"It worked for about 10 minutes then ended up melting a couple wires in one of the rear taillights and did something to my headlight switch, after replacing the melted wire and the Hella control box, when I turn on my headlights, my dash lights and license plate lights dont come on unless I push in on the switch or turn on the fog lights."

Do You realize you're driving a Car-B-Que ?

UNTIL you find and Rectify the Problem.

"replacing the melted wire and the Hella control box"
Ain't finding and fixing the Problem !!!

When that W124 on the "Ro-Ro"waved "Bye,Bye" to Cuxhaven enroute to CONUS it didn't have the "Optional" Igniter Y'all've
seen fit to equip it with.

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'84 300SD sold
124.128