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shp4man · 01-25-2019, 08:53 PM

So recharge the battery. Hook the voltmeter to + and - on the battery. Should read about 12.3 volts. Now, start up the truck. Run it up to about 1500 RPM. Voltmeter should read about 13.5 volts. Up to 1.5 volts more is OK.
Now, turn the lights on bright and the heater fan at full speed. Run it back up to 1500 RPM. Does the voltmeter read the same or less than the 12.3 or whatever you got with the truck not running?

If yes, there's a problem in the charging system.

01-25-2019, 08:53 PM	#8
shp4man Registered User Join Date: Oct 2016 Location: San Diego, CA Posts: 557	Re: Heck of a time with my truck So recharge the battery. Hook the voltmeter to + and - on the battery. Should read about 12.3 volts. Now, start up the truck. Run it up to about 1500 RPM. Voltmeter should read about 13.5 volts. Up to 1.5 volts more is OK. Now, turn the lights on bright and the heater fan at full speed. Run it back up to 1500 RPM. Does the voltmeter read the same or less than the 12.3 or whatever you got with the truck not running? If yes, there's a problem in the charging system. __________________ Everybody has to believe in something. I believe I'll have another beer.