Car Cranks but wont start after dead battery - immobiliser?

[alexjb1989]

Hey, I did not know overcharging was a thing!

How would I check this?

I pulled out all the fuses and all the metal bits seem in tact, so I think they are all fine. As for the relays, is there an easy way to tell?

I have put a multimeter on the battery and it reads 12.4V and does not drop below 10V when cranking