Re: Charging trouble with a 1994 Johnson 115hp
You can use a simple household voltmeter to do some testing. At rest, a charged battery should normally read about 12.4 volts. Once the engine is started, it may go down slightly in voltage, then start to increase as the engine runs. Since your engine has a voltage regulator, you should see close to 13.5 volts once the engine has run for 15-20 minutes or so.