The two wires in question may or may not be hot, depending on your system. To check your alternator output, do the following.
With the truck at a warm idle, all accessories "off", meter on the 20 or 50 volt DC scale, test accross both posts of the battery. You should get a reading of 12.5 to 14.5 volts. Anything below this, your alternator is bad.
Then, one at a time, with meter still connected, turn your accessories on ie; blower fan, headlights, AC. The meter should not drop below 12.5 volts. Hope this helps.
Tuesday, June 30th, 2020 AT 2:04 PM