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  Topic Review (Newest First)
07-06-20 15:36
MissedApex I did similar on my SV650.


I highly recommend buying a spare harness so you can lay it out on the floor. Mark each connector function, and then start marking the wires you want to remove. (and what connector they go to!)


Rather than cutting the harness, de-pin the connector! Then if you need to, you can add the wire back in. If you can't de-pin the connector, then make sure you leave enough of a pigtail that you can solder your connection back in.
07-01-20 03:37
alpine 318is
Quote:
Originally Posted by GoDSaLo View Post
gonna try this asap
Go slow or you'll cut the wrong wire like I did and have to back track 20 steps
06-17-20 00:54
GoDSaLo gonna try this asap
06-01-20 11:59
Cayden2
Quote:
Originally Posted by TTRIgnitionSystems View Post
I stand corrected - looking through the wiring diagram, there's nothing like a Yamaha's multifunction (relays, resistors, and diodes) relay blocks.


Never mind ...

Ah okay, thanks for the clarification!
06-01-20 04:09
TTRIgnitionSystems I stand corrected - looking through the wiring diagram, there's nothing like a Yamaha's multifunction (relays, resistors, and diodes) relay blocks.


Never mind ...
06-01-20 01:54
Cayden2
Quote:
Originally Posted by MGFChapin View Post
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.
That's odd that they would have one for the fan because I dont imagine any race bike having a radiator fan at this point. The 3 I'm looking at right now are EMS, starter, and fuel pump.

Starter relay is blue. Normally 5 wires though mine has 4 because I pulled the blue one that would normally be involved in the lighting circuit. Blue and yellow goes to starter fuse. Red and white goes to starter button. Brown and yellow reports back to ECU. The last red and white going to the starter solenoid.

EMS relay is black. Brown and pink going to the ECU and and ignition coils. Yellow and silver to the ECU. Black ground wire to the the bundle towards the alarm connector. Last brown and pink from fuse #6.

The last is the fuel pump relay I believe (I can't find it in the wire diagram on the service manual). It has a purple and white going to the fuel pump connector. A black and purple going to the grey ECU plug. A green and silver as wheel as a green and red, where I can't see exactly where they go because of the eletrical tape covering it right now. I think one goes to the dash connector and the other part of the starter switch/run switch complex.
06-01-20 01:38
Cayden2
Quote:
Originally Posted by TTRIgnitionSystems View Post
I would leave the relays. There's a lot more going on in the typical FP relay than just moving contacts.
Oh really? That's interesting. I wouldn't have thought that. Any idea what functions it may be tinkering with the whole time? The only relays left are Fuel pump, ECM, and starter. I would imagine they stay "on" the whole time, but all 3 communicate back to the ECU, so modulation in the information relayed to it would have to do something I imagine.
05-29-20 15:24
MGFChapin 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.
05-29-20 15:20
TTRIgnitionSystems I would leave the relays. There's a lot more going on in the typical FP relay than just moving contacts.
05-29-20 11:16
Cayden2 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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