2015 R3R Main Harness replacement

PappyBlade

PappyBlade

Trucks, it's what's for dinner and everything else
Joined
Jun 18, 2019
Messages
55
Location
Youngstown, OH 44511
Ride
"Mor'du" 2015 Rocket 3 Roadster ABS
A local shop, which I will not name, in the interest of diagnosis, cut the living hell out of my main harness. I took it to a local Triumph dealer, who said I need a new main harness just to diagnose why the bike is dead electronically. We're assuming it's the ECM(ECU, whatever).
Am I taking on too big a project, or is this a simple yet tedious task?
Anyone close enough to actually come HELP would be welcome!!!
 
Ive changed out a harness on a touring, its plug and play. Its two harnesses, i would suggest another shop, this is simple diagnosis of electrical. They should be able to say pin 38 on ecm is not sending power to relay, etc etc, not you need a new wiring harness, as long as there is continuity in each wire being checked then youre good, and every pin at ecu can be checked. @Rocket Scientist just replaced a bad ecu, he diagnosed the problem and changed the correct part, in that case it was the ecu as he found out by diagnosing.
 
PappyBlade said:
A local shop, which I will not name, in the interest of diagnosis, cut the living hell out of my main harness. I took it to a local Triumph dealer, who said I need a new main harness just to diagnose why the bike is dead electronically. We're assuming it's the ECM(ECU, whatever).
Am I taking on too big a project, or is this a simple yet tedious task?
Anyone close enough to actually come HELP would be welcome!!!
Click to expand...

well i had a gentleman in Canada with a rocket that would fail to start some of the time and it had been worked on by a few experts it had the expensive guard dawg installed in it and one of the experts cut all the head relays and wiring out of it so no headlights and still had a rocket that would fail to start.
the so call experts would not even look at it.
any we used google meet on phones so he could put the camera on whatever i needed to see it took a long time but we finally got it fixed . now he knew nothing about nothing when we started so i even had to teach him how to read volts on the meter and to use a 12 volt test light.
i really can not see changing the wiring harness i think that first try to repair.
may bbe a couple of us can help.
 
if the bike is dead electronically that should be a piece of cake to diagnose
take a 12 volt test light turn on the ignition switch and on the tester put clamp on negative and start checking each side of the fuses.
 
Herman is exactly right, alot of checking to do before removing that harness, any problem with harness if one is found trouble shooting can be repaired and move on with troubleshooting.
 
PappyBlade said:
A local shop, which I will not name, in the interest of diagnosis, cut the living hell out of my main harness.
Click to expand...
First, that shop owes you a new harness. Second, regardless of the initiating condition, a repair should never require the harness be cut to fix it.
 
atomsplitter said:
First, that shop owes you a new harness. Second, regardless of the initiating condition, a repair should never require the harness be cut to fix it.
Click to expand...

Correct
That's what probes are for
The only time you cut a single wire is when you know that wire is the problem and you cut it in a way as to be able to repair it if you are wrong.
 
Well, with a Roadster you can indeed find yourself having to open up a main harness to fix a problem - the good ol purple wire that has multiple crimps on it that suffer from dry rot/copper oxide and break. Leaving the bike unstartable with dead clocks due to the CANBUS design.

I too have replaced an entire harness on a Roadster (straightforward but tedious, lot of awkward moments), but for another reason. The purple wire problem is readily repairable.

What was the problem, exactly? (Why it was brought to the shop int he first place)
 
R-III-R Turbo said:
Well, with a Roadster you can indeed find yourself having to open up a main harness to fix a problem - the good ol purple wire that has multiple crimps on it that suffer from dry rot/copper oxide and break. Leaving the bike unstartable with dead clocks due to the CANBUS design.

I too have replaced an entire harness on a Roadster (straightforward but tedious, lot of awkward moments), but for another reason. The purple wire problem is readily repairable.

What was the problem, exactly? (Why it was brought to the shop int he first place)
Click to expand...
I hauled the bike around with me on my semi and it got exposed to road grime and salt WAY more than is healthy. One day it wouldn't start, the next it started fine, the next, no start and no fuel pump whine....
I hauled it to this local shop and they started digging.... cut a few wires to 'test them', then said "we think ECM"....
I hauled it to Triumph in Pgh and they showed me the cuts as well as green prongs on the ECM and ECM harness...They said it needs a new harness before they can be SURE it's the ECM...
My budget's tight, and the bike's value is less than what they quoted for replacing the harness, so I figured I'd try it myself. If nothing else, I'll have the bike apart to sell as parts.
 
The main harness assembly for a Roadster is part # T2501097. The question is whether you want to invest $745.00 in a new harness or take your chances with a salvage yard harness. In either case the shop that cut up your original harness should be on the hook for botching the job in the first place. And based on the symptoms you describe under the conditions the bike was in, it could have been as simple as the negative battery lead to frame needed cleaning.
 

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