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Old 01-09-2017, 08:09 PM   #1
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alternator???

93yj 4.0, today I noticed my battery voltmeter reading at about 16.5 volts while driving down the highway, but then when I turned on the heat it will drop down to about 14 volts, I was able to do this several times, I got a new battery about 6 months ago, also last week my radio started acting up, it has to be turned on twice before it actually turns on and sometimes it only plays at half volume to what its set for, and will turn off with every bump I hit, I got over 150000 miles on the engine and I don't know if the alternator has ever been replaced. It sounds like an alternator to me but I'd like to see what other people think before I buy something I don't need
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Old 01-09-2017, 08:13 PM   #2
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Use a good digital multimeter to read the voltage. The voltmeter on the dash is not accurate. Post back and go go from there. You probably know that the battery should be ~12.6V key off engine off, and over 14V engine running.

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Old 01-09-2017, 09:29 PM   #3
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I'm thinking the radio and the ammeter may be unrelated.

For the radio, I suspect the radio ground.
I don't know for sure, but It may be possible the radio ground is affecting your ammeter.
Your alternator output is regulated by your computer. Perhaps the computer and radio share a common ground. Just speculating.

MM offers a good suggestion. Harbor Freight has a analog multimeter for around $6.00 or sometimes free with a qualifying purchase.

Good Luck, L.M.
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Old 01-10-2017, 07:31 AM   #4
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how do I test the alternators output voltage
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Old 01-10-2017, 09:40 AM   #5
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All you have to do is place the leads of the multimeter on the battery posts. Should have the readings I posted above.
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1990 Yamaha TW200.

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