ST1100 - Strange Issue

Uncle Phil

Uncle Phil

Site Supporter
Joined
Feb 26, 2007
Messages
11,150
Age
72
Location
In The Holler West Of Nashville, Tennessee
Bike
4 ST1100(s)
2025 Miles
004365
When the bike is in gear and I pull in the clutch lever, the neutral light comes on.
1. Brand new clutch switch (replaced it and it did not fix it).
2. Swapped the wires on the terminal (did not fix it).
3. Battery cables are tight and clean.
4. If I pull both wires off the switch, it works as it should.

Ideas?
 
Uncle Phil said:
When the bike is in gear and I pull in the clutch lever, the neutral light comes on.
1. Brand new clutch switch (replaced it and it did not fix it).
2. Swapped the wires on the terminal (did not fix it).
3. Battery cables are tight and clean.
4. If I pull both wires off the switch, it works as it should.

Ideas?
Click to expand...
Your clutch diode is toast. It’s located In the harness on the left side of the air box. All wrapped up in tape
They’re expensive but you can make one with two diodes instructions are in the Archives-of wisdom on the other site

Clutch Diode Information ( ST1100 ) *

Clutch Diode Information ( ST1100 ) *
www.st-riders.net
 
Last edited:
That diode got shorted out. Check the red connector at the main relay. The two thin wires green and yellow I think could have shorted out in the connector
 
That is definitely the symptoms displayed by a blown clutch diode. Good news is that it doesn't stop the bike from functioning. Check out the behaviour of the side stand though - just on the offchance that the signal received by the ECU now allows you to set off with the side stand down.

But you need to check out the short - or the polarity of the terminals (if you have had the terminals out of the connector). If you don't find out what blew the diode in the first place, it will happen again as soon as you plug in a new one.
 
jfheath said:
But you need to check out the short - or the polarity of the terminals (if you have had the terminals out of the connector). If you don't find out what blew the diode in the first place, it will happen again as soon as you plug in a new one.
Click to expand...
More than likely when I had to pull the gas tank on the side of the road to fix a broken throttle cable.
I touched the back hot post on the MotoBatt battery as I slide in the tank back into place.

Uncle Phil - West 2020 Day 07

www.unclephil.us
 
Uncle Phil said:
Correct diagnosis - I replaced the clutch diode (Big Thank You Mr. Cheese) and now all is happy in Neutral Light Land. :biggrin:
Thanks for the help as always.
Click to expand...
I can't believe that with all the miles and all the 1100's you have that you found a problem that stumped you! Glad you got it straightened out.
 
st11ray said:
I can't believe that with all the miles and all the 1100's you have that you found a problem that stumped you! Glad you got it straightened out.
Click to expand...
It didn't 'stump' me as much as I knew someone would have the answer faster than I could research or investigate it. :biggrin:
 
To be fair, it takes but a few seconds to diagnose the clutch diode problem - when you have experienced it once. It takes at least 24 hours to find where Honda have hidden it and to reassemble the fuses in the correct locations after failing to find it in the most logical place.
 
jfheath said:
To be fair, it takes but a few seconds to diagnose the clutch diode problem - when you have experienced it once. It takes at least 24 hours to find where Honda have hidden it and to reassemble the fuses in the correct locations after failing to find it in the most logical place.
Click to expand...
Yep, and they put enough tape around it that it takes a bit to dig it out! :biggrin:
 
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