Honda 30 4 stroke Alternator Problem

[acguy1999]

I just posted a topic the other day and now it's closed. Don't know what happened. Here's my problem.<br /><br />I've got a Honda 30 HP 4 stroke with an onboard charging system. When I put my meter to the plug, there's no voltage. I have traced the wires back to a fuse. It checked good. I contiued to trace wires to 2 gray wires that go to the coils under the flywheel. With the engine running, there's no volts there either. Only reading 0.56 DCV. I completed a resistance test on the coils and the coils are good. 0 resistance. Can anyone give me some help. Thanks

 

[TOHATSU GURU]

Re: Honda 30 4 stroke Alternator Problem

Alternator coil is zapped. But, before you change it go to www.hondamarine.com and bug them for the exact values. Then re-test with a different meter.

 

[cp]

Re: Honda 30 4 stroke Alternator Problem

The coils under the flywheel put out AC not DC volts. Most multimeters will not accurately read AC when set on the DC scale and vice versa, if they read at all. Also, the 2 gray wires should not read zero resistance since that would indicate the coils are shorted, but if you in fact did actually get zero, that would be your problem.<br /><br />Suggest you remeasure for AC voltage at the coils to determine if they are OK, rather than measuring resistance since the coils have very low resistance of about 0.5 ohm or less. If you confirm the coils are putting out around 20 AC volts, then you can go focus on checking out your rectifier which is the component most likely to have failed. Basically if you get the 20 VAC in to the rectifier on the 2 gray wires, but don't get about 14 VDC out to the plug on the other 2 (green and white/red?) wires, then the rectifier is dead.<br /><br />Good luck.

 

[hondon]

Re: Honda 30 4 stroke Alternator Problem

That charging system is only functional when wired to a battery.