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*gmachinz* · 06-17-2018, 03:49 PM

Some reference pics of the 78-83 pulse/wiper switch upgrade on this ‘77 GMC. I’ve already added my upgrade sub-harness kit so modding the dash by slightly opening up the existing wiper spot to accomodate the bigger switch. It really doesnt take much-I used a templet matching the 78-83 switch body, opened up the basic cuts using a dremel, then used an assortment of small flat files to smooth out the edges. Then, slide the 78-83 switch in, mark the 2 new mounting spots, drill them and they secure the updated...easy-peasy.

06-17-2018, 03:49 PM	#2
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: Project update on 1977 GMC High Sierra Ole Farm truck Some reference pics of the 78-83 pulse/wiper switch upgrade on this ‘77 GMC. I’ve already added my upgrade sub-harness kit so modding the dash by slightly opening up the existing wiper spot to accomodate the bigger switch. It really doesnt take much-I used a templet matching the 78-83 switch body, opened up the basic cuts using a dremel, then used an assortment of small flat files to smooth out the edges. Then, slide the 78-83 switch in, mark the 2 new mounting spots, drill them and they secure the updated...easy-peasy. Attached Images