Time crunch!! 05’ lx470 Accidentally reversed terminals. Cranks, no start!

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Joined
Jul 27, 2025
Threads
2
Messages
8
Location
Roswell Ga
Hope everyone is having a great pre-turkey day! But I am I. desperate need for some advice. As tomorrow is Thanksgiving and I’m supposed to be taking a 10 Hour trip from Georgia to Louisiana tonight!!
I changed my AC compressor and when plugging up the battery, the terminals were accidentally reversed. Several fuses were burnt, but I’ve replaced them. When turning the key on everything seems to work. I do have fuel pressure. But I do not have spark.
My key fob works for locking and unlocking the vehicle so I do believe that the theft system is fine and possibly the mobilizer is good.
Has anyone experienced this issue?! Any help would be greatly appreciated!

I’m currently taking apart the fuse box to see if there’s anything… But so far it looks good. Turns out there’s a bunch more relays that are irreplaceable within the fuse box. Pictures are attached…

Ps. My apologies if this is not in the right thread or something like that. This is my first Forum I’ve ever joined and this is my second time ever coming onto it.

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are the big fuses off the battery good?
are all the fuses in the driver kick panel good?
 
Do you have a code reader? See if you could see data or codes, check power to alternator and the main fuse panel. I'm hoping you didn't spike the ECU.
 
What make/model/year. I have an 2000 LX. I have never seen something like the set up you have.

EDIT:

Sorry. you have that in the thread title. Sorry. I have no idea what this. Is it stock?
Yes 100% stock. When you start taking apart the fuse box, this is what’s inside. Shocked me too…
 
Hope everyone is having a great pre-turkey day! But I am I. desperate need for some advice. As tomorrow is Thanksgiving and I’m supposed to be taking a 10 Hour trip from Georgia to Louisiana tonight!!
I changed my AC compressor and when plugging up the battery, the terminals were accidentally reversed. Several fuses were burnt, but I’ve replaced them. When turning the key on everything seems to work. I do have fuel pressure. But I do not have spark.
My key fob works for locking and unlocking the vehicle so I do believe that the theft system is fine and possibly the mobilizer is good.
Has anyone experienced this issue?! Any help would be greatly appreciated!

I’m currently taking apart the fuse box to see if there’s anything… But so far it looks good. Turns out there’s a bunch more relays that are irreplaceable within the fuse box. Pictures are attached…

Ps. My apologies if this is not in the right thread or something like that. This is my first Forum I’ve ever joined and this is my second time ever coming onto it.

View attachment 4037645

View attachment 4037646

Hope everyone is having a great pre-turkey day! But I am I. desperate need for some advice. As tomorrow is Thanksgiving and I’m supposed to be taking a 10 Hour trip from Georgia to Louisiana tonight!!
I changed my AC compressor and when plugging up the battery, the terminals were accidentally reversed. Several fuses were burnt, but I’ve replaced them. When turning the key on everything seems to work. I do have fuel pressure. But I do not have spark.
My key fob works for locking and unlocking the vehicle so I do believe that the theft system is fine and possibly the mobilizer is good.
Has anyone experienced this issue?! Any help would be greatly appreciated!

I’m currently taking apart the fuse box to see if there’s anything… But so far it looks good. Turns out there’s a bunch more relays that are irreplaceable within the fuse box. Pictures are attached…

Ps. My apologies if this is not in the right thread or something like that. This is my first Forum I’ve ever joined and this is my second time ever coming onto it.

View attachment 4037645

View attachment 4037646
Update!!! Problem solved!! When removing the AC I must’ve pulled on the crank sensor plug. It came undone. I plugged it back and she fired right up!!
Thank you all for the help! Happy Thanksgiving! About to hit the road now to Louisiana!

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