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Good day all, I'm having some electrical troubles with a 2000 model VT750 ACE. I have access to the factory service manual and have been going through the battery charging / troubleshooting flow chart to try and diagnose the problem. I have also been doing some reading through this forum to familiarize myself with how the electrical system is made up. This is my 1st motorcycle, so I am in the learning process right now. I'd like your opinions where applicable on the matter.
1) At idle, voltage rests at 11.xV - 12.xV and struggles to climb higher the more I rev the motor. When the battery runs flat, the bike cuts off.
2) I somehow blew the head light fuse while connecting a charger to the battery, while it was still connected to the bike. I left the headlight off and redid the voltage tests. I then got way over 15V when I idle up the motor! I automatically assumed the regulator / rectifier is bad at this point.
Bad Regulator - YouTube
3) Continuing through the manual, I decided to check the stator to make sure that is OK. At the 5 pin connector to the R/R, I wasn't getting any resistance between two of the 3 coils from the stator (measuring between the 3 yellow wires). 5 pin R/R connector seen at bottom of pic.
4) Page 16-9 in the manual makes mention of a charging line (3P connector). I finally figured out where that connector was and saw the terminals badly corroded. I measured the resistance between the 3 yellow wires on that 3P connector and got less than 0.5Ω each. If I followed the lines correctly, I figure that means the stator coils are in OK condition.
At this point I am assuming the faulty wiring caused the regulator to fail, hence the high voltage seen.. I am still open to the possibility that the regulator could still be OK, and the faulty wiring is what caused the high voltage..
What are your thoughts on the matter?
___________________________________________________________
2nd problem I am getting is the horn isn't working. I am getting approx 11V at the horn connector (with the battery charged). I know the horn itself is functional as it sounds when I connect it to a 12V supply. When I place my DMMeter leads across the horn terminals and press the button, it doesn't register any voltage with the horn connected..
Is there a horn relay anywhere on this bike?
___________________________________________________________
I came across the electrical upgrade thread in this forum and did some reading on the MOSFET type regulators. I would like to upgrade to the SH775 regulator one time..
roadstercycle.com
1) At idle, voltage rests at 11.xV - 12.xV and struggles to climb higher the more I rev the motor. When the battery runs flat, the bike cuts off.
2) I somehow blew the head light fuse while connecting a charger to the battery, while it was still connected to the bike. I left the headlight off and redid the voltage tests. I then got way over 15V when I idle up the motor! I automatically assumed the regulator / rectifier is bad at this point.
Bad Regulator - YouTube
3) Continuing through the manual, I decided to check the stator to make sure that is OK. At the 5 pin connector to the R/R, I wasn't getting any resistance between two of the 3 coils from the stator (measuring between the 3 yellow wires). 5 pin R/R connector seen at bottom of pic.

4) Page 16-9 in the manual makes mention of a charging line (3P connector). I finally figured out where that connector was and saw the terminals badly corroded. I measured the resistance between the 3 yellow wires on that 3P connector and got less than 0.5Ω each. If I followed the lines correctly, I figure that means the stator coils are in OK condition.


At this point I am assuming the faulty wiring caused the regulator to fail, hence the high voltage seen.. I am still open to the possibility that the regulator could still be OK, and the faulty wiring is what caused the high voltage..
What are your thoughts on the matter?
___________________________________________________________
2nd problem I am getting is the horn isn't working. I am getting approx 11V at the horn connector (with the battery charged). I know the horn itself is functional as it sounds when I connect it to a 12V supply. When I place my DMMeter leads across the horn terminals and press the button, it doesn't register any voltage with the horn connected..
Is there a horn relay anywhere on this bike?
___________________________________________________________
I came across the electrical upgrade thread in this forum and did some reading on the MOSFET type regulators. I would like to upgrade to the SH775 regulator one time..
roadstercycle.com