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Electronic starter issue gs550

  • Thread starter Thread starter isu2014
  • Start date Start date
I

isu2014

Guest
On my 78 gs550, when I hit the starter button it blows the ignition fuse. Doesn't engage the starter at all. When the button is pushed the lights dim way down until the fuse blows in about a second, then they come back fine.

It kick starts and runs like a champ, thank God for kick start.

How do I test this? The switch is good and the wire connection in the headlight bucket has power.

I fixed an ignition problem on my buddy's bike where the ground from the starter switch was bad and it wouldn't blow a fuse, just no power. I'm sure I have good power to the fuse, but why is it providing more than the fuse can handle?
 
Open up your right handle switch and look for any bare wires. Then start going through the harness from there back and make sure something isn't touching that shouldn't.
 
I know the switch is fine because I bypassed it and the fuse still blew. I didn't want to cut open the whole wiring loom if it's something simple under the side panels. I've checked for bad wires everywhere I can.
 
isu2014 said:
I know the switch is fine because I bypassed it and the fuse still blew. I didn't want to cut open the whole wiring loom if it's something simple under the side panels. I've checked for bad wires everywhere I can.
Click to expand...
Yes, you can ASSUME that your switch is fine, but only because it only blows the fuse when you push the button.

HOWEVER, there are two wires connected to that switch. The one that is not 'live' until the button is pushed just MIGHT have some insulation pulled back and is shorting out when you push the button.

If you really don't want to go through all the trouble to remove the two screws that hold the switch housing together, feel free to open the seat and remove the tank so you can inspect the rest of the wires that are downstream of the starter switch.

By the way, "downstream of the starter switch", you will find wiring that goes through the headlight bucket to the clutch "safety" switch, back through the headlight bucket, through a connector or three, then on, through the harness to the starter solenoid. There is also a remote possibility that the solenoid itself is shorted.

Happy hunting.

.
 
I already took the switch apart. I know it's fine. The switch is fine. I also had the seat and tank off at the same time. It's not a big deal. I tied my clutch sensor wires together and I thought that might be the issue but they've been tied together for 2 weeks and this just started.
 
tom203 said:
I'm convinced! now unplug the solenoid trigger wire at solenoid and press starter button; what happens now?
Click to expand...

Probably a good test. Since it sounds like there is somehow a short in the solenoid.
 
I unplugged the solenoid trigger wire and the fuse still blew.
 
isu2014 said:
I unplugged the solenoid trigger wire and the fuse still blew.
Click to expand...
Well, that was my best guess! now unplug that trigger wire and use a jumper wire from battery positive to trigger solenoid directly - use small guage wire like 18 g. Does starter engage? Please make sure you are in neutral!!
 
I did it directly and there's power to it because it arcs when the wire touches, but the starter doesn't engage. The fuse didn't blow. I'm guessing bad solenoid.
 
isu2014 said:
I did it directly and there's power to it because it arcs when the wire touches, but the starter doesn't engage. The fuse didn't blow. I'm guessing bad solenoid.
Click to expand...

Did you try the screwdriver across the main terminals to get the starter to spin?

That would confirm it is the solenoid is bad.
 
posplayr said:
Did you try the screwdriver across the main terminals to get the starter to spin?

That would confirm it is the solenoid is bad.
Click to expand...

I used my pocket knife. :D The starter started. Ordered a starter solenoid.
 
Put on the new starter solenoid (got shocked only once) and the bike fired right up electronically.
 
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