Loss of power 2003 1800R 112,000 miles - VTXOA
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post #1 of 11 (permalink) Old 05-17-2017, 12:58 AM Thread Starter
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Loss of power 2003 1800R 112,000 miles

Intermittent loss of power so I preformed these tasks without fixing problem. Each task preformed yielded more power(back to glory days power) but the bike still cut in and out. Big power for a bit to wondering if I was going to make it home power. I re did ground check, checked plugs, removed tank and pulled fuel pump assembly and installed new fuel filter(Napa auto parts $5.29), checked vacuum hoses, trimmed coil wires, checked for broken wires under seat and still problem exists. Had a thought and wiggled wires coming out of the back of the headlamp. Friggin BINGO!! The harness going under tank. Push harness down and sputter. Lift harness up and smooth idle. Yes and crap at them same time. Pulled tank again took a quick look. I can't see it yet but I'm closing in on this SOB like a seal team on Osama Bin Laden.
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Last edited by Charlie_C; 05-17-2017 at 01:00 AM. Reason: Clarification
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post #2 of 11 (permalink) Old 05-17-2017, 07:15 AM
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Take a look at the main harness where the injector cables breakout.
Some problems with wires shorting to the cable clip holding the harness to the frame.
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2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 180,596 miles of smiles
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post #3 of 11 (permalink) Old 05-17-2017, 11:51 AM Thread Starter
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Thanks, was wondering where exactly to start.
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post #4 of 11 (permalink) Old 05-18-2017, 09:58 AM
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Wifes 18R dropped the rear cylinder this winter in Arizona. Like the OP, lots of head scratching. The harness was pulled up tight to the frame with a snap tie and one of the rear coil wires coming out of the harness rubbed through and grounded out.
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post #5 of 11 (permalink) Old 05-18-2017, 11:43 AM
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Valkrider - I see in 2005 you had another issue on the 18R harness.

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 180,596 miles of smiles
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post #6 of 11 (permalink) Old 05-18-2017, 01:07 PM
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Hans & Feet

Yes. Don't remember if it was you or Coyote 4968 that gave me a hand. The issue was intermitent contact in the relays. Another head scratcher. My sister owns that VTX now and still purrs

Warren
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post #7 of 11 (permalink) Old 05-18-2017, 03:05 PM
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Quote:
Originally Posted by Valkrider View Post
Hans & Feet
Yes. Don't remember if it was you or Coyote 4968 that gave me a hand. The issue was intermitent contact in the relays. Another head scratcher. My sister owns that VTX now and still purrs Warren
It was Coyote 4968.
I was a new guy in 2005, knew nothing about the VTX.
A new retiree and riding my new toy was all I wanted.

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 180,596 miles of smiles
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post #8 of 11 (permalink) Old 05-18-2017, 05:20 PM Thread Starter
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So I pulled the tank and started following wires. Unwrapped a portion of the harness and found nothing. I did have a kinda loose wire that goes to front coil. Pinched the fitting and pushed it back on.
Pulled headlamp bucket off of bike (total clusterfk inside of bucket) and found several wires where I could see copper. Fixed that.
Tonight I'll put tank on and see how we did. Will keep you posted.
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post #9 of 11 (permalink) Old 05-19-2017, 12:37 PM
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Do you have a fuel manager? That should have been the first question..
Vampire clips break wire strands.

The "common electronics ground" eyelet has 4 wires on it.
Green/Black is the VSS and speedo/odomdeter ground
Green/Pink are two wires directly to the ECM.
A larger Green wire goes to a 14 pin Yellow connector block that is the Ground Buss for all the other
Green wires to the lights, fan motor, one ECM wire and all the lights.
Wrapped in tape a few inches from the ECM.
One 04 1800 owner fixed his problem by grounding several of the green wires at other places..
Check carefully. Harness clips to frame have caused a few issues. One picture I remember looks like one of
the wires was hooked over a tab on the frame...
2004 vtx 1800 looses power, cuts out, stalls

2005 1300c Red, Mustang seat, HK 2.5 straights. Leds for safety-front & back. 180,596 miles of smiles

Last edited by Hans&Feet; 05-19-2017 at 12:54 PM.
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post #10 of 11 (permalink) Old 05-19-2017, 06:38 PM Thread Starter
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Addressed the copper issue. Not like I'd have liked to but the best I could with electrical tape. I see a solder gun in my future. Tank back on and fired it up, sounded good. Moved the harness around a bit but I secured it so it won't move very much at all. Went for a little ride. Turns, bumps, throttled it. The loose coil plug and the raw copper where the things I believe caused my trouble. I have a minimal amount of money and a lot of time into getting it back on the road but really when it's said and done I've enjoyed fixing it without taking it to the shop and dumping a bunch of money into it. Riding all weekend so fingers are crossed. Good day guys.
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