84 wiper delay module same as 85-86?

[billlopez]

I have a Silverado 1984 with the factory delay wipers in the column. I only get lo/hi, so I went to the dealer to see if I could get a new module that sits under the column. The rep looked it up and said 84 is no longer available. He looked up later years and said they could order an 85-86 delay module. He said it should work because 84-86 use the same delay wiper switch part number. My question is, what is different about 84 that it has a different part number for the module and will the new 85-86 work in my 84 without burning out? Thanks.