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Have an 09 street glide, every time I turn the run/off switch on it blows the ECM power fuse.. checked switch and have good continuity no short.. checked wires all through wiring harness and cannot find the issue. Any help?
The ECM fuse provides power directly to the ECM and to the System relay’s normally open contact. When the relay is energized the contact closes and ECM fuse power goes to the fuel pump, ignition coil, fuel injectors, purge solenoid and ECM.
The run/off switch energizes the system relay so the problem will be somewhere along the Y/GN wire. I would pull the system relay and fuel pump fuse and hook up an ohm meter to the Y/GN wire at the fuel pump fuse holder and ground. A short will read close to zero ohms. I would watch the meter and disconnect the coil, fuel injectors, ecm and purge solenoid if you have one. If the short clears when you disconnect a connector check the component to see if it is shorted to ground or if the connector or conductor is shorted.
Update
So this bike has had the stage 4 upgrade done to it so I have extra Y/Gn wires coming out of the fuse box in its own sleeve with a V/gy wire coming out of the ECM and they run together and plug into going into each cylinder.. the rear cylinder Y/gn wire had a bare spot rubbed in it but when isolated it still blows the ECM power fuse
Not sure I understand what your saying about extra y/gn. With the stage 4 did they install automatic compression release, acrs in the heads?
Too bad the bare spot you found wasn’t the culprit. I would hook up the ohm meter and disconnect things one at a time. Then with all the connectors off start moving wiring around hoping the short clears and the meter shows open. That way you’ll have a pretty good idea where the problem is.
That must be what it is I’m not sure, there is a y/gn and v/gy coming out if each head with the v/gy wire going to the ECM plug and the y/gn wire going into back of fuse box.
i thought the bare spot was the culprit to but cut it out and re plugged it in and still a dead short, so as I unhooked the coil, and both injectors my ohm reading was still around 0.1-0.2 but when I unplugged the ECM it went to O.L does that mean my ECM is bad or the wiring to the plug? there is no visible problem with the wiring
If you plug the connector back into the ecm do you get a short again? You could try ohming out the pins on the ecm, y/gn to grd, see what you get.
If the ecm looks good the problem would be in the harness.
Yes when I plug the ECM back in it inns out, checking the ECM itself everything stays an O.L and visually inspecting every inch of the y/gn wire cannot find any issue.. could it be as simple that the run/off switch is bad?
If I understand right you have the run/off switch off and turn on ignition and the fuse is good. If you look at the first schematic that means the blue/gray wire from the ecm fuse to the ecm and system relay is good.
The run off switch energizes the system relay and the contact closes making the blue/gray common to the Y/Gn and that is when the fuse blows.
The system relay gets its ground through the ecm on the green/orange wire. With the ecm unplugged if you could install a jumper from the gr/or to ground you could the turn ign on and off/run to run and see what the fuse does.
Short in system
