Wiring Question

[toyotacorolla]

When I got my big 3 done from an audio shop they connected:

1) alt to battery positive

2) negative battery to chassis of car

but on the third wiring of the big three they connected engine block to chassis, isn't it supposed to be engine block to battery negative? does it make a difference? thanks in advance.

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[Bettr n' Revrse 5,000+ posts]

Wrong section

 

[jpassage24 10+ year member]

no it doesnt make a difference they are both going to the same ground....