Headlight Wire Red/blue stripe...where's it suppose to go (1 Viewer)

[swamprunner]

Working on a new to me hj60...Canada spec. Trying to uncobble the previous owners jerry rigged wiring

Spent quite awhile trouble shooting why the headlights didn't work. I've thoroughly educated myself on the headlight system via the search button.

Finally think I found the culprit.

There is a cut red wire with blue stripe, look like 12 gauge to me, located on the left fender near the headlight. (See attached pics)

Where is this wire suppose to go...I found the one end is in the pigtail of the 12v dimmer relay. Where is the other end suppose to attach to.

I'm assuming it need to be attached to either a 12v or 24v power source. I ran it to a 24v power source and bamn. The dimmer relay clicked and whatta ya knowI now have headlights.

I just don't want to burn something up running it to 24v if its only suppose to have 12V

 

[VTCDN]

Under search you can find manuals .

Wiring diagrams have alot to be desired , but there a very basic truck.


One nice size wiring Dia , would be Nice, I find them small and almost impossible to read.

Now as for 12 / 24 . I'm almost 100% on it being all 24 . Thats why I made sure i went straight 12v , so i didn't need to have electrical converters etc.
My solar is 36 OV to a MPPT 12 volt , and thats enough .
VT.

 

[swamprunner]

I have the chassis manual but I can't make sense of the wiring schematic. Is has two different diagrams for the headlight...they both are for hj60's but neither one makes sense to me.

Just looking for someone with Canadian spec hj60 to pop the hood, have a look and chime in here....

 

[Greg_B]

I don't have an HJ60 to check, however iirc and the evil center tap system uses the same principle as the one on the BJ42...there should only be two power wires coming into the dimmer relay. One from the center tap for 12V, and one from the 24V side of the harness for the 24V source.. Means some wire tracing as I can't check colours for you, but hth's.

With that wire disconnected, and the headlight switch off, what do the headlight pins read? Then on the off position what to the headlight pins read? Any 24V showing at all? Then when you hook up that wire to 24V, what are the pin readings on all three connections left and right side in the off and then on position.

gb

 

[swamprunner]

greg,

I trouble shot all you suggestion before posting this

with the wire unhooked...there is zero volts to any of the head light pins or fuses. Doesn't matter if the headlight switch is on or off.

I then connected it to 24v and there is 12.xx to the hi and low pin on either side depending on whether the high or low beams are selected.

Some have suggested that this wire needs to go to 12v....so I stuck it in the positive terminal on the driver side battery and the lights work when the wire is there also...and there is also 12.xx volts at all the headlight pins.

For what its worth the fsm say this wire R/L is suppose to go to the Driver side high headlight fuse. It clearly doesn't b/c there is continuity between one of the pins in the dimmer relay pigtail.

I guess I should just go with the 12v source b/c that won't fry anything...

 

[Greg_B]

Read through this again, ignore the wire colors but see if the readings at the pins are the same. You need 24V showing at the appropriate pins, so the battery draw is balanced.

+++++++++++++++++++++++++++

24V 1984BJ42...Stock headlights.

Evil center tap supplies 12V to the headlight dimmer relay. The headlight dimmer relay is a 12V relay. It also has a hot 24V lead that comes into the relay (this is the beginning of the equal draw system). Power is split to whatever headlight wire needs 12V or 24V, depending on the headlight on/off switch, and high/low beam toggle.

Headlights off should show no voltage to any of the LH side harness female pins, and 12V to Red/B and 12V to the Red/Y headlight harness female pins on the RS. Red/B is the nuetral pin, and the other pin showing voltage is the highbeam pin, so they cancel each other out.

Headlights on lowbeam should show 12V to the lowbeam pin on the LS. The RS should show now show 24V to the low beam pin and 12V to the neutral pin.

Headlights on high beam should show 12V to the highbeam pin on the LS. The RS should now show 24V to the highbeam pin and continue to show 12V on the neutral pin.

So, a constant 12V supply is given to the neutral pin on the right side headlight (from the tap on the negative pole on the highside battery), and the high/low poles run 24V, feeding off the highside battery positive pole, through the headlight dimmer relay. This same tap supplies 12V to the dimmer switch, which routes 12V's to the high/low on the drivers side headlight, with 0V neutral. Hence, both batteries have equal draw.

The 12V's available to neutral pin and the 12V available to the high beam pin on the right side headlight side cancel each other out when the headlights are off.

++++++++++++++++++++++++++++++++

hth's

gb

 

[swamprunner]

That really is evil...i will go double check and see what i have going on

 

[swamprunner]

just tested it out following your instructions. Everything check out like you said except I don't have 12v at any of the pins when the lights are off.

I got 24v on the right side when I tested so I guess that means its working.

This is with the wire in the picture jumped to 12v (the ls battery + post.)

You sure there is suppose to be voltage with the lights shut off?

 

[Greg_B]

On a 1981 Cdn Spec BJ42 and a 1984 Cdn spec BJ42...yes.

Need someone with a Cdn spec unmolested HJ60 and a multi-meter to check in here.

And you're saying that with headlights on...you are getting 12V to the neutral pin of the headlight which shows 24V on the high and low pins, and 0V to the neutral pin of the headlight which shows 12V to the high and low pins?

gb

 

[swamprunner]

yes just like you're saying. the only difference is that I have no voltage to any pins when the lights are switched off. Which to me makes sense.

This is all with the wire in the picture jumped to the positive terminal on the LH low side battery.