VZ Won't crank after reverse battery

[rhysu]

Hey guys, I signed up since everyone of the threads i was reading from here had mixed results due to different causes making the same symptoms... anyway, I got a VZ ute for nothing if I can fix it and the story is the previous owner put a new battery in and connected it the wrong way for a split second before realising what he had done after the sparks flew at him. He left it for a bit and reinstalled the battery the correct way (he is old mind you and sight is not the best)
The ignition turns on and all the interior accessories work, lights, windows, stereo, instruments etc but it won't crank. No ticking, no drain of power etc. I put my OBD2 connector on it and connected to the ecu fine but pulled up no fault codes after scanning it twice.
At the same time it is reading "Fuel Gauge Error" and "Service Vehicle Soon". All the fuses have been checked and all relays replaced with working ones from other vehicles I own.. Yet still a mystery.
Was wondering if anyway was able to shed some light on it at all.

 

[CONROD]

Have you checked the fusible links in the fuse box under the bonnet. If think not having the ignition on has saved everything from sudden death that's why its all still o.k

 

[illlusion]

Bcm probably fried you will need to relink the bcm with ecu if you get another one or it won't work tech 2 or similar will be needed to make the link up

 

[rhysu]

Yeah checked the fusible links in the fuse box. They're all perfectly fine.

 

[99notout]

How much fuel is in the tank?

 

[rhysu]

Enough to start.. Wouldn't stop it from cranking though....

 

[vc commodore]

Have you checked you're getting power to the starter solenoid, when trying to crank? If not, check for power to and from the relay, and the fuses, starting from the solenoid area, back to the ignition switch....

If you're getting power there, under cranking, good chance the starter is fried....Replace the starter and you should be good to go.

 

[Trayner]

Ground wire at the back of the engine , at the back of the passenger side head . or starter is dead

 

[Eevo]

manually bridging the starting will tell if its working

 

[alloytec sludge]

manually bridging the starting will tell if its working

remove starter relay and bridge it to crank