Any downsides to having a larger negative cable than your positive?

[Vicinity]

So, after about a million problems with electrical issues, I've found my issue is grounds. I have a TON of them but its not enough. So I bought a massive set of jumper cables (0/1) and connected the negative on my battery to the engine block and VIOLA, perfect everything. So I cut the ends off and put o ring connectors on it and life is perfect. Are there any downsides to having a larger negative than positive? I think the positive is 2 gauge. I had a 4 gauge negative wire running the same length and it didn't seem to work right, so went as big as I could find.

I guess it's important to note, I have a passenger side trunk mount.

[blitzer454]

No downside, except cost. If the battery is in the trunk then run the negative to the chassis instead of running a ground cable all the way to the block, then run a ground connection from the block to the chassis. The guage should be the same size as the positive, but having smaller guage wire will not hurt, just won't be any benefit.

[MonzaRacer]

the 2/0 negative , 8 gauge positive MIGHT cause charging issues or starting issues.

[Pancho79]

A large negative cable won't hurt anything. Do a setup like Blitzer suggested and you should be fine.

[Vicinity]

No downside, except cost. If the battery is in the trunk then run the negative to the chassis instead of running a ground cable all the way to the block, then run a ground connection from the block to the chassis. The guage should be the same size as the positive, but having smaller guage wire will not hurt, just won't be any benefit.

I have it grounded to the chassis, grounded to the radiator support, subframe, engine and a floorpan ground. The heavy duty wire was the only thing that made everything work perfectly.

Thanks guys, glad to know the car won't explode with a larger negative.

[MonzaRacer]

by the way I was joking

[Jerems]

No downside, except cost. If the battery is in the trunk then run the negative to the chassis instead of running a ground cable all the way to the block, then run a ground connection from the block to the chassis. The guage should be the same size as the positive, but having smaller guage wire will not hurt, just won't be any benefit.

Since he has already run from the battery to the engine block (is the battery in the trunk?) I would leave it, there is no down side to having a large jumper from the battery to the block except cost/weight of the cable. Make sure you add a Battery to Chassis ground at the battery though like blitzer454 said if the if it is in the trunk, you can never have too good of a grounding connection.