Topic Sponsor
Pre- 1987 / Classic Corner Have a classic Ford F150 truck? Want a classic? Discuss your pre-1987 Ford F150 truck.

1976 F-150 fuse block wiring problem

Old 02-11-2019, 03:07 AM
Junior Member
Thread Starter
Join Date: Feb 2019
Posts: 2
Liked 0 Times in 0 Posts
Question 1976 F-150 fuse block wiring problem

Trying to do a quick swap out of the OE glass fuse, fuse block for an aftermarket generic blade style. I know all the wiring colors and what fuses the wires went to but I just need to know which wires are to be connected to the main positive and main negative if it was set up that way originally. Could I be going about this all wrong and just not seeing it and should I go with a different fuse block than the one I show below?

Back of OE fuse block:

Aftermarket fuse block I would like to install:

Thank you for any and all help to this newbie!
Mrbig8little is offline  
Old 02-11-2019, 10:43 AM
Bronco Guru
Steve83's Avatar
Join Date: Jan 2018
Location: Memphis, TN, Earth, Milky Way
Posts: 3,577
Liked 413 Times in 380 Posts

The original fuse block has several supplies: battery (constant power), ig.sw. (key-on power), headlights (dash backlighting), and maybe more. To ID them, you'd need the truck's wiring diagrams. But Ford was pretty good about wire color standardization, so you can try looking them up on this & the NEXT few pages:

(phone app link)

The diagram you posted has only 1 supply, so it can't mimic the original. And since the truck uses grounds for negative/return, the negative buss on that block would be wasted. That block would be good for a boat or something else that can't be grounded.

For your application, I'd look for a newer OE fuse block in a JY, and configure it the way you need. You might want to grab a few identical blocks so you'll have all the terminals you need. Click this & read the captions:

(phone app link)

Almost all pre-'04 OE fuse blocks are reconfigurable, similar to those. So browse around for the style & size that suits your needs - not necessarily a vehicle brand. Older vehicles will have fewer fuses, like yours; but they may also use older-style fuses, like yours. So you might have to grab a larger block than you need to get the fuses you want. Many newer blocks use several fuse sizes, which would be helpful if you want the ability to add heavy circuits. If not, the smallest newer fuse will handle everything that came on your truck. Study this:

(phone app link)

Its caption describes modifications more-complex than you probably plan, but it's good to at least skim through it to familiarize yourself with the considerations.

Last edited by Steve83; 02-11-2019 at 10:45 AM.
Steve83 is offline  
The following users liked this post: Steve83
Mrbig8little (02-11-2019)

Thread Tools
Search this Thread
Quick Reply: 1976 F-150 fuse block wiring problem

Contact Us - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: