Yesterday I started the truck in the morning and the check engine light came on right away. It also didn't charge, the gauge showed 10 volt.
I checked the battery when running and it is 12v.
Since we bought the truck back in 2009 it always did the next thing:
When you cold start the truck the volt gauge shows around 10v, than after 2-3 seconds it starts charging, than stops charging again after 2-3 seconds. This goes on for about 2 minutes and than it keep the volts at 3/4 on the gauge.
When warmed up it always keeps the gauge at 3/4.
After reading a bit I think the control unit is bad so I think I will convert it to a old style regulator.
How do I get the check engine light out?