Dean:
Likely two different issues.
The 15.5 volts means the alternator (a three phase device) is having problems. It will destroy the module in your ignition system if it persists.
When you get a replacement, have the store test it in front of you, even after they try to talk you out of it. The “infant mortality rate” on those Chinese rebuilds is astonishing.
The running on is likely not related, and could be dieseling, something I’ve not had to deal with in a very long time. I would start with checking and adjusting the timing.
Someone else here may have better suggestions.
Dolph Santorine
dolph
134 Falls Road
Wheeling, WV 26003
Phone: 304-219-3100
FAX: 304-232-3075
>
> What's the solution to an alternator putting out 15.5 volts? Replace it?
>
> When the motor is normal temp, it bleeds into ignition somehow and the
> engine continues to run 3 to 4 seconds after turning off the key. That
> doesn't happen when cold.
>
> Dean Hanson Fremont ca
>
> 403 engine
>
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