05 WR450 starting problems
Posted June 12, 2011 - 02:01 PM
Posted June 13, 2011 - 03:35 PM
You do have 1 fuse, it is under your seat. 10A. The other spot is a spare fuse holder, don't worry if it is empty.
Your red ignition light will not illuminate if the voltage at the ignition circuit is too low (below 12v maybe?). It also turns off after your bike is started.
Your highest current draw device on the bike is the starter- BY FAR. Your bike will run without much juice in the battery or coming from the charging system, but it won't e-start without a lot of juice stored up. Your next step should be to check the battery voltage (under your seat again), and then check it while the bike is running. Your stator/rotor produce AC current and voltage and your rectifier converts it to DC so the battery can use it. The regulator limits the draw on the charging system to keep the battery properly charged. One of these components I just mentioned is probably not working.
Under 12v not running = dead battery. Charge it up and continue testing.
Under 12.9v running = starter system output too low. Your voltage output should be 12.9-15v depending on RPM and load.
If your voltage while running is low you will have to check your regulator and rectifier. You may also want to check your stator. If you can get a decent ohmmeter, check the resistance between the yellow and white wires after you unplug the two wire connector between your fuel tank and the frame, left (clutch) side of the bike. This will measure the resistance through the coils of your stator (caller the AC magneto in the FSM). Should be approximately .27-.48 ohms. You won't be able to measure it that accurately anyway, just make sure it is not zero or a high number (like 20 or infinity!).
Posted June 14, 2011 - 06:53 AM
I live near portland.