I hooked up some jumper cables backward for a second.

go ahead take ALT off run it over 2 ALTERNATOR shop auto will do dio burnt up should be less than $90 bills

 

before you do that I would let the truck run a minute first then just kinda pet the throttle a time or two get it above 1500 I almost bet it will start charging. If so and possible get a charger and charge the batteries back up the hardest thing on an alternator is bringing batteries back up they were designed to maintain. Since the pete was plum dead I about bet no damage was done.

 

Connecting a dead battery with jumper cables backwards can destroy the regulator in the alternator or short an alternator diode. Also, check all of your fuses.

As a side note, I've seen a dead battery reverse polarity when it was charged backwards. But that one wasn't connected to anything but the charger.

 

I belive the fuse panel on that truck is on the drivers side, left side of foot well wall. there should be 1 screw you remove to get the cover off

 

Just let the thing charge for awhile before you do any of the above.

 

and the fuses for the charging. if it has any. would be in the battery box. wouldn't it?

dead batteries take a long time to charge. if you got 4 batteries, each one holding 1000 amps. that's 4000 amps.

i've drained 4 batteries before. took almost a full day of driving to get fully charged.

some alternators get worn out and don't even kick in till they're reved up. as was posted above.

 

it really just sounds like your batteries are dead, 30 days of sitting. . there going to need a good charge.

 

Alternators are probably the easiest item to change, especially in a single belt, tensioner type setup. It's just a little but harder if its a swivel style, but still easy if you end up buying an alternator, make sure you get a new pulley as well. Getting the old one off the alternator can be a real pain.