1994 HZJ75 Electrical Issues (Where are the common grounds?) (1 Viewer)

[yohavos]

Vehicle is a 1994 HZJ75 Troopie. RHD, 12v.

I've been wrestling a variety of electrical issues that lead me to believe I have a grounding issue.

My right rear blinker isn't working. Using a multimeter (basically the extent of my electrical troubleshooting ability, btw) I read about 6 volts in the socket with the blinker on.

My right brake light does not work. With the headlights on, application of the brake results in the bulb going out. I tested the bulb on the other side, and know it to be good.

I traced the wires into the loom that runs the right side of the vehicle but haven't been able to find where the common ground is actually located. The closest I've found was a small bolt in the engine bay next to the air cleaner...is this all the way from the tail light?

Should I tear everything out of the interior and open up the loom, or just run new ground wires for each socket?

Any advice, especially regarding getting my hands on a Repair Manual and EWD would be greatly appreciated.

 

[yohavos]

Continued searching yielded some info here: https://forum.ih8mud.com/70-series-tech/557739-headlight-help-please-93-hzj75.html regarding the similarities between the HJ60 and the HZJ75 wiring, and I stumbled on this download: https://skydrive.live.com/?cid=4e7b45bad388da97&id=4E7B45BAD388DA97!337

It's the electrical section of a repair manual (Publication: 36262E) titled "Land Cruiser Heavy Duty" for production dates 10/84 - 1/90 which I'll be combing over. Unfortunately it's missing the "Body Electrical" section with the diagram of earth points.

It does describe the location of the ground points, which I'll be investigating tomorrow morning.

 

[roscoFJ73]

or just run new ground wires for each socket

Ive had experts look for the earth problems in mine and after fruitless searching they added more earths.
My 75 has had some panels repainted and I think this could be the problem

 

[Aussie 25]

The wiring.

The earth for the rear of the troopie is located under the rear to the LH side. Get under the back, follow the wiring to about a 250mm fom the left and you will find a bolt with the common earth. if you carnt fix it this way take the tail light out solder a wire on the earth wire and with a self tapper screw it in the body behind the light. It works

 

[yohavos]

Thanks for the info, gents.


Here's a quick follow up (this is more general electrical knowledge, but bear with me)


As I stated, I tested the sockets and got around 6v. During this test, I used the socket ground as well as a few different external grounds (bare metal on bumper, ground bolt on frame that my compressor runs off of) and still got 6v.


Could this exclude my ground cable as being a culprit, or is that irrelevant?

 

[yohavos]

Got a break in the weather and confirmed that my grounding issue actually lies in the socket itself for my blinker. I jerry rigged a wire that ran directly to the grounding point that makes contact with my blinker bulb from a bumper bolt and got some good blinker action.

I spliced good grounds into the existing cables for the sockets themselves and got nothing.

I'll be getting 2 new sockets soon and going from there.

 

[yohavos]

Closure:

I sourced a socket assembly from an 80 series in the local pick and pull. My original plan was to grab it to do a side by side comparison then order one from beno, but the one I found was in such good shape I threw it in and will be leaving it.

The clips are the same, with the only caveat being that there is an extra set of wires with a socket for the rear side light. The blinker socket fits a bit tight (had to tilt it a bit when installing it) but it works great.

All taillight issues have been resolved. Now on to figure out why the rear interior LED's are randomly turning on...

 

[1HaytchZed]

I lost my license plate lights, and the LHD blinker and tail light/brake light. FZJ75.

I still have some trouble shooting to do but this also sounds like a common ground/earth issue.

 

[duncanrm]

My right rear blinker isn't working. Using a multimeter (basically the extent of my electrical troubleshooting ability, btw) I read about 6 volts in the socket with the blinker on.

Put the multimeter away.

Your best friend when diagnosing problems like this is actually a Test Lamp (make sure it has an incandescent globe). If you dont have one, go and buy one or make one from a couple of lengths of wire and a bulb holder of some kind.