engine and drivetrain Electrical Gremlins

[SBriggs]

My car suddenly started to run roughly, like it was only running on 3 cylinders. This engine was rebuild not so long ago and most if not all of the engine electrical components were replaced. The only thing we did not touch was the wiring loom. My mechanic says that there is only 4 volts flowing through the system. I am sure he will figure it out, but any words of wisdom?

[c.d.iesel]

.....well for starters , you need 9 more volts.

where did yours go?

GOT Volt/Ohm Multi Meter?

alternator?

plug connector/wiring on back of alternator?

battery voltage/test?