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Louie, Technician
Category: Motorcycle
Satisfied Customers: 12676
Experience:  25+ yrs. experience
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2008 brute force 750 has no spark. I'm getting a constant 12

Customer Question

2008 brute force 750 has no spark. I'm getting a constant 12 volts to the coil. They are not grounding
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Louie replied 1 year ago.

Hi Kris, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.

Initially, let's do a review of the basics and run tests/tries to serve as a process of elimination. Proposed preliminary approaches (if have not been done):

  • • test / bypass / replace the vehicle-down sensor;
  • • check drive belt and/or its failure detection sensor;
  • • then test for IGN+12V on the ECU's blue/black wire;
  • • verify ECU's black/yellow wires are tied to good ground;
  • • ensure sensor feed voltage from ECU's brown/black wire to the various sensors.
Customer: replied 1 year ago.
I tested the source voltage for the vehicle down sensor. That was 5 volts. Is there a way to bypass it so I can be sure? The belt sensor would put a light on the cluster I believe. I did not check it. I will check the rest of the things tomorrow. Do you know where on the machine the ecu's ground are located?
Expert:  Louie replied 1 year ago.

Appreciate the post back on:

  • sensor voltage = 5V, as expected;
  • belt sensor OFF = IGN+12V on the ECU's blue/black wire;
  • ecu's ground = harness' black/yellow wires tied to frame ground;
  • vehicle down sensor check = yellow/green wire normal = 3.7 ~ 4.4V .