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Finishing up a rewire....and some questions
#1398453 Tue Feb 23 2021 03:57 AM
Joined: Jan 2020
Posts: 46
J
Wrench Fetcher
Well, I'm tidying up after my complete rewire of my '66 C10. I've got some small problems that I've got to track down, probably mostly grounding problems, but who knows.

Anyway, I need some help with these 2 boxes that are located on the radiator support wall. Both are located next to the horn and behind the wiper/washer bottle. Can someone help me out? I know at least the small one had wires going to it before. But I don't have any spare wires, what am I missing?



The second pic is of the boxes prior to me starting the rewire....wires from everywhere, but none now. The only one that is still there, although not connected is the red wire as it comes directly off the battery.

Attached Files
PXL_20210223_023138646.MP.jpg (91.88 KB, 168 downloads)
PXL_20201215_221236688.jpg (179.07 KB, 166 downloads)
Last edited by jtroberts; Tue Feb 23 2021 04:09 AM.

"The greatest use of life is to spend it on something that will outlast it" ~ William James

'25 Chevy Superior
'66 Chevy C10
'03 Chevy Silverado 1500 HD
Re: Finishing up a rewire....and some questions
jtroberts #1398466 Tue Feb 23 2021 11:16 AM
Joined: May 2007
Posts: 1,523
Shop Shark
Will wait for others to come on and tell you about the individual wiring, but you are dealing with the horn relay and the voltage regulator respectively.


HB

1966 Chevrolet K-10
Flappy Fenders
In the Stovebolt Gallery [stovebolt.com]
More pictures on Photobucket [s160.photobucket.com]

1962 Chevrolet C10
1962 Suburban
Re: Finishing up a rewire....and some questions
jtroberts #1398481 Tue Feb 23 2021 01:38 PM
Joined: Jan 2020
Posts: 46
J
Wrench Fetcher
Thanks Hambone. So, since I have a newer integrated alternator, does this mean that I no longer require the regulator?

As for the horn relay, I wonder if the hot wire should still go to the relay and the wire that I have going directly to the horn should go to the relay first?


"The greatest use of life is to spend it on something that will outlast it" ~ William James

'25 Chevy Superior
'66 Chevy C10
'03 Chevy Silverado 1500 HD
Re: Finishing up a rewire....and some questions
jtroberts #1398485 Tue Feb 23 2021 02:02 PM
Joined: Jun 2011
Posts: 3,881
E
Shop Shark
No longer need voltage regulator. Did you record what came and went to the horn relay when you took it apart? Horn relay should have a signal wire from the horn button that would be small. Plus voltage from source and output to the horn itself should be larger wires. If the wires were cut, the remainder held in the wire crimps should give you a clue as to color and gauge. Red is normally used for source. A wire diagram from any similar age GM truck should apply.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
Re: Finishing up a rewire....and some questions
jtroberts #1398488 Tue Feb 23 2021 02:10 PM
Joined: Feb 2019
Posts: 1,303
P
AD Addict
In addition to the wire coming from the steering wheel, the relay requires a 12v hot wire from the battery or possibly the fuse box. It should be a larger wire like 12 gauge wire to power the horn. The relay also requires a ground.

Maybe a fellow “Bolter” can post a wiring diagram of your truck.


Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
Re: Finishing up a rewire....and some questions
jtroberts #1398533 Tue Feb 23 2021 08:57 PM
Joined: May 2005
Posts: 7,836
B
Sir Searchalot
1. As said, take off the voltage regulator and all it's wires. Not used.

2. You can hook up your alternator as a one wire or a "three" wire. Three wire is better. Depends on what charging meter/indicator you have. (gauges or idiot lights). If you have questions about the alternator. Post the vendor and part number of it.

3. The horn relay is shown on the AAW wiring diagram. Wire it per the diagram. Observe the Red, the Green and the Black wires on the diagram. If you have any questions, I have the diagram and can answer them.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
You can't teach a new dog old tricks.


Re: Finishing up a rewire....and some questions
jtroberts #1398539 Tue Feb 23 2021 09:35 PM
Joined: May 2007
Posts: 1,523
Shop Shark
wiring diagram

Attached Files
1965_chev_truck_wiring_diagram.pdf (109.99 KB, 15 downloads)

HB

1966 Chevrolet K-10
Flappy Fenders
In the Stovebolt Gallery [stovebolt.com]
More pictures on Photobucket [s160.photobucket.com]

1962 Chevrolet C10
1962 Suburban
Re: Finishing up a rewire....and some questions
jtroberts #1398542 Tue Feb 23 2021 09:44 PM
Joined: May 2005
Posts: 7,836
B
Sir Searchalot
Yes, it is useful to keep one eye on the original diagram while trying to follow the harness company's diagram and instructions. It this case regarding Alternator, VR and Horn Relay questions, it's better to follow the AAW diagram.

Jtroberts: Do you see the two blade contacts on the horn relay? The two are perpendicular to each other and are at the top in your pic. You should have a connector pig tail with a black and a green wire in the kit that should plug right onto those. The double screw, large terminal on the relay is for the red wire seen on the horn relay in the AAW diagram coming from the fuse panel. The screw terminal is also used as a "junction block" for other hot wires if needed. As you can see on the AAW diagram, the black comes/goes to the column connector and the green goes to the horn trumpet terminal. You probably have a single contact connector for that horn terminal.

Clean the contacts on your relay.

FIY: Most harness kits have the wire marked every foot or so as to what is is, along with the color. Sometimes individual wires for various uses and the small pigtail (harnesses) with connectors or sockets on one end, do not have markings stamped on them.


Watch out for careful drivers!!!
I'm away on an ego trip. Will be back on Feb 30.
I'm not an Auto Mechanic, but I play one on TV.
I charge $0.02 for every opinion and I take Paypal.
Plan B is always better than plan A, by definition.
You can't teach a new dog old tricks.


Re: Finishing up a rewire....and some questions
jtroberts #1398555 Tue Feb 23 2021 11:46 PM
Joined: Jan 2020
Posts: 46
J
Wrench Fetcher
Thanks guys.

This is specifically in reference to the horn.
I've only got a dark green wire coming out of the firewall for the horn. The other wires per the AAW diagram are lt green, dk green and tan and an orange wire for an electric fan, which isn't currently used. There is no black or red wire, nor does it show it on the AAW diagram #500558.

I do have a red wire that goes straight to the battery that I have connected to the screw terminal. There is also a ground wire attached to the chassis for the horn relay. Both of these were there before I started.



A separate question, what is this in the pic below?

Attached Files
PXL_20210213_231547652.jpg (95.11 KB, 85 downloads)
Last edited by jtroberts; Tue Feb 23 2021 11:46 PM.

"The greatest use of life is to spend it on something that will outlast it" ~ William James

'25 Chevy Superior
'66 Chevy C10
'03 Chevy Silverado 1500 HD
Re: Finishing up a rewire....and some questions
jtroberts #1398586 Wed Feb 24 2021 03:36 AM
Joined: Oct 2005
Posts: 3,130
"Hey! I sound like Darth Vader!!
That looks like a relay.

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