dumfounded

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.

Christine1985

Junior Member
Joined
Feb 12, 2025
Posts
2
Reaction score
3
Location
amarillo
First Name
juan
Truck Year
1985
Truck Model
10silverado
Engine Size
350
I am trying to find the best way to wire my alt but i for got where any of the wires go i guess i taped them long ago ,truck sat.forma.while an now i am tryin to figure out what the 2 red wires that i cut off.from the starter go to ,I ran the one wire to starter from bat, but now.i have no power to any thing there.was one red wire that i left hooked.up to the small connection on solinoide, i just tryin to.clean.up the wires by maybe eliminateing some that i problly need, lol since i am here I also have.my electris fans maybe.2 is to many ,should i down size.an the electric fuel pump ,an the electric watet pump i have them all routeing to one.wire to the batt from a toggle switch from each one, i know as soon as click the fan on an go to click the other switches to on u can hear the fan go down in power reduced i know this is a.lonf question an might have to broke down into several questions but who else would understand.me. but square bodies lol
 

Grit dog

Full Access Member
Joined
May 18, 2020
Posts
7,404
Reaction score
13,181
Location
Auburn, Washington
First Name
Todd
Truck Year
1986, 1977
Truck Model
K20, C10
Engine Size
454, 350
Welcome Juan.
A lot of knowledge here, you’re in the right place.
That said, you go a lot going on and likely some bad guidance or ideas along the way.
Starter wiring is easy. Someone will come along with a link to wiring diagrams or you can search this site. They are here.
Regarding the rest, it’s confusing why you’d be going with all electric components unless there’s a goal in mind (that literally doesn’t apply to 99.9% of old trucks unless you’re a drag racer and trying to squeeze out a few more hp).
For all that, do some reading on loads, wiring, amperage requirements. You’re setting up a system that’s drawing a lot of power and probably have undersized source and wiring based on your short description.
Also think about how simple a mechanical fuel pump, fan and power steering is. Compared to what you just described.
 

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,917
Reaction score
9,931
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
Now put all the wires back at the starter like you found them,2 of them were fusible links that provide all the power to the fuse box. Running all electrical loads to one source with a toggle switch is also a poor choice. As to wiring the alternator B+ goes to battery, terminal 1 goes to the the brown wire,that is the exciter wire,terminal 2 is voltage sensing wire which should go to the terminal block on the firewall,you could run it to battery + post it would be functional,but not as functional as factory. This is all from memory I will be double checking a couple of things,so check back later in case I need to edit. Okay,double checked,alternator wiring is correct.
 
Last edited:

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,917
Reaction score
9,931
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
Sorry electric fuel pump get a 4 prong relay from the parts store hook terminal 30 to battery + hook 87 to fuel pump. Hook terminal 85 to alternator exciter,hook 86 to ground. Now fuel pump will only run with the engine running. Same set up for fans but use a relay with a built in capacitor and hook 85 to a thermo switch.
 

Jgonick

Full Access Member
Joined
Jan 12, 2017
Posts
372
Reaction score
474
Location
West Texas
First Name
Joel
Truck Year
1985
Truck Model
K10
Engine Size
350

Attachments

  • 85.png
    85.png
    482.5 KB · Views: 3

Forum statistics

Threads
44,816
Posts
969,019
Members
37,612
Latest member
STEELPEGS
Top