39racing

My generac quietpact 75D Diesel does the same thing or sometimes it will run for a minute and quit or 30 minutes or 3 days. So mine doesn't seem to be an overheating problem. Then wait 20 minutes may start and stop in one minute or run for 10 minutes. Has a mind of it own. Have replaced exhaust tube and oil pressure sensor. Now put voltage meter on it and when its running its at 14 and as soon as voltage drops to 12 it shuts down. Any ideas anyone