While installing a new battery charger, I noticed our new to us 35-3 does not have a main DC bus. The battery negative, charger negative and panel negative are all brought back to one of the studs for the exhaust elbow. I would like to install a negative bus near the engine with a single connection to the engine. I've heard any solid place on the block without paint will work, but the exhaust elbow doesn't seem like a good spot. The cables look OK, but I'm thinking that is a potential week point given the high heat of the elbow. I'm wondering where everyone else is bonding their DC negative cable on the engine.