C30 cab running lights question

[Dan H]

I have an 85 C30,with cab running lights,I like them to work..lol,where do the u wire in?,I've checked(unless I missed it) my headlight switch plug(need to replace the switch)seems no part of the plug operates Them..it is possible. ALL of them are burned out I've not gone up there and checked yet..anyone??..Dan...

 

[Westislander]

Tapped into the same feed for parking lights

 

[Colin]

3 of the 5 clearance lights were burned out on my truck before I bought it.
The owner replaced them the day I picked it up.

 

[Charlie]

 

[Dan H]

Thank you,kinda what I was thinking,I been working the truck allot,as soon as I got her,runs,drives great.but I get into that..thank you lotsas.."keeping chevyin"..lol

 

[Big Chip]

It is probably bad grounds too. They are grounded to the cab roof, at least on the older trucks and the clips get rusty.