I have a clamp dc ammeter somewhere around here. I upgraded my 190E's alternator to 143A a few years ago and wanted to install a re-settable breaker. I bought one and installed it, found out it was tripping way early. I think it was 200A or something. Its sitting in my garage in a cabinet right now.

I doubt the electrical system is drawing more than 30-40 amps under normal driving conditions, especially in a early diesel with minimal electronics.

I wouldn't go too overboard with fusing everything. There are, for sure, somethings that ARE under-fused on these cars, like the auxiliary water pump.

I know that on the 126 560SEL, the wires leading to the ignition switch are 4mm and feed quite a bit of systems. The connector is pretty robust too.

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