GSXR Wiring Harness Issues?

3799 Views 39 Replies 9 Participants Last post by BillV, Nov 8, 2021

kagsxr

Discussion Starter · Sep 15, 2021

I have a k7 gsxr 600. So one day im riding and my bike randomly cuts off. Apparently my ecu was fried so I got a new one, bike turned over once and worked, but wouldnt turn back on after it was turned off. Now, the bike wont completely turn over and my fuel pump isnt priming. Me and my buddy have used our multimeter and circuit tester everywhere and the bike seems fine. Anybody have any idea of where to go from here? I replaced my battery and rectifier after the wires were fucked (for the r/r). My dash doesnt come on either, seems completely dead but I get the indicator lights, hi and low beam dont work either. Ive done all I can think, I dont want to take it to a shop but im out of options lol.

Could my issue be the entire wiring harness? Is that common? I cant find a single thread where someone has had my issues.

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TheGeek

· #2 · Sep 15, 2021

If you tested everywhere, then that means the harness is perfect, no?

Start over with the meter and start with the ignition switch. Make sure power is getting to it (lights are on so...), then power from it. Then go down stream to those items and make sure they're getting power. Measure your ground from the negative pole to the engine post. When you turn the key on, is the FP relay getting energized?

Lastly, did you do the simple stuff like checking the fuses? A lot of troubleshooting can be done by seeing if the fuses are getting power.

TwistedMister

· #3 · Sep 15, 2021

and battery, again, batteries can appear good on multi meter but not be strong enough to clip starter relay and prime pump, put a jump from a car on it or a battery charger after checking all of above from Geek and it still has no crank...

how many volts and amps did battery show, are terminals clean solid with good contact, ground to engine solid and clean?

Reactions: 1

DBConz

· #4 · Sep 15, 2021

this doesnt sound like a wiring harness issue. they dont randomly go

Reactions: 1

peter079

· #5 · Sep 15, 2021 (Edited)

When you say dash doesn't come on, do you mean there is nothing showing on the LCD?
Or just the backlight?

Does the rpm tacho cycle?

Does the dash come on with the old ecu?
Check for broken pins at the ecu.

Reactions: 1

kagsxr

Discussion Starter · #6 · Sep 16, 2021

nothing is shown on the lcd, rpm doesnt cycle, hi beam and turn signal indicators work. I got a new ecu and i still get nothing. The old ecu gives me the same result, and was apparently fried.

kagsxr

Discussion Starter · #7 · Sep 16, 2021

DBConz said:
this doesnt sound like a wiring harness issue. they dont randomly go

right?? so im confused

kagsxr

Discussion Starter · #8 · Sep 16, 2021

peter079 said:
When you say dash doesn't come on, do you mean there is nothing showing on the LCD?
Or just the backlight?

Does the rpm tacho cycle?

Does the dash come on with the old ecu?
Check for broken pins at the ecu.

nothing is shown on the lcd, rpm doesnt cycle, hi beam and turn signal indicators work. I got a new ecu and i still get nothing. The old ecu gives me the same result, and was apparently fried.

DBConz

· #9 · Sep 16, 2021

kagsxr said:
nothing is shown on the lcd, rpm doesnt cycle, hi beam and turn signal indicators work. I got a new ecu and i still get nothing. The old ecu gives me the same result, and was apparently fried.

Test the ECU on a known working bike if possible.

Sounds like you’re having a ground issue. Checked the fuses?

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peter079

· #10 · Sep 17, 2021

If you do a search of the forum with "dash not working", you get many results. Type this in up at the
top of the page, in the Search Community bar.

Here's one to start you off.
**Solved** Headlight and dash tacho unit not working or...

Reactions: 1

kagsxr

Discussion Starter · #11 · Sep 19, 2021

DBConz said:
Test the ECU on a known working bike if possible.

Sounds like you’re having a ground issue. Checked the fuses?

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would the ground issue also affect the fuel pump? I dont have another bike to test it on but when I got the ecu it was "tested"

DBConz

· #12 · Sep 20, 2021

kagsxr said:
would the ground issue also affect the fuel pump? I dont have another bike to test it on but when I got the ecu it was "tested"

absolutely. the bike goes through a series of checks when turning the ignition, and the fuel pump is one of the last ones. if you check the manual, there is a way to verify that your fuel pump is working by giving it direct power for testing purposes.

Reactions: 1

kagsxr

Discussion Starter · #13 · Sep 21, 2021

according to my multimeter, my pump isnt getting power, so is that a wiring harness issue or something else?

DBConz said:
absolutely. the bike goes through a series of checks when turning the ignition, and the fuel pump is one of the last ones. if you check the manual, there is a way to verify that your fuel pump is working by giving it direct power for testing purposes.

thank you bro, gonna check tmmr and then ill let you know what I find

kagsxr

Discussion Starter · #14 · Sep 21, 2021

DBConz said:
absolutely. the bike goes through a series of checks when turning the ignition, and the fuel pump is one of the last ones. if you check the manual, there is a way to verify that your fuel pump is working by giving it direct power for testing purposes

also idk if this sounds crazy but should I try to use starter fluid?

Beairsto Racing

· #15 · Sep 21, 2021

If the fuel pump isn't working, then it's only going to fire briefly as it burns the starting fluid...
Do you have a service manual?
You've been given sound advice above, but it's dependent on you, following a logical sequence in your troubleshooting.

Reactions: 1

DBConz

· #16 · Sep 21, 2021

kagsxr said:
also idk if this sounds crazy but should I try to use starter fluid?

Big NO

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DBConz

· #17 · Sep 21, 2021

Besides the ECU, what other work was done?

Is there a PowerCommander or Bazzaz installed, because that alligator clip for power source is known to go bad.

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Reactions: 1

DBConz

· #18 · Sep 21, 2021

If the battery and rectifier were replaced, did you check or test your stator? If yes, did you put a gasket on? I just had an issue chasing an issue where there was no stator gasket and it was shorting out the circuit, only giving the starter 7 volts.

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Reactions: 1

kagsxr

Discussion Starter · #19 · Sep 21, 2021

DBConz said:
If the battery and rectifier were replaced, did you check or test your stator? If yes, did you put a gasket on? I just had an issue chasing an issue where there was no stator gasket and it was shorting out the circuit, only giving the starter 7 volts.

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replying to ur other post as well, the ecu and rectifier were replaced, stator seems fine as far as volts are concerned but I will double check. I definitely removed the stator cover to check on the coils and put it back, ik I probably needed to put a new gasket but I wasnt worried about it because I was just checking on it incase a coil was shot. Previous owner put a voodoo exhaust on and I dont think they ever tuned the bike cause the F1 light was on. For all I know, before my bike died the rectifier could've already have a fried wire but idk since I never checked before hand. With the old ecu, the bike doenst try to turn over, with the new one it tries and doesn't succeed but the fuel pump also doesnt activate. It started once before when I put the new ecu in, but never again since then. It also has a new battery and is kept on the trickle charger, if anyone in here ever needs videos just dm or something so I can send yall snapchats of what ive tried and experienced cause tbh I might just be going about stuff wrong.

Hope that clarified some stuff lol

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kagsxr

Discussion Starter · #20 · Sep 21, 2021

Beairsto Racing said:
If the fuel pump isn't working, then it's only going to fire briefly as it burns the starting fluid...
Do you have a service manual?
You've been given sound advice above, but it's dependent on you, following a logical sequence in your troubleshooting.

Yeah im going to try to do some fuel pump trouble shooting tmmr, im pretty sure ive already done what was in the manual but of course it doesnt hurt to double check. As far as checking on wiring and harnesses and plugs n whatever for the tach, everything seems in tiptop shape so I really dont know what to do. Ive watched videos and stuff, checked forums, but the solutions people found arent working for me. Thats why im curious to see if its an entire wiring harnes issue, even tho stuff seems to be squared away (like no burnt fuses, signal and neutral indicators work, turnsignals work but not headlights). If I truly cant find out whats wrong ill take it back to a mechanic for diagnosing again.

Thanks for the reply!!

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