wire diagram

So i got the big 3 done today and this is how the shop did. Alternator to postive battery Then 2 grounds 1 from the battery to the chassis Then 1 from the engine to the chassis My question is was the engine ground supposed to run from the engine to the main battery? The wire diagram has...

Hey y'all I just purchased my 2024 kia sportage and of course I removed all my audio equipment from my previous car. I'm trying to get everything now in to my kia. But I'm not changing the head unit because a 2din will not fit. So I purchased an XLCA2 two channel line out-put digital bass...