Question about 1987 Suzuki GSX 750 ES
First you must check your generator output.
Disconnect the three yellow wires comming from your generator from their connector
connect a multimeter in AC mode between a pair of yellow cables (anything you like)
Start your engine and keep running at 5000RPM.
Check the reading on your ac meter you must have above 80volts
Repeat the test with the other pairs of cable
IF any test are below 80volt replace the coil.
In my case I have put coils from a Kawasaki gpz550 .
It fits exactly and I forgot any problem.
Hope help you
Posted on Mar 28, 2009
Those voltage numbers are horrible. Just sitting on your workbench, the battery should read at least 12.8 volts. And without the gear turned on, the voltage at idle should be above 14 volts. I have a hunch you're going to find the voltage regulator and/or bad connections in the brown coupler are the culprit, but I suppose it wouldn't hurt to check the alternator. Unplug the brown coupler, set your meter to read AC volts and probe any two of the yellow wires in the harness side of the coupler. Rev the engine to 4000 rpm and you should see at least 60 volts AC. If you consider the three yellow wires to be A, B, and C, you'll need to perform this test on the pairs A-B, A-C, and B-C. Good luck.
Posted on Nov 10, 2008
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