High beams won't turn on

[andrew]

I have 1988 d50 and my high beams won't turn on when I pull the switch. I have replaced the bulbs and still don't work.

[4doorciv]

Sounds to me like an electric issue. Did you check your fuses and fusable links? You got a test light or multimeter?

[andrew]

I checked the fuses and they are ok. But how do you check the fusable links I have a multimeter. Can it be a relay?

[4doorciv]

Fusable links are in a small black box near the brake booster. They are really easy to tell if they are broken. They get replaced but you make your own. Gotta buy a roll of the stuff and crimp spade connectors so they'll work. That is if they are broken.

[andrew]

Nope not the fuseable links they look fine I'll check the relay tomorrow cuz it's raining.

[4doorciv]

Is there 12v at the headlight with low beam as well as high beam? Are you sure it isn't the fuses? If it's not a fuse then it could be the switch or wiring harness. Glad you got a multimeter. Please update when you continue to diagnose.

[pennyman1]

Check the tension on the fuse socket for the high beam fuse and chek the back of the block for corrosion. After 22+ years the sides of the fuse holder gets weak and won't make good connection. windshield leaks are common right above the fuse block also.

[mikewarme]

Did you check to make sure the bulbs arent both out? I had that happen before. Otherwise for sure relay. Can't remmember where it is on the 2nd gen

[4doorciv]

is that where the water is coming from in my truck? I was ready to pull the carpet and make a few drain holes through frustration. Lol.