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Author Topic: Brain farted and cut my fuel pump wiring need some help.  (Read 3693 times)

Offline natehimself

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Brain farted and cut my fuel pump wiring need some help.
« on: December 05, 2020, 02:57:46 PM »
So another cafe racer build of course.

Anyways, here I was cleaning the Bosch ABS wiring out of the harness to make more room and because the gas tank was already removed I mislabeled the fuel pump connector.

Chopped it right now.

So I have the brown common, white low gas light, and the yellow/green to the relay figured out.

What is the last wire and where does it go?
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  • '93 K11

Offline Laitch

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #1 on: December 05, 2020, 03:15:34 PM »
Quote from: natehimself on December 05, 2020, 02:57:46 PM
What is the last wire and where does it go?
What color is the wire?
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline natehimself

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #2 on: December 05, 2020, 03:28:00 PM »
Well I cant quite tell. On the gas tank side of the connector its yellow. On the harness side it appears to be yellow.
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Offline rbm

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #3 on: December 05, 2020, 04:14:59 PM »
Power should be Green/White, not Yellow/Green, and should come from Pin 87 of the Fuel Pump relay.  I don't think there is a Yellow/Green on the bike at all.  Double check your wiring.  The remaining wire is Yellow and it should go to the Auxillary Instruments connector.  This wire is totally optional and won't hinder operation of the motorcycle.
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Offline daveson

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #4 on: December 05, 2020, 04:16:24 PM »
Yep you don't need it.

Yellow is for the fuel level gauge, if you don't have a gauge, you don't need it.
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  • Victoria, Australia
  • Current; '85 K100RT~100,000km; four other bricks. Past; Vulcan 1500, V Star 650, KLX 250(dirt bike) TT250(dirt bike)

Offline natehimself

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #5 on: December 05, 2020, 05:19:30 PM »
Well I have some bad news for me then. The issue is somewhere else.

Thanks for the help.
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Offline daveson

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #6 on: December 05, 2020, 06:03:22 PM »
Have a quick check of what doesn't work, eg the headlight, or prob time to check the wiring diagram.

When you say yellow/green do you mean green/yellow, or after a clean green/white, or something like that?

Don't know if your model is RS or something else.
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  • Victoria, Australia
  • Current; '85 K100RT~100,000km; four other bricks. Past; Vulcan 1500, V Star 650, KLX 250(dirt bike) TT250(dirt bike)

Offline natehimself

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #7 on: December 05, 2020, 07:06:22 PM »
Headlights come on.

It is green/white.

Everything that you would expect to work when the key is in the ignition works(blinkers, horn, head lights) except I don't get the fuel pump. I also don't get the starter motor if I try and start it but I am honestly unsure if the starter needs that fuel pump to send a state before I can turn it over.

It is an RS.
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  • '93 K11

Offline natehimself

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #8 on: December 05, 2020, 07:07:59 PM »
Sorry. I mean an LT.
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Offline daveson

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #9 on: December 05, 2020, 07:26:55 PM »
That would be the plug to the tank, if it's a k100 lt, I thin??? Especially if the plug fits the tank connector, and fit for length with the tank installed.

Especially if you have a fuel gauge and it doesn't work.
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  • Victoria, Australia
  • Current; '85 K100RT~100,000km; four other bricks. Past; Vulcan 1500, V Star 650, KLX 250(dirt bike) TT250(dirt bike)

Offline natehimself

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #10 on: December 05, 2020, 07:34:21 PM »
Yup. I have it back in place at this point (without white and yellow, just green/white and brown) but when I put the key in the pump doesn't run at start up and I cant turn the bike over.
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Offline daveson

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #11 on: December 05, 2020, 07:37:42 PM »
I'd use a test light to check for power at the starter motor.

It would be good to know the full VIN number, probably on the right hand side, under the battery cover.
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  • Victoria, Australia
  • Current; '85 K100RT~100,000km; four other bricks. Past; Vulcan 1500, V Star 650, KLX 250(dirt bike) TT250(dirt bike)

Offline natehimself

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #12 on: December 05, 2020, 07:45:54 PM »
Good idea. I will update tomorrow when I get to working on it again. Appreciate the help.
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Offline Laitch

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Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #13 on: December 05, 2020, 07:46:47 PM »
Quote from: natehimself on December 05, 2020, 07:06:22 PM
. . .  I don't get the fuel pump. I also don't get the starter motor if I try and start it but I am honestly unsure if the starter needs that fuel pump to send a state before . . . 
The side stand needs to be up for the fuel pump to run if the moto still has its side stand switch wired in. Is the kill switch in its center position or off-center? The starter doesn't need current from the pump relay for it to work.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles

Offline natehimself

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  • Posts: 8
Re: Brain farted and cut my fuel pump wiring need some help.
« Reply #14 on: December 05, 2020, 07:50:12 PM »
I have never ran to my garage so quickly. However, It is on the center stand.

Kill switch is in the center position.
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