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#1449419 Tue Apr 26 2022 12:41 AM
Joined: Dec 2019
Posts: 232
3
37 GC Offline OP
'Bolter
planning the rewiring of the '37. I'm going 12v with halogen reflectors which I understand should have relays and am in need of advice. Should the relays be wired in #1 between the fusebox and lightswitch #2 between the lightswitch and dimmer or #3 between the dimmer and the headlights requiring two (high and low beams). Also thoughts on the need for a horn relay.


Larry
All you need in life is TIME, PATIENCE and MONEY.
If you are missing one component, you'll need an abundance of the others two.
37 GC #1449571 Tue Apr 26 2022 11:43 PM
Joined: Mar 2014
Posts: 3,070
J
'Bolter
Horn relay is a simple answer. You must have one. The horn switch isn't designed to handle the amperage the horn needs by itself.

Headlight relays are a little more complex. You probably do need a relay (2 actually) with halogen reflector lights, but you need to think about it carefully. The way your truck is wired now, the headlight switch has a resetting circuit breaker built into it. That means should any short occur in your headlight circuit you won't blow a fuse (which is a one-time affair) but will allow your headlights to continue to work (intermittently) if there is trouble. You must continue with that scheme.

Here is how one fellow did it: http://audi.humanspeakers.com/headlight-simple.htm

You'll need 2 Bosch style relays (heavy duty--30 amp). Instead of using 20 amp fuses as he did, I would use one 40 amp resetting circuit breaker (split to the input side of each relay). but otherwise his circuit looks pretty ok to me. Important note: in his drawing, the yellow wire (stock low beam wire) is the wire controlling the low beam coming from your headlight switch and the high beam wire is the one coming from your high beam foot switch. Good luck.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
37 GC #1449684 Wed Apr 27 2022 07:32 PM
Joined: Dec 2019
Posts: 232
3
37 GC Offline OP
'Bolter
thanks Jon for the drawing. In essence you are saying #3 from my post with 30amp relays and 40 amp breaker. The old 6v deteriorated wiring I tore out showed no signs of a horn relay and was wired direct. possible on a '37? No fusebox of any kind and the only fuse was built into the amp gauge. Horn switch is just a ground through a heavy s wire under the button to a bearing ring in the steering column. rubber holding the button also serves as the spring. I will use a relay there also.

Last edited by 37 GC; Wed Apr 27 2022 07:53 PM.

Larry
All you need in life is TIME, PATIENCE and MONEY.
If you are missing one component, you'll need an abundance of the others two.
37 GC #1449704 Wed Apr 27 2022 09:43 PM
Joined: Mar 2014
Posts: 3,070
J
'Bolter
Hi Larry,
I think there is a relay on top of the generator going to the horn. One appears in the wiring diagram (below).

Yes, #3 on your post with 30 amp relays and a 40 amp resetting breaker. You may find both the low beam wire and the high beam wire come from your high beam switch. I believe this is the case and the wiring diagram shows this. Many were wired that way, so I'd expect it to be so. Good luck.

Attached Images
s-l1600.jpg (246.46 KB, 199 downloads)

Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
37 GC #1449706 Wed Apr 27 2022 11:03 PM
Joined: Feb 2004
Posts: 25,002
H
Kettle Custodian (pot stirrer)
Jon, the relay you're seeing on the schematic is the cutout relay for the 3-brush generator that prevents the battery from discharging through the generator with the engine stopped. It's just being used as a junction block to provide voltage to the horn, which operates only when the button at the steering wheel is grounded. There is no horn relay in that circuit. The upper right of that schematic illustrates the optional 2-unit regulator that includes a cutout relay and a voltage regulator. No current control with that system.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway

WAG MORE- - - - - -BARK LESS!
37 GC #1449723 Thu Apr 28 2022 02:19 AM
Joined: Mar 2014
Posts: 3,070
J
'Bolter
You're right, Jerry. Seems a good amount of current to run through a horn button, though.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
37 GC #1449725 Thu Apr 28 2022 02:33 AM
Joined: Feb 2004
Posts: 25,002
H
Kettle Custodian (pot stirrer)
6 volt systems are wired to take it. Much heavier gauge conductors, and beefy switch contacts. Then the train drivers and bean counters got into the mix and started making stuff that would just barely last through the warranty- - - -most of the time!
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self.
Ernest Hemingway

WAG MORE- - - - - -BARK LESS!
37 GC #1449820 Thu Apr 28 2022 11:00 PM
Joined: Mar 2014
Posts: 3,070
J
'Bolter
Yep, but you know the last 4 6v vehicles I owned all had horn relays and a person gets used to some things...a 1951 Ford Victoria, a 1955 T-Bird, a 1951 GMC pickup and of course the 1952 Chevy pickup. The T-Bird had twin horns (hi/low).


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
37 GC #1459166 Mon Jul 18 2022 12:44 PM
Joined: Sep 2015
Posts: 42
J
'Bolter
[img]https://www.stovebolt.com/ubbthread...ame/16581484370768063426679000570191.jpg[/img]If I may join in here. I purchased a double louder pair of horns for my 3100 years ago. It is powered directly to the battery +. If the battery- wire isn't good and secure the horn is sketchy. I have noticed that when sounding the horn the voltmeter certainly shows a discharge.

I have a 3 wire spade relay for the horn to install. I didn't see a wiring diagram or description of the hook up. On the side of the relay I see #1 then a switch a #3, then the resistance off of that and a #2. Embossed on the connection side with the wire spades I see #1, #5, & #3.

Any clarification on the wiring will be greatly appreciated.

Attached Images
20220718_085231.jpg (209.7 KB, 84 downloads)
20220718_085204.jpg (181.62 KB, 84 downloads)
Last edited by jameschevypu50; Mon Jul 18 2022 12:56 PM. Reason: Trying to attach photos..
37 GC #1459171 Mon Jul 18 2022 01:02 PM
Joined: Feb 2019
Posts: 2,814
AD Addict
I think you have basically the same relay as me. Here is a picture of mine that I labeled for clarity. (1) H is horn, (3) 12v is battery (in your case 6v) and (5) S is switch (horn button).

Attached Images
Last edited by Phak1; Mon Jul 18 2022 01:08 PM.

Phil
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