Instrument Panel randomly rebooting

[Patleeman]

Hey guys,

I've been having a weird issue with my bike. When I'm sitting at a light or in traffic the computer will randomly reset. It did it infrequently for the last two months. I thought it was the battery but I purchased a new one in August and I put it on a tender a few times. Didn't seem to do anything. The voltage reads healthy as well (off the bike at least).

Today I was lane splitting with my high beams on, going really slow. I got to the light and was sitting there for a few minutes due to traffic when the computer kept resetting, on and off, on and off. The bike faltered once but didn't die. It's been idling fine and the resetting goes away when I'm moving.

I figured it could be either a bad battery (how do I check if it's bad?), my Reg/Rect, or my stator.

I don't know what order I should start diagnosing, or if that's even the issue. What do you guys think?

[DEcosse]

Check the voltage across the battery with the bike running & report back
You very possibly have stator or R/R failure - see the sticky thread for diagnostics.

[Joe Houle]

Inspect the wiring harness at the headstock where it goes under the clamp. If it was the stator dropping low enough to reset ECU, I think you would stall

[Patleeman]

Hey guys, thanks for the help and sorry I couldn't get back sooner. Finals just ended and I finally have time to check the voltages.

Here they are according to the R/R diagnosis thread:

bike off: 12.4v
lights on, engine off: 11.76
Engine idling: 12.71

According to the thread my battery seems to be undercharged and I'm not getting enough voltage when the bike is running which would explain why the computer has been rebooting. I went to check the fuse and to my surprise it was melted but not tripped. Also there was a bit of scorching in the fusebox. This fuse was changed out once before when I didn't notice any issues. Pictures here:




I'm going to go ahead and change out the R/R to a mosfet type. Edit: I'm going to go with the FH012 and the Triumph adapter harness as per Decosse's recommendation.

Thanks again, I really appreciate the help!

[DEcosse]

Better check out your stator too
There is definitely failure of your generating system - you have 50/50 guess at the R/R being the one, but need to check the stator too - it is quite easy to test.
Simplest one is to just to check for isolation between any of the stator terminals to engine ground - should be infinite resistance (open circuit)

You might also consider NOT going with the OEM link lead in this particular case - since you have had melting at the fuse/holder, it would be better to bypass that and go directly to the battery from the R/R (with an auxuliary fiuse)

[Patleeman]

Thanks Decosse. Your guide is amazing and once I get a chance I'll check the stator.

[flashotter]

My 04 instruments were going loopy on me too, did the charging system test as found in this forum and the stock R/R is barely adequate. These bikes suck a lot of juice, would recommend putting on a tender when she's sitting around if possible.

[DEcosse]

Originally Posted by flashotter

... did the charging system test as found in this forum and the stock R/R is barely adequate. ....

Actually not really true - the stock R/R should be quite adequate - as long as it is still functional, along with the stator.
The main problem with the OEM R/R is not its functionality (or marginality as you suggest) but its susceptibility to failure. However if not failed, will operate just as effectively.
Recommendation for replacing a functioning OEM SCR is purely preventative against failure, not performance.

What were your actual numbers from bike idling? If your voltage was/is low, then you most probably have an actual R/R or stator failure.