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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: ptmooore on May 06, 2019, 11:35:23 AM
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Hello everyone
I have an '85 K100 showing no electric power in any system. No power to dash, lights, starter, anything, no relay clicks, like there's no battery or circuit at all.
One year ago the bike was parked in my garage with fuel issues, but with good electrical power and would turn the starter just fine.
I swapped fuel injectors today and now no electric power in any system. No power to dash, lights, starter, anything, no relay clicks, regardless of key on or off, like there's no battery or circuit at all.
when I removed the fuel tank to inspect the wiring, I found lots of evidence of new mouse/rat nesting..but no chewed wires yet
-fuses are good
-Swapped "OK " battery with brand new battery and tested good with multimeter
-triple checked connections on battery and under tank, everything is tight
-checked dash wiring connection, removed and reconnected (the dash is in rough shape but powered on in the same spot a year ago..)
-checked grounds. Is there supposed to be a ground wire around the rear brake pedal?
-Bypassed ignition (key) switch a long time ago, I twisty tie red and green when i want to start it
-HALL and injectors swapped, unrelated
The headlights and brake lights are all currently disconnected, just as they were when I had good power a year ago
I had to run this $800 K100 hard through the troubleshooting flowchart when I first bought it so I have a decent grasp on the systems. Replaced the fuel pump, fuel/ignition relay, had to unstick the injectors, but I got it on the road.
Unfortunately that flowchart starts with good power/circuit. I have no idea where to start here.
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The headlights and brake lights are all currently disconnected, just as they were when I had good power a year ago
..., but I got it on the road.
Running a M/C without lights on the road? As you mentioned, familiarity with systems, a multi-meter and patience with methodical probing and findings jotted in a spiral notebook may get you started.
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You will just have to work you way through the wiring diagram to figure out how far the power it getting.
Most likely, you have your first clue with the mouse evidence...
I would first make sure the ground wire from the battery to the motor was connected and tight. Easy to overlook.
Same with the computer, makes sure it is connected properly.
No diagram in front of me to know where the power goes from the battery next, but I guessing it is the fuses. Even if not, I would look for power there.
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You will have to work your way logically through the wiring as was pointed out by alabrew. Start at the battery. Check power and ground connections. Locate the red wires in the relay box branching off directly from the battery and test those points for continuous power. When you twist red and green together, the Load shed relay should engage; check that. It's going to take some effort but feedback what you find. That will help others help you.