Need help on 94 ranger either short or bad alternator or something else

[dean94]

Meter was on dc volts I'm using a cen tech voltmeter had it on 20 volt dc and it showed a 1 so moved it up to 200 volt dc and got the 42 volt dc could my computer be fried causing issues

 

[pentode]

Meter was on dc volts I'm using a cen tech voltmeter had it on 20 volt dc and it showed a 1 so moved it up to 200 volt dc and got the 42 volt dc could my computer be fried causing issues

It won’t be the computer, no.

I have a couple basic questions just to make sure I’m understanding this clearly. Have you tested the voltage across the battery with the truck running? I’m just wondering where you’re taking this measurement where you’re getting 42V.

I doubt it’s related but have you checked the fusible link C?

Am I not seeing something right or can we not fairly confidently condemn the regulator, and therefore the alternator? Someone sanity check me here.

EDIT: just thinking about this the last few minutes, if there's really 42V on the 12v rail in that truck, the computer, radio and a few other bits might be hanging on by a thread, but I would think everything that's not internally regulated, such as all the light bulbs, would (*should) be blown to bits by now.

 

[dean94]

Truck won't run with alternator hooked up but will run with it unhooked so I tested wire that runs from stud on back of alternator that runs to fender well solenoid unhooked from solenoid side. Is fuseable link c on the wire that runs on alternator wire that runs from stud to fender well solenoid. Alternator been checked twice good both times according to oriellys