Hello, new here, so if i just couldn't find a previous thread my apologies. I'm wondering if anyone has a pdf of the manufacturer's headlight schematic/wiring diagram on a '90 W250 318 4x4. Aftermarket snowplow lights just quit, markers and turns ok, tailights etc ok. Its a Canadian truck with DRL module disconnected, but lights still worked. Stock headlights were disconnected and harness hooked to aftermarket plow lights harness, worked for 4 years. I have the Chilton's 89-96 and Haynes 74-93, but neither give a really clear ( to me ) diagram of the lighting schematic in a stand alone pdf. I'm suspecting ? fusible links, but a complete diagram would sure help the troubleshooting as the wiring is pretty ugly under the hood and color matching is just about pointless.

Thanks.