1981 wiring question

BDCCLARK

Member
LIFETIME
City
gravois mills
State
MO
#1
Somewhere upstream in the ownership chain of my 81 there was someone who really thought they were a better electrical engineer than the manufacturer.

My harness is littered with male/female spade connectors from front to back. I've removed all sorts of unnecessary wiring so far. I had a stand alone horn button with a dual aftermarket horn setup. Nothing special, but it was there and working. Inline fuse off solenoid for juice to the stand alone switch and back to the horns. My factory horn button and relay work fine, so I wired it back to the steering wheel button.

My concern is where my horn power comes from. There is no horn fuse. No fuses kill the power to it either. My best guess is it runs off the main headlight power circuit and is safety controlled with the fusible link. Yes/no?

Where is this fusible link? My guess is right off the solenoid, but again, my jeep has a much smaller wire there with a spade connector.

Positive information or even a picture would be fantastic help.

Chris
 
City
Halifax
State
UK
#3
You are correct it is off a fusible link i have highlighted it in yellow. and looking at the drawing it must be on or adjacent to the starter solenoid.
So it sounds like you already knew the answers and just wanted some confirmation. 8-)

Hornrelay2.png
 

BDCCLARK

Member
LIFETIME
City
gravois mills
State
MO
#4
That looks like a great schematic. Where is it from?

You are correct, I was pretty sure, but I like to see schematics and I don't have one yet. How do we know what size it is?

Thank you Dave, Chris
 

BDCCLARK

Member
LIFETIME
City
gravois mills
State
MO
#8
The fusible link to the alternator is still there. The other one going straight to the headlights and such is just a wire with a spade terminal connecting it. :poop: work by someone who should find a new hobby. I hope whoever did it was a hobbyist and not a professional.

Chris
 
City
Halifax
State
UK
#9
Oh dear that does sound like a fire waiting to happen, luckily you found it.

For sizing fusible links i have no idea how the automobile manufacturers do it but i would work out how much load is on the link and then add a good healthy chunk of amps on top as it should be a last resort thing and never intended to blow in normal conditions.

Does make you wonder why its not there now though? whether they didn't know what it was or had actually blown who knows!
 

BDCCLARK

Member
LIFETIME
City
gravois mills
State
MO
#10
I agree. It's anyone's guess on why it's gone. On the bright side, I'm bringing it back to proper everyday.

Thanks for the help Dave

Chris
 
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