1988RD690S front parking lamps

[Casper1988]

I bought a stock parking lamp ( front fender ) with the wire leads that go to the fire wall electrical junction board and wondering what # are those connections on the board. I am a one man team and hard to flip switches and run the test light at the same time. thanks. I have no schematic. I have junction boards on both sides of the firewall. 

Edited January 5, 2019 by Casper1988

[Vladislav]

That firewall junction block schematic seems as a big mistery. The question was shown up a couple of times but no good resopnse as long as I can remember. So better switch the turn light in the cab on and put your test lamp to the terminals.

[Casper1988]

Thank You Sir, I have been searching via internet and yes, that info seems not attainable. Guess my honey will have to help with this one.

[j hancock]

You can check out this 1983 R wiring diagram.  Click on the pdf.

https://www.bigmacktrucks.com/tutorials/article/55-r-model-wiring-diagram/

 

[Vladislav]

I looked over that diagram and found out my 1988 R had differences to it. I can't tell the reasons for 100% sure but can state it didn't work for me.