Battery ground ?

[MKEELINE]

I'm sure this has been asked a million times, but here goes a million and one.
I'm putting in a new Perko switch(old one had a crack) and have a question about the grounding. In the directions, for 1 engine and two batteries, it says to ground the batteries to each other. Previously, they were grounded to the engine block. Which is better?

[Mr. Naudio]

I'm sure this has been asked a million times, but here goes a million and one.
I'm putting in a new Perko switch(old one had a crack) and have a question about the grounding. In the directions, for 1 engine and two batteries, it says to ground the batteries to each other. Previously, they were grounded to the engine block. Which is better?
pretty much the same the engine will act like a big distribution block
out of habbit I always put one from bat to bat though

[MKEELINE]

Cool, thanks for the help guys. I think I'll just keep it the way it was. The batteries are on opposite sides of the driveline, so I think it's better to ground each battery to the block.