Grounding a 12 Volt Fuse Block

Hunter450

I have searched threads and looked at many diagrams and the answer to my question may be hidden in plain site, so I apologize for my old eyes.

Question: The fuse block I'm installing has an integral ground buss. Do I need to run a ground wire from the (-) buss on the fuse block directly to the B- on my controller?

The reducer I'm installing has a ground wire on the 48 volt side that I'm connecting to the B- on the controller so I'm thinking the (-) on the 12 volt output side would go to the ground buzz on the fuse block and be grounded through the reducer to the B- so the OBC can account for the 12 volt draw.

BGW

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crash test dummy

does your reducer have a 12v neg out put ?
if it does you hook it up to the buss bar
and the reducer 48v neg to the b neg of the controller

Hunter450

Yes is does Crash and you confirmed my (- negative) thinking.

Now I have to determine the wire gauge size for the (+) 12 volt lead to the fuse block. The idiots provided a deutsch connection where on the reducer (receptor)side of the duetsch they provided ~12ga. wire (good!) but on the plug side of the deutsch they downsized to 16 ga. (not good!). BTW: 30 amp reducer.

Thanks for the help!

crash test dummy

i use 16g on all my wiring

here is how i would wire it

Hunter450

That's exactly how I'm planning to wire it. For the 12 volt cart lighting 16 ga. wire will be fine however, I'm installing a 12 volt accessory outlet so that lime green wire in your diagram will grow to a 12ga. for piece of mind.

crash test dummy

mrgolf

The 48 volt input wires will not have a 30 amp load, unless something shorts out. It will only be about 7 amps or so. The 30 amp is on the 12 volt side. That is why the idiots only used 16 ga wire on that side.

crash test dummy

who you calling an idiot ?

Hunter450

Yep, I agree on the 48 volt side but to reduce wire size to less than 1/2 on the 12 volt side at the in-line deutsch doesn't make any logical sense. They live amongst us!

Htownblue

This might be a dumb question but the negative bullet connector that comes standard near battery 1 in the club car sequence, connects to the negative ground on the controller correct?