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Hi,can somebody guide me on the wiring for the heater blower.I took everything out to repair the core and now i can get the blower to work.It s not damaged,i checked it with a battery.Something is wrong with the wiring.
If anybody got some pictures it would be even better.

One more silly question.Does the engine need to run for the blower to work?

That's definitely true of what we call the "2nd generation" trucks. They have to be charging for the relay to close. I suspect yours should be the same.

Jack

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'83 Isuzu P'up Diesel LS - Original Owner
JoeIsuzu@IsuzuPup.com
IsuzuPup.com

Hope that is that.Tomorrow i will fill the radiator coolant and start the engine to try it.
About the resistor i saw some pics here of one with 3 pins and a cable.
Mine has 2 pins and the blue cable.Does that blue cable goes to the blower?
The switch from the controller has a single blue cable also.Where does that goes?

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Previously owned 2 Luvs) 75 & 77 Fleet-side
3rd 77 Step fixing up aka The Yellow Submarine to Luv Ms (Sun)Shine=)
98 GMC Gas Guzzler~>The reason 4 my ~>3rdLuvNext2a66MALIBU =)
66 Chevelle The Oldest of all the vehicles I owned

My luv is a 1980 greek import single headlight with the g161z motor and front drums.
Your photos were the reason i got my heater core out after i saw the dirt in yours.Also it was a good time to clean/repair it.
I will post a pic of my resistor tomorrow.
Does your switch have a single blue wire?Do you remeber where it goes?
Does your blower work with the engine not running?

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Previously owned 2 Luvs) 75 & 77 Fleet-side
3rd 77 Step fixing up aka The Yellow Submarine to Luv Ms (Sun)Shine=)
98 GMC Gas Guzzler~>The reason 4 my ~>3rdLuvNext2a66MALIBU =)
66 Chevelle The Oldest of all the vehicles I owned

Back with updates.Finally there is a brown wire under the ash tray that powers the blue wire int he switch and from there you control the blower.
The blower works with the engine off.
My controller has 2 speeeds and maybe thats why my resistor is with 2 terminals.
So that problem is solved
Next thing is the gauges,i ve noticed 2 terminals in the back(check the photo).But there is only one wire that plugs in the one behind the fuel gauge and i think that is for the temperature. Anybody knows what is the other for?
The brake light on the dash what is it for?Is it for the e-brake?Is there a switch somewhere?I remeber mine working but now is dead.(checked the bulb and it is ok)

here is the pic from the dash

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Previously owned 2 Luvs) 75 & 77 Fleet-side
3rd 77 Step fixing up aka The Yellow Submarine to Luv Ms (Sun)Shine=)
98 GMC Gas Guzzler~>The reason 4 my ~>3rdLuvNext2a66MALIBU =)
66 Chevelle The Oldest of all the vehicles I owned

_________________
Previously owned 2 Luvs) 75 & 77 Fleet-side
3rd 77 Step fixing up aka The Yellow Submarine to Luv Ms (Sun)Shine=)
98 GMC Gas Guzzler~>The reason 4 my ~>3rdLuvNext2a66MALIBU =)
66 Chevelle The Oldest of all the vehicles I owned

So your blower is always working at low speed? Can t understand why the designed it that way.
The blue wire on mine is also on the air.
At the back of the dash i got 2 wires that don t plug anywhere as at the back of the glove box there is a 4 cable conector on the air.
Maybe someone with the newer gauges can help me.

The low speed blower always on is a safety deal for carbon monoxide build up, IIRC. The brake light should be illuminated by a pressure switch on the brake system. Either a combination valve, where all the lines branch off, or on the master cylinder, usually. (I don't have stock brakes on either LUV, so I can't chase it down for you any better than that.) It is an indicator of low brake pressure. Not all connections will be made on the harness, as not all trucks had the same options...

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If you think no one cares, try missing a couple of payments...



FIAA!

SFPP!

On all of my LUV trucks(76-80) the brake light is an e-brake indicator.

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"You can't please everyone,so you've got to please yourself"

Thanks for the clarification. I don't have e brakes in my trucks...

_________________
If you think no one cares, try missing a couple of payments...



FIAA!

SFPP!

Thanks for the reply.
Do you know where is the switch for that?

_________________
Previously owned 2 Luvs) 75 & 77 Fleet-side
3rd 77 Step fixing up aka The Yellow Submarine to Luv Ms (Sun)Shine=)
98 GMC Gas Guzzler~>The reason 4 my ~>3rdLuvNext2a66MALIBU =)
66 Chevelle The Oldest of all the vehicles I owned

In researching my blower always being on hi and switching back and forth doesn’t control from lo to hi does nothing, I can’t find any other threads with pictures that help me. I do have a manual but that doesn’t help me either.

Any pictures of the exact wires that are connected from the blower to where they go? I can only see two wires coming from the blower motor, blue and black.

I have the blue and black wires are hooked up to other “like” blue and black wires from under the dash. I also see the brown wire under the ash tray you speak of and it does the same thing as the other blue wire I hooked it up to.

If someone could sell me a lo/med/hi lo switch, I’d appreciate it.

Any help would be appreciated.

But there is only one wire that plugs in the one behind the fuel gauge and i think that is for the temperature.
On my 1979 the one behind the fuel gauge is for the oil light. It's a yellow and white wire, should be able to test it by hooking up the cluster, removing the sensor clip from the oil sender & grounding it out.

Anybody knows what is the other for?
That's the one for the temperature, should be a black wire with a yellow stripe & you can test it the same way - remove the clip on from the sensor under the manifold and ground it & heat light should come on.

The brake light on the dash what is it for?Is it for the e-brake?Is there a switch somewhere?
Yep, for the e-brake. Not required for the truck to run, but nice to have. The switch is held down by a little metal tab on the ebrake handle down by the firewall, when the ebrake is pulled the switch closes. pic attached
EDIT: I should've rotated that pic 90 degrees clockwise before I uploaded it - the silver tab that is pointing down in the picture points toward the driver's side.

also you might want to download this wiring diagram if you don't have it, can be very helpful! https://scontent-lax3-2.xx.fbcdn.net/v/ ... e=65E480EA

Years later. Thank you for your detailed explanation on this, I was able to figure out my heater wiring and now it’s working perfectly.