DIY Race Harness Questions - Triumph675.Net Forums
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post #1 of 22 Old 05-07-20, 18:19 Thread Starter
Cayden2
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DIY Race Harness Questions

Sure has been a long time since I posted here. With quarantine and all, and lack of forseeable track season, I decided to dig in to a custom race harness for the bike. The bike will not be seeing street riding at all, and I have been hacking away at a spare harness I bought a while back. All I need is the bare minimum to get the bike running for the track. I have several questions and I'm hoping someone on here will be able to help me out. I run attack triples, so the key/cylinder are loose and just zip tied to the fair stay, so getting rid of that would be a priority. I have also had terrible luck with the stock run switch and ignition switch (cost me at least 3 track days), so getting rid of those would be huge. The way the bike starts now is I turn the key to run position and then hit the ignition switch (the run toggle switch was removed after there was internal break found in the wire, so I just soldered them together).

I plan on keeping the "alarm" plug and having it accessible at the front of the bike (I have just the 4 wires that are jumpered together with how it comes). When I want to turn off the bike I'll just pull that plug to kill the bike.

Questions:

Are the fuses even necessary at this point? The bike will be running again at a bare minimum, so what is the point of the fuses? Can they be spliced out of the equation (though I would imagine keeping the fuse for the ECM might be smart?).

Can any of the relays be spliced out too? The only relays I have presently are the starter relay, ECM relay, and a mystery relay which I can't find on the wiring diagram (I think it is the fuel pump relay though).

List of connectors on the harness still:

oil pressure
throttle position
quickshifter
alarm 4 wire/kill plug
diagnostic connector for Tune ECU
MAP
Gear position
coils 1,2,3
injector 1,2,3
Fuel pump
Low fuel (needed?)
Speed sensor
crankshaft
idle speed control (needed? I have race kit manual idle adjustor)
Dash
Coolant temp
Tip over sensor (would like to keep incase of fall)
Ambient pressure (needed?, one near the intake flapper valve which isn't there)
Intake air temp
Kickstand (would like to remove but not sure how)
Clutch (need to keep for 09 bike?)
EMS main relay
Starter relay
Mystery relay (fuel pump maybe?)
Starter button/engine start stop
ECM plugs

The bike is already set up for the track with SAI remove, intake flapper, O2, and pretty much anything else that's considered not necessary for track. I have no problem cutting wires and soldering them back together. Ideally, if I could have it so the bike is "on" unless the alarm plug is removed, and cranking the bike by using an aftermarket run switch, that would be the perfect set up I think. The attached pictures are of how the harness currently is, how the alarm plug is set up, and then of the mystery relay. Thanks in advanced and sorry for the wall of text!
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post #2 of 22 Old 05-08-20, 01:27
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You definitely want the tip-over sensor. A carbed bike will dump the fuel in the bowls and stall quickly, but an EFI bike with a reasonably full tank will keep running until the crank bearings seize.


If you're running track days and race days, you will absolutely need a working kill switch. If your right-hand switch cluster is beyond easy repair, replacements are cheap enough on eBay.


The sidestand switch is simply a matter of jumping / connecting the two wires together.


Zip-tie the alarm connector together. If it's easy enough to separate to use as a kill switch, it's easy enough to vibrate loose while running.


Edit to add: The fuses are MORE important on a race bike, since there is more available electrical power to do rude things to your wiring. The headlights and other lights are major loads consuming a large portion of the stator's output; this excess power is shunted to ground through the voltage regulator, which will run hotter than on a street bike.

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post #3 of 22 Old 05-08-20, 02:09
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I am working on the same project right now so I would love to piggy back on this thread. TTRIgnitionSystems, regarding the alarm system I have a similar question. The picture below is my currently situation, I have a working woodcraft ignition eliminator and kill switch. Is there anyway to cross the correct wires so I can cut these down to the ECU?


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post #4 of 22 Old 05-08-20, 02:16
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Not without a lot more wiring info and probably a fair bit of trial and error. The ignition / kill switch doesn't connect directly to the ECU, while I'm willing to bet that the alarm connector does. It's entirely possible that the wires for the alarm and the eliminator don't map together at all.

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post #5 of 22 Old 05-08-20, 03:53
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Quote:
Originally Posted by TTRIgnitionSystems View Post
Not without a lot more wiring info and probably a fair bit of trial and error. The ignition / kill switch doesn't connect directly to the ECU, while I'm willing to bet that the alarm connector does. It's entirely possible that the wires for the alarm and the eliminator don't map together at all.
Makes senes, I'll just leave this guy alone then. I'm trying to make it easier on myself not harder :)

Thanks for the help!

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post #6 of 22 Old 05-08-20, 09:58 Thread Starter
Cayden2
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You can pull all of those ground wires out of that connector except for the ones that are junctioned together. The rest of those ground wires are basically dead wires.

TTRI: Good call on the fuses being more important because technically increased load. I forgot about that. I kind of figured the kickstand switch was as simple as connecting to two wires together. That definitely solves that part of the equation!

I've checked pretty much every single post regarding race harnesses in the eletrical section and I'm almost 100 percent sure that the idle speed control plug can be removed if you have the manual idle adjuster.
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post #7 of 22 Old 05-12-20, 21:06
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Make sure you snip the right wire! Ha ha. Looks like a big job. PM replied to. Best of luck.
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post #8 of 22 Old 05-29-20, 11:16 Thread Starter
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So the race harness is coming along pretty well. Almost done. 1 question if anyone knows or not.

Is there any need to actually have the relays in there any more, or can wire them to be in the *on* position at all times. Only relays left are fuel pump, ECM, and starter relay. I am keeping the fuse box for obvious reasons, but if the relays can be switched to always on and the wires soldered together, then why not.
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post #9 of 22 Old 05-29-20, 15:20
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I would leave the relays. There's a lot more going on in the typical FP relay than just moving contacts.

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post #10 of 22 Old 05-29-20, 15:24
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The factory race harness only has 2 relays. One is definitely for the fan but I don't even have a fan anymore. The other one...starter maybe? I can check when I'm at the track on Monday.
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