Unfortunately, the manual does not have any info on this switch which is not surprising as they were not detailed back then on these types of repairs.
However, here is a link to a replacement switch:
https://www.rockauto.com/en/catalog/ford,1979,e-150,5.8l+351cid+v8,1110430,electrical-switch+&+relay,toggle+switch,138
I am attaching the info that they do have which is very limited. I added some info on this from a newer van which gives a little more detail but again, this is very limited.
Please review this and let us know what specifically you are needing, and we can figure it out. I assume you just need to install it and if that is the case then this should get that completed.
Thanks
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Wednesday, November 17th, 2021 AT 7:54 AM