I have a just broken-in 1988 300E (336,000 miles)
My major problem right now is that I am burning up
the ground pin on both headlamps. The problem occured
years ago with the stock connectors and DOT approved bulbs (dull). I replaced them with 80-100 bulbs a few years ago along with a custom heavyduty wiring harness from Competition Bulbs. The problem went away but is now back badly burning up connectors as fast as I can buy them. I am now only using DOT approved 9004 bulbs, the heavy duty harness and a heavy duty ground wire directly from the connectors to the battery "-" post. I had this problem start years ago with the factory connectors and bulbs.
Any ideas? Thanks