2004 ES330 reversed polarity during jumpstart

Just pull harder. It is probably lightly welded from when it blew. Spray with WD40 an hour before.

That sort of thing can badly damage management system, relays, melts connection, fuses. There is a fuse for the computer, check your manual. But get it diagnosed.

Try resetting the CPU program as it may be corrupted from reverse polarity. Have the ECM checked out as reversed polarity tends to damage them internally.

depends on type fuse
mini
maxi
some also have screws that hold them down
locate fuse box under hood
remove cover
look for blown fuse, if NOT screwed in just pull straight up to remove, reverse to install new one
if screwed in just remove screws (righty tighty / lefty losy) reverse to install new fuse

that burned up your alt.and possibly blew main fuse

Did he connect the cables wrong? I would have the alternator tested. I've seen bad alternators blow there fuses. If the cables were hooked up backwards, it may have damaged the alternator.

dont scream but i think you might have blown the ecu to shreads, sorry!

start checking fuses hopefully its just another blown fuse if your lucky

but if all the fuses are good, you probably fried something like the computer or ignition module and probably the radio

hopefully its something simple and cheep but don't be surprised if you have to shell out some cash to replace the computer

its very possable the ecu is damaged, but you will need to check all the fuses and or fuseable links