No danger to adding extra grounds right?

Troubleshooting a minor (aka not charging) electrical issue and notice the factory diagram only has one earth ground.

I should be able to run an additional  earth ground from the frame to the battery with no issues right?

Yup. You can also add component grounds for extra redundancy. Ground from alt to grame and battery for example. Or starter to battery. 

That's correct. 

In reply to Grtechguy :

That’s exactly what Jaguar did. Every single electrical component had it’s own ground wire.  

Didn’t work so well. 

I'm going to say "no problem, but look up 'ground loop'" so you're aware of the *potential* (pun happily accidental) for issues.

I expect no problem, but I also expect not to solve something as fundamental as a non-charging issue by adding grounds (as opposed to making sure the existing one is as good as it ought to be).

In reply to Ransom :

I would agree a ground shouldn't be the issues,  but I believe the Generator is good and the Battery is new.

Ground loops may come into play for sophisticated electronics but that's generally not an issue for a car's charging system.  If the vehicle in question has a generator it's old enough that there's nothing electronic going on at all.

As an example of multiple ground connections, my '61 Bonneville came from the factory with four ground straps connected from the engine to the frame.

In my experience, any electric gremlins are caused by a funky ground. Adding more ground points is just adding more opportunity for electrical problems.

Only kidding.

If you grew up owning and fixing British cars, you wouldn't even be asking that question.  Still can't figure out why the British car industry feels bolting a wire terminal to a painted surface constitutes a good ground.  Stupid, stupid, stupid!

It is super common in the discovery II community to make every ground redundant.