Author Topic: 1974 GMC C1500  (Read 323351 times)

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #510 on: April 07, 2018, 06:03:31 PM »
Got a lot done, ran the front wiring harness including the lighting, horns, fan circuit and auxiliary battery terminals. I had to redo the link bars for the 4-link to get the correct pinion angle but that's all set now and dead nuts. I ended up having to order bars 2" longer to get it perfectly the way I wanted. I finished making the fan shroud and fan. Made it out of aluminum and tig welded the seams for rigidity. I seam sealed all of the edges and cut some u-molding for the sides to protect the radiator from fan vibration. I mocked everything up and tested the fan. All works great, took it back apart, did the finish trimming and clear coated it. Hopefully i'll get that all wrapped up tomorrow.



,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #511 on: April 09, 2018, 08:29:47 AM »
Finished mocking up and test fitting the fan. Works mint, I'll probably get it permanently mounted tonight.

After this I went through the old harness and pulled some of the pigtails to finally wire up the front lighting. I ran most of the wiring needed for the e-fan controls and just about everything else. Still lot's of fab work ahead

« Last Edit: January 15, 2024, 10:37:48 AM by VileZambonie »
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #512 on: April 15, 2018, 08:07:35 PM »
Got most of my front wiring done today. I drew up a little diagram for the fan control. I do have an adjustable relay as well but decided just to wire it up like this and see how it performs.

,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #513 on: May 03, 2018, 07:18:48 PM »
I have made a lot of progress, just finished test running my hidden wipers. It took a while to get all of this tucked into the cowl without interference. Lot's of trial and error but I am happy, will get it wired to the dash switch next. I hot wired it here to make sure all is well.

Okay so clearly the youtube function still doesn't work. Click Here for video

I also finished wiring up the remote terminals and am fabbing up a compartment door for that too. I took some other pics and videos. I'll have to upload them later.
« Last Edit: January 15, 2024, 10:46:50 AM by VileZambonie »
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline 54inches

  • New Users
  • Posts: 2
  • Newbie
Re: 1974 GMC C1500
« Reply #514 on: July 10, 2018, 08:48:46 AM »
Nicely done!  Photos of aforementioned hidden wipers?

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #515 on: July 10, 2018, 03:26:29 PM »
Thanks. Only the video at the moment but I'm sure I'll be posting more updates after Summer. I'm having too much fun working on other projects!
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18350
    • http://www.73-87chevytrucks.com
Re: 1974 GMC C1500
« Reply #516 on: October 04, 2018, 11:49:11 PM »
More info on the hidden wipers..

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #517 on: December 22, 2018, 06:48:02 PM »
Finished building the wiper wiring harness and making it work with the factory style dash switch however I couldn't use the 73-74 wiper switch. I had to modify the dash a little and used a 78 NOS wiper switch I had in stock which worked great. The 73-74 switch is case grounded and doesn't isolate low and high speed positions so that wouldn't work with this motor without mutilating the switch. With the large cowl I wish they would have done this from the factory instead of the big giant monster on the firewall. Nevertheless, I am happy to have this part done so I can move onto other items. My goal is to be back on the road this Summer with this truck. I think I've said that before.....Now that I'm in a different job after 16 years, I anticipate making some good progress again. PS having the Delphi Metri-Pack and Weather-Pack kits makes building a smart custom harness easy and nice. GM style connectors for everything which makes removal and installation nice and easy.
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #518 on: January 31, 2019, 05:10:08 PM »
I've been bad about posting updates and pics but I've been busy to say the least. Already burned through 3/4 tank of oil since it got cold out there. I reinstalled the AM radio and added an aux input. I did take pics as I couldn't find where anyone had done the mod to the AM radio so when I have time I'll post a how to. According to my spid label the truck came with AM only despite having every other option which is ...cool? lol Found some correct knobs to go with it and built a custom speaker out of the frame of the factory center speaker.

Finished building a custom heater box tucked under the dash with a 3 speed blower using the factory control panel. Ran all of the wiring for the audio system and I will have more pics of that later. Repainted the ash tray and glove box because they got trashed from sitting around so long. Overspray, scratches etc.  Even though I have new hinges on the hood they are already starting to spring. This drives me insane enough to spend the $700 bucks on billet hinges despite wasting the money powder coating and chroming these ones. Oh well

,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline fitz

  • Senior Member
  • ****
  • Posts: 2084
Re: 1974 GMC C1500
« Reply #519 on: February 01, 2019, 10:12:28 AM »
Nice job, as always.
Not trying to rush you, but keep in mind, the sooner you finish this 1, the sooner you get to start on the 75 K5 with the slotted rims.
Too many projects, never enough time...

Offline JohnnyPopper

  • Senior Member
  • ****
  • Posts: 2518
  • Old Goof
Re: 1974 GMC C1500
« Reply #520 on: February 01, 2019, 04:22:15 PM »
Nice Build VZ!

Where did you source your fan?

Nice touch spacing it away from your radiator, max volume through entire surface.

Thinking of dumping the boat anchor hanging off my water pump...

1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #521 on: February 02, 2019, 06:07:54 AM »
Nice job, as always.
Not trying to rush you, but keep in mind, the sooner you finish this 1, the sooner you get to start on the 75 K5 with the slotted rims.
Too many projects, never enough time...

I changed jobs after 16 years and will have more time to get caught up on everything. Having kids, night classes, the homestead, the endless responsibilities, I'm surprised I get anything done. I'm also building a few engines and transmissions right now as well. When I win the lottery and can quit my job, I'll get all of these things done  8)
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline VileZambonie

  • Global Moderator
  • Senior Member
  • *****
  • Posts: 18975
Re: 1974 GMC C1500
« Reply #522 on: February 02, 2019, 06:24:39 AM »
Nice Build VZ!

Where did you source your fan?

Nice touch spacing it away from your radiator, max volume through entire surface.

Thinking of dumping the boat anchor hanging off my water pump...

Thanks, the fan, I don't even remember, Summit I think? I made a prototype out of sheet metal and then replicated it in aluminum after I got it dialed in. Had to play around with temp switches to get it to come on and off exactly where I wanted it to but it works mint. I believe I settled on 170° on and 155° off screwed into the radiator petcock.
,                           ___ 
                         /  _ _ _\_
              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline JohnnyPopper

  • Senior Member
  • ****
  • Posts: 2518
  • Old Goof
Re: 1974 GMC C1500
« Reply #523 on: February 02, 2019, 07:43:56 PM »
Thanks for that, I'll check them out.

I'm impressed that a single fan can cool that beast 454, prob a combo of your shroud and its CFM.

So you found a temp probe to fit in that opening- I'll see if I can find that too.

I don't have the skill set to TIG weld, but there are some fabricators near my office.

I'll find someone to build one for me.

1957 Apache 3100 235 Inline 6, 3 on the tree
1973 C-20, 3+3 454 4BBL TH400  Water Injection
1978 K-10, 350 4BBL TH350 NP203 M.M. Part time Kit/Hubs
1980 C-10 under construction

Offline dine73ss

  • Newbie
  • Posts: 17
  • Newbie
Re: 1974 GMC C1500
« Reply #524 on: February 10, 2019, 12:18:14 AM »
cool truck! looking forward to more pics
1970 Chevelle SS 396/ 4 speed
1973 Chevelle SS 454 station wagon (factory 1yr only)
1966 Caprice 396
1979 C10 350/4 spd (factory 4spd/buckets/tach)
2004 Chevy SSR