Ok so my dumb brother went to put a different battery in my truck and hooked it up backwards. now my truck is completely dead no power anywhere. I cant figure out whats wrong. I NEED HELP any advice would be great and pics would be helpful tooo

 

Check the fusible links. The small wires that connect to the battery side of the starter solenoid, at least one of them should have a tab on it that says "fusible link" then (probably) 16 GA. Take this wire and tug on it. If it feels soft or stretches, the link is burned out and needs to be replaced. They're available at the parts store. DON'T REPLACE THEM WITH REGULAR WIRE!.
Also, expect more damage, possibly the alternator (the diode bridge doesn't like reverse polarity) and voltage regulator, if it's the solid state version. Also, if you have a later model radio, that could be toast too.

 

Advice: Don't let your brother apply a wrench or screwdriver to your truck. Don't let him operate anything electrical either.

In fact, he should be relegated to riding in the bed if that is allowed in your state. I'd give him a six-month sentence.

 

Dam....

Definitely start with the fusible links, working your way into the fuse box..

Then regulate your brother to riding in the bed and as he gets better maybe the passenger seat


Hio beat me to it!!^^

 

Uhm, I did this... once... dumb guy me used black wire for both leads to the battery, and I didn't double check.

Destroyed my Alternator Voltage Regulator, although it was a 3G Alternator. Stereo seems to have had some proper protection and survived, as did the rest of my junk. Although, I'm not sure what would happen to the Gauge Cluster and it's Voltage Regulator (Upgraded to '90's gauge set which do not use it).

I would guess the Ignition Box would have taken a hit, and any related stuff, like the pickups in the distributor.

Start with the Fusable Links and Fuses first, then work you way through the Ignition, and then the rest.

 

The fusible link between my alt and the battery burnt up on mine when I had that alt power wire grounded to the block.
Instead of the soft pull, you might want to check continuity with a meter from one side of the link to the other.

X3 on the bed of the truck idea.