the oil sensor wire exits the cavity. Our starter cable enters the cavity with the oil sensor wire at the rear. The wires leave the cavity and run along the edge of the left side cover (that covers the transmission output gear).

I suspect the difference is not between the GS750 and GS1000, but between chain driven and shaft driven models.

 

[allojohn]

On our GS750, the oil sensor wire goes into the starter cavity through a grommet (where your starter cable goes in). On the rear of the starter cavity, the oil sensor wire exits the cavity. Our starter cable enters the cavity with the oil sensor wire at the rear. The wires leave the cavity and run along the edge of the left side cover (that covers the transmission output gear).

Confirmed.

 

[Brendan W]

OK, it's been a bit more than "a few minutes", but here's a picture for you.

This is on an '80 1000G. Carbs are removed (not just for this photo), so access is great.
Note the oil sensor wire and its routing, it's nowhere near the starter wire port (which has no grommet).

Also visible, on the left side, is the secondary drive vent, with its small tube that runs under the starter cable and into the starter cavity.

.

Is that sensor wire on an induction loop around the starter cable?
If it is, might it be to calm down the sensor current at startup and reduce arcing or have I just lost the plot entirely

 

[roeme]

Is that sensor wire on an induction loop around the starter cable?
If it is, might it be to calm down the sensor current at startup and reduce arcing or have I just lost the plot entirely

Lost it entirely I'd say. That's a small bendable retainer.

 

[Sam 78 GS750]

Thanks for the confirmation everyone! I was definitely scratching my head on this one...

 

[Brendan W]

Lost it entirely I'd say. That's a small bendable retainer.

I'm going back to the old coffee...................