Why would it put out more than 30 amps when the fuse is suppose to be 20?

 

Shorted circuit?

Vague post == vague response! Details man!

 

i thought there was an automatic transmission problem, so i changed the transmission oil and added stop slip because it was slipping a bit.
when i checked the fuses, i noticed the ign/gau was bad, put another one in and it popped right away. I tested it and it said it was putting out 36.5 amps. i noticed that the transmission fluid was low so i filled it up and took my blazer to get more fluid and it died in the parking lot, i had to get jumped four time to get home, got the alternator test and replaced.

 

And you are driving?? Year, model, options (trans, drivetrain, etc)??

 

1994 s 10 blazer v6 4.3L auto 2WD

 

Here's everything that is powered by that fuse. You could have a problem with one or more of those components and/or a wiring issue between the fuse and any one or more of those components.