Best method for adding a fuse box/accessories?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

geocrasher

Full Access Member
Joined
Jun 14, 2018
Posts
113
Reaction score
122
Location
Northern NV
First Name
Ryan
Truck Year
1988
Truck Model
V1500
Engine Size
350
Hi everyone,

I want to add some accessories to the interior of my 88 Burb. There will be at least one USB charger, perhaps two, a CB, 2M amateur radio transceiver, and perhaps more in the future. I don't think I'll ever use more than 10A at once. What I'm thinking is to run a set of 12ga wires straight to the battery and then to a fuse block such as this:


Of course there would be a 30A fuse at the battery. I've also considered powering it through a relay energized by the ignition circuit in the fuse box using one of these connectors:


Does this all sound about right? Can anybody recommend a better way to add circuits to the truck without going through the stock fuse box? I don't want to tax the 34 year old wiring any more than necessary, and the radios need to go straight to the battery anyway. I appreciate any and all input. Thanks!
 
Last edited:

75gmck25

Full Access Member
Joined
Oct 13, 2016
Posts
2,034
Reaction score
1,829
Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
The way they did it on the ‘70s dual battery trucks with power to a camper or trailer was a relay and junction block on the driver’’s side fender.

The standard power junction next to the brake booster had an additional wire running over to a relay on the driver’s fender, and this relay was activated by an ignition-on wire. The output side of the relay only had power if ignition was on. The relay output side was connected through a fusible link or fuse to a 2nd power junction. All the camper or trailer power was connected there. You could use a similar wiring scheme up under the dash.

IIRC most of the old 10 gauge wiring in the truck is fused at 30 amps, which would give you plenty of power for accessories.
 

Italianwagon

Full Access Member
Joined
Apr 2, 2020
Posts
135
Reaction score
137
Location
Washington
First Name
Steve
Truck Year
1987
Truck Model
V20 Suburban
Engine Size
350
I did a painless performance accessory fuse box addition, hooked up to the secondary battery. Works great, no issues and has a side for ignition circuits.
 

67ventwindow

Full Access Member
Joined
Jun 8, 2022
Posts
65
Reaction score
75
Location
Missouri
First Name
Kevin
Truck Year
1986
Truck Model
C30
Engine Size
454
On my vintage cars I use a setup similar to this. That was usually with an alternator upgrade as well. I don't have to hack the existing wiring. I was hoping my truck being 20 newer wouldn't require anything like that but we shall see. I try to use water tight boxes, old cars seem to leak when you don't expect it.

You must be registered for see images attach
 

Originalthor

Full Access Member
Joined
Aug 22, 2021
Posts
1,023
Reaction score
3,418
Location
Saskatoon Saskatchewan
First Name
Scott
Truck Year
1989
Truck Model
Suburban
Engine Size
5.7
You must be registered for see images attach


Could build one of these too. The left side is power to relay and right hand side is power out from relay. Since I don't smoke the USB cig lighter and battery monitor went onto the astray. Sorry don't have a picture of that but can get one. And put the whole thing in the glove box.
 

Attachments

  • 20200521_222920.jpg
    20200521_222920.jpg
    154.6 KB · Views: 128

nvrenuf

Full Access Member
Joined
Jul 30, 2010
Posts
1,716
Reaction score
1,921
Location
Mobile, Al.
First Name
John
Truck Year
1991
Truck Model
K5
Engine Size
454
Blue Sea offers a lot of fuse panels, I just added one to my Blazer that had 2 sections- 1 12v constant and 1 12v ignition.
 

Camar068

Supporting Member
Supporting Member
Joined
Feb 5, 2014
Posts
4,152
Reaction score
3,006
Location
Kentucky
First Name
David
Truck Year
1986
Truck Model
K10/LM7 5.3/4L60e/np208/3.73/32"
Engine Size
10 yrs Air Force
seen some mount one mounted to the backside of the glove box. I need one to eliminate a bunch of wires thru the firewall....haven't got around to it.
 

nvrenuf

Full Access Member
Joined
Jul 30, 2010
Posts
1,716
Reaction score
1,921
Location
Mobile, Al.
First Name
John
Truck Year
1991
Truck Model
K5
Engine Size
454
I don’t have any hvac parts so I built a shelf behind the glove box.
 

Attachments

  • F1FA5875-E189-4224-B71C-8B02CC7A3752.jpeg
    F1FA5875-E189-4224-B71C-8B02CC7A3752.jpeg
    117.4 KB · Views: 95

geocrasher

Full Access Member
Joined
Jun 14, 2018
Posts
113
Reaction score
122
Location
Northern NV
First Name
Ryan
Truck Year
1988
Truck Model
V1500
Engine Size
350
Thanks for the replies and pics, these are all awesome ideas. Thank you so much!
 

plugugly

Full Access Member
Joined
Oct 6, 2023
Posts
59
Reaction score
27
Location
rocklin, ca
First Name
Damon
Truck Year
87
Truck Model
blazer
Engine Size
6.2 diesel
Hi everyone,

I want to add some accessories to the interior of my 88 Burb. There will be at least one USB charger, perhaps two, a CB, 2M amateur radio transceiver, and perhaps more in the future. I don't think I'll ever use more than 10A at once. What I'm thinking is to run a set of 12ga wires straight to the battery and then to a fuse block such as this:


Of course there would be a 30A fuse at the battery. I've also considered powering it through a relay energized by the ignition circuit in the fuse box using one of these connectors:


Does this all sound about right? Can anybody recommend a better way to add circuits to the truck without going through the stock fuse box? I don't want to tax the 34 year old wiring any more than necessary, and the radios need to go straight to the battery anyway. I appreciate any and all input. Thanks!
did this work?
 
Top