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Old 08-21-2008, 10:52 AM   #1
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How hard is it to replace a wiring harness?

Ok so I think I may have an issue with my wiring and am considering installing a new wiring harness but am unsure whether this is something that I should try doing myself or take to a certified tech. I'm one of those types that in efforts to learn something new, will look to do it myself first. So tell me...how hard would something like this be?

Thanks in advance for any advice provided!
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Old 08-21-2008, 12:02 PM   #2
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not so much a technical issue; know how to remove plastics if needed and snake it out carfully. Make sure everything plugs up where it needs to.

Especially: make sure the new harness has the correct plugs and all of them for that model. If not, ur looking to have headaches.
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Old 08-21-2008, 12:02 PM   #3
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what he said
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Old 08-21-2008, 12:05 PM   #4
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Quote:
Originally Posted by CaligoneTx View Post
not so much a technical issue; know how to remove plastics if needed and snake it out carfully. Make sure everything plugs up where it needs to.

Especially: make sure the new harness has the correct plugs and all of them for that model. If not, ur looking to have headaches.
Yeah, all the plastics are off so I just need to be sure to get the exact right harness. Thanks
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Old 08-21-2008, 12:06 PM   #5
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line the new harness up with the old one, unplug the old harness plug and plug in the new one, one plug at a time and route it the same way, i've replaced my wiring harness 3 times on my f4i so i dont need to do this anymore, but it helped the first time.
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Old 08-21-2008, 12:13 PM   #6
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Quote:
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line the new harness up with the old one, unplug the old harness plug and plug in the new one, one plug at a time and route it the same way, i've replaced my wiring harness 3 times on my f4i so i dont need to do this anymore, but it helped the first time.
Preciate it...

...Curious: What symptoms caused you to get a new harness? Was the bike shorting out or did you just figure you needed one based on the amount of time that had passed?
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Old 08-21-2008, 12:18 PM   #7
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Quote:
Originally Posted by CaJuNsOuLjA View Post
Preciate it...

...Curious: What symptoms caused you to get a new harness? Was the bike shorting out or did you just figure you needed one based on the amount of time that had passed?
well first it shorted out my ecu, so i got a used one from clayton, it worked for a while and then shorted out again,(or so i thought) i bought a new harness off ebay and replaced it...i replaced everything except my ignition(cause turning the key on turned on my bike but not my fuel pump) but after some peeps on here posting up some usefull info i found out it was my ignition

but the reason for all that is that my ecu went out...now i have a new ignition, new ecu, new harness...now thats left to blow and go is my rectifier
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Old 08-21-2008, 12:18 PM   #8
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Most of the factory service manuals also show detailed routing maps for the harness.Comes in handy
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Old 08-21-2008, 12:20 PM   #9
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Quote:
Originally Posted by f4iguy View Post
well first it shorted out my ecu, so i got a used one from clayton, it worked for a while and then shorted out again,(or so i thought) i bought a new harness off ebay and replaced it...i replaced everything except my ignition(cause turning the key on turned on my bike but not my fuel pump) but after some peeps on here posting up some usefull info i found out it was my ignition

but the reason for all that is that my ecu went out...now i have a new ignition, new ecu, new harness...now thats left to blow and go is my rectifier
Sounds like that was a fun few weeks for ya Thanks for the info

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Most of the factory service manuals also show detailed routing maps for the harness.Comes in handy
Yep, probably getting one of those today
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Old 08-21-2008, 12:29 PM   #10
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Quote:
Originally Posted by CaJuNsOuLjA View Post
Sounds like that was a fun few weeks for ya Thanks for the info



Yep, probably getting one of those today


almost two months, plus i was working 7-14's at the time too..but with help from friends and peeps on this board i got it figured out and for cheap too
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Old 08-21-2008, 12:32 PM   #11
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Quote:
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almost two months, plus i was working 7-14's at the time too..but with help from friends and peeps on this board i got it figured out and for cheap too
, that had to suck...ain't rode in liek a month (hadn't rode hard in like 3) and it sucks BAWLS...definitely ready to get back on the rode...
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Old 08-21-2008, 12:38 PM   #12
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im still not on the road, got my frame at scootertrashes, and working on fixing little things on my stunt piece, so this time when i ride around town i'll feel better about riding out to asi
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Old 08-21-2008, 12:41 PM   #13
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im still not on the road, got my frame at scootertrashes, and working on fixing little things on my stunt piece, so this time when i ride around town i'll feel better about riding out to asi
Gotcha...I'm hoping this new harness fixes my problem. I'm still considering getting a new bike because I don't trust my bike as much as I used since the day it cut off on me at the apex of a curve...THAT was some crazy shyt
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Old 08-21-2008, 12:47 PM   #14
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Harness replacement is very straightforward most, if not all manufacturers have the harnesses set up so its almost impossible to confuse which plug goes where....pull all the plastics and the tank and pay close attention to the routing, especially around the engine because there are asome very tight spots, but you should be able to replace it all without any major mechanical disassembly
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Old 08-21-2008, 12:47 PM   #15
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I've the same bike, never had a problem.
Let me know if you figure out what went wrong...
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Old 08-21-2008, 12:51 PM   #16
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Quote:
Originally Posted by lisiecki1 View Post
Harness replacement is very straightforward most, if not all manufacturers have the harnesses set up so its almost impossible to confuse which plug goes where....pull all the plastics and the tank and pay close attention to the routing, especially around the engine because there are asome very tight spots, but you should be able to replace it all without any major mechanical disassembly
honda has some plugs that can be plugged into others, but if you just look at the wires you'll see it doesn't go there
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Old 08-21-2008, 12:56 PM   #17
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Quote:
Originally Posted by lisiecki1 View Post
Harness replacement is very straightforward most, if not all manufacturers have the harnesses set up so its almost impossible to confuse which plug goes where....pull all the plastics and the tank and pay close attention to the routing, especially around the engine because there are asome very tight spots, but you should be able to replace it all without any major mechanical disassembly
Thanks. Do you think that (a fried port in the harness) would be the catalyst for my bike shorting like that? Someone said it could either be the harness or a lose ground somewhere...

Quote:
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I've the same bike, never had a problem.
Let me know if you figure out what went wrong...
No prob
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Old 08-21-2008, 01:03 PM   #18
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Without putting my hands on it its hard to tell.....I did a harness recently on an 03 gsxr750 that had corrosion in the headlight connector that made its way through the entire harness, eventually causing the fuel pump and starter button to quit working all in all I would say its highly likely that a fried port was the origination of your problem....but the question is, why did the port fry in the first place?
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Old 08-21-2008, 01:11 PM   #19
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Without putting my hands on it its hard to tell.....I did a harness recently on an 03 gsxr750 that had corrosion in the headlight connector that made its way through the entire harness, eventually causing the fuel pump and starter button to quit working all in all I would say its highly likely that a fried port was the origination of your problem....but the question is, why did the port fry in the first place?
I think it may have come from one of two possible sources. Perhaps when installing my aftermarket tail light, I didn't properly splice one of the wires and there was some kind of connectivity/continuity issue or it could be the same issue as what you recently came across with corrosion (or some other ailment) in the headlights because when I first started having issues, my head lights were the first to go (this was easily addressed my manipulating the harness causing the light to come back on, again, the point of origination [at this point] is in the harness). Then it got progressively worse, leading eventually to the bike shorting out that day on the freeway. Basically, everything shut off (lights, engine, etc) and then immediately came back on, but not before the tire broke and I had staying on rubber Luckily I didn't bust my . This happened twice before I decided to park her until I could isolate where this issue is originating from...
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