Grounding accessories to Body or Frame

[Ronjon]

I'm going to be mounting one of those 10.6cfm twin piston air compressors (maxi trac, morrflate, stop n go, thor) inside my cab for onboard air. My question is can I ground it to the body, should I run a bulk head and wire to the frame, or run it with the positive back to the bay and ground out on the frame there?

It has a 90Amp peak draw and I'll be running 6 AWG wire, it will be fused and run through a switch box to a 200a relay. I know in the past people will ground winches to the frame or body, but with all the computer stuff going on I've got this concern on the back of my head.

 

2020 1500 Silverado LM2

[Ronjon]

Follow up question for anyone here. If I make a separate negative terminal block for ground. From where do I pull from? I understand pulling straight from the neg battery terminal can be a no no due to the voltage sensing equipment for charging being circumvented. If someone can identify where that is in the Duramax engine bay I would be appreciative and I'll post follow up photos when I add a bus bar. I plan on running 2AWG from it to the passenger wheel well for accessories.

[cwtech]

I suggest grounding to the engine block is more desirable than grounding to the frame or body.

[Ronjon]

56 minutes ago, cwtech said:

I suggest grounding to the engine block is more desirable than grounding to the frame or body.

A buddy of mine that builds engines suggested the same! I think that's my best route to be as safe as possible.

[Jordan Bolster]

On 2/19/2023 at 10:19 PM, Ronjon said:

I'm going to be mounting one of those 10.6cfm twin piston air compressors (maxi trac, morrflate, stop n go, thor) inside my cab for onboard air. My question is can I ground it to the body, should I run a bulk head and wire to the frame, or run it with the positive back to the bay and ground out on the frame there?

It has a 90Amp peak draw and I'll be running 6 AWG wire, it will be fused and run through a switch box to a 200a relay. I know in the past people will ground winches to the frame or body, but with all the computer stuff going on I've got this concern on the back of my head.

 

2020 1500 Silverado LM2

No word from general motors about this faulty frame and general motors knows it faulty that why they are running away from this and told me it save to drive the gmc mechanic told they cannot drive it so what's going on with general motors covering over this problem and not putting a recall on vehicle a ERT TOLD me it a faulty chassis and gmc mechanic told me right off the truck and ran away from this too like general motors in the US they told me to bring the vehicle the gmc dealership in michigan and canada gmc mechanic told me too scrap the truck and no sign of general motors 

[silveradosid]

jordan instead of high jacking other post with your frame problem, post some pictures in your own post so we can see wtf you are talking about.

[Jordan Bolster]

On 2/21/2023 at 8:30 PM, Ronjon said:

A buddy of mine that builds engines suggested the same! I think that's my best route to be as safe as possible.

 

[Jordan Bolster]

Just now, Jordan Bolster said:

 

General motors canada told me it 100% to drive the vehicle and it is a manufacturing problem General Motors not standing over it