[Luna2]

I did my biggest screw up today I went to hook up a new battery and didn't notice the terminals were opposite of the old one. I hooked up one and as soon as I touched the other terminal it sparked and the horn honked. I straightened it out but now the car won't start. I checked all the fuses and found one blown. Changed it still no good. What should I check now

Did you check the fuses under the dash, then there is the 120 amp fuse under the hood. A real PITA to remove...

 

[Luna2]

Where under the dash-- I will get out the book. This is a gen 6 by the way-- where is the 120 amp, I checked the fuse and relay box didn't see any thing that big unless it is the blue bars in this pic, How do you remove these? A tug with some pliers didn't do anything.

Look under the dash at the coin holder, you will have to lay on your back.
The 120 amp fuse is the 82620-33030 numbered one. The car will start with this fuse open, but you will have weird symptoms on the dash and the battery will not be charge as the alternator isn't connected to the battery.

 

[Luna2]

Upon further inspection with a flashlight at multiple angles the 33030 does have the first junction blown. I changed a 10 amp fuse It was one of the ignition fuses under the dash. It will now start with my remote start but not with the key. I have dome lights and dash lights. No headlights etc, no power seats or ac, and the car won't go into gear. The abs lights are on the tpms light is on and the outside temp says E.

All the parts stores are already closed and wally world doesn't carry the right type of fuse. I hope the parts houses do as they are a mini size but the pins are very short and not the same as the standard mini fuses such as those under the hood. I am hoping I got away with just a bunch of blown fuses but we will see tomorrow.

I also have the wife's Malibu to trouble shoot, when it rains it pours. I found a bad relay in it, it was keeping the parking lights on all the time. It still wont start though. It will turn over and occasionally cough but not go. I think it is the fuel pump, If when it finally cools off and then it starts that will be an indication to me of the fuel pump. It has a clean fuel filter.

This 120 amp fuse is at the top of expanding layers of fusses and relays and more fuses.

As in;
These fuses will not have any power from the battery;
ABS 1 & 2
RR DEF
HTR
RDI FAN
FAN MAIN
Door #2
FR FOG
OBD
AM1
P/SEAT
POWER
S/ROOF
A/C
STOP

High current contacts battery power is absent on these relays also;
ACC
IG1
Tail
POWER

And the list keeps expanding from here.

 

[Luna2]

If your talking about these fuses

they are dealer only. Autozone, advance auto, walmart, etc none of them carried that tiny fuse. Though my dealer didn't charge me for new ones (which is always a plus), you might get lucky.

I couldn't find them locally either, I used a standard mini till I could get the correct ones, just couldn't put the cover back on.

I bought a complete kit (all sizes) on flea-bay, in my trunk now.

 

[Luna2]

Yeah my local dealer confirmed the dealer only, He said he has a bunch of those in stock. I don't know about the price for them. The big bar fuse he will have in by 8am tommorrow $22 and change so that is not as bad as it could be. I will let you know how it goes when I get the parts and swap them out. Any big things to worry about with taking apart the fuse block? It seemed like just the one bolt in the block itself then some plastic snap together action?

Disconnect the negative cable from the battery and leave it loose till you are complete with the fuse change.

 

[Luna2]

Well I have the car back, $263 later, with all the parts I changed and gas running around I spent $400 in less than one second. That is worse than Vegas!

The tech that worked on it had a family matter come up and was gone by the time I made the 66 mile drive to the dealer. I didn't get a chance to quiz him. The ticket says it was a 7.5 amp fuse AM1. I got the impression it was not under the dash or hood where else would this fuse be? I did check every fuse, I didn't put a meter on them but got a very good look none of them were burned and I visually saw a complete wire on every one. It also had codes 500, 2780, b1861, and u0129. Any idea what all of those are?

Any way, I hope I got my real moment of genius done for the next decade!

AM1 fuse is under the dash and provides 12 volts to the following (no voltage = dead)

ACC Relay dead (radio 2, ECU-ACC & Power Outlet will remain dead)
IG1 relay dead (Gage #1, ECU, IG #1, WIP, WASH, A/C #2, S-HTR & ECU IG #2 will remain dead)
Main body ECU IG1D pin dead (E7 pin 3)

Well, at least everyone else will benefit from this interesting thread owing to your good details that were posted.

Lesson learned "Be real careful with the alternator and battery wiring. Double check everything before connecting"