Dangerous?

I would review the MAD article. If no other reason it has a good simplified diagram, and an overview of problems with the ammeter/ bulkhead circuit.

Catalog

amp-ga18.jpg

One issue is circuit protection IE no fuse or breaker. "All you have" is the factory fuse link which is NOT adequate many times. Also the bulkhead connector is lame for current capacity and never was heavy duty "enough" for much added accessories. In other words you need to fix/ upgrade what is there.