BIG 3 question

[devin601 10+ year member]

I did the BIG 3 yesterday and forgot to do the chasis to engine block. Is that ground necessary as it seems like you just grounding a ground. If so why? and is the chasis just any metal part under your hood? Also, do the engine ground and battery ground have to be on the same chasis bolt?

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[retrojordans 10+ year member]

[video=youtube;p82xRzCr-lc]

 

[Fightingeagle12 10+ year member]

I’m no big 3 expert, but I’ve always wired the battery to the chassis and a separate wire from the battery to the engine block. I’m not really sure why the engine needs to be grounded to the battery. The chassis is the solid metal and to make a good connection it’s important to file off any paint or crud to get a good metal to metal connection.

 

[devin601 10+ year member]

ok thanks. im just going to run one from the battery to the engine blocl.

 

[fasfocus00 5,000+ posts]

it assure a good ground throughout as ignition components are grounded to the engine block.

 

[thevic24 5,000+ posts]

it assure a good ground throughout as ignition components are grounded to the engine block.

This and the alt is attached to the block as well. It will just help make your charging system more efficient.