Int/ext digital temp / altimeter dash pod 12v (1 Viewer)

[Oldtoy74]

What are MUD's thoughts on me purchasing 12v int/ext digital temp/ altimeter dash pod, for a 24v bj74.
I have found the above from a 93 prado, although just wondering whether the sensors and digital display pod are dependant on 12v only or they can be fitted directly to 24v as well.
My initial thoughts would be probably not, but hoping it's not the case , any insight or ways I can use this dash pod, I've been looking for ages, and this is the first one found that I can get sensors and as well.

 

[dabasscow]

Should work fine with a 24-12 volt converter, looks like you have a fairly modern stereo is that 12v?

 

[Oldtoy74]

Should work fine with a 24-12 volt converter, looks like you have a fairly modern stereo is that 12v?

Yes I do have factory convertor, to run stereo, I've been looking epc and starting to think that the sensors that feed the display are within the general wiring harness, and associated switch & relays, etc, and I would not need to get any more sensors, if I plug in dash pod the feed should already feed back, obviously correcting the 12/24 issue prior to connecting? Any thoughts anyone??

 

[dabasscow]

Although the wires are there I doubt the sensores will be if the dash pod wasn;t fitted stabndard, I read there is fog light wiring in these but no fog lights or switch. I think you should be able to use the OE wiring provided you check no 24v supply from else were in the loom to the senders or pod.

I'm no electrical expert though.

 

[dabasscow]

I think you will need 12 volt senders

 

[sved]

The sensors are powered from the pod.So as long as you feed the pod with 12V you are OK.If the pod wasn't a standard item in your truck you will not find sensors in your existing wiring.Remember the temp sensors are just NTC's,so you only send a current through them which will be translated into a resistence value,which in turn shows up as a temp value in the display.

 

[sved]

You can see my writeup in this link https://forum.ih8mud.com/threads/hj61-in-out-temperature-gauge-repair.160108/#post-2240356
I added a overhead consol in my HJ60 24V.works fine.

 

[Oldtoy74]

Thanks sved, dabasscow,

I would assume if got some factory sensors either from 60 or 70 series, they would be able to just plug straight in to existing wiring harness, all I would need to do is find is the female / male couple sockets .....right...???
As I have plenty of empty of wiring sockets within harness, eg I don't have headlight washers but the harness has the socket to go, "........... looking on the epc, the int sensor locations for temp has about 3-4 different options to place on the bj 74 , only 1 location for the exterior ??
Sved , I may call on you again to guide me when I get the all the hardware together ,
Cheers

 

[sved]

I'm afraid your existing wiring harness has no wiring for temp. sensors.You have to make your own wiring,plus connectors to go with the sensors.
Just let me know if you need more help or information.
Outside temp sensors always behind the bumper/bullbar.
Inside temp sensors are placed whereever mr toyota thought it was right,but you can decide yourself where to put them.

 

[Oldtoy74]

I'm afraid your existing wiring harness has no wiring for temp. sensors.You have to make your own wiring,plus connectors to go with the sensors.
Just let me know if you need more help or information.
Outside temp sensors always behind the bumper/bullbar.
Inside temp sensors are placed whereever mr toyota thought it was right,but you can decide yourself where to put them.

I now have possession of the 12v display and sensors, as I'm a learner when dealing this project, I'm going ask sved to dumb it down for me and seek his guidance ,
Sved please tell me what I need to start my bench testing and where to start, I Have A 12 v battery , but will need some electrical ancillaries to move forward, just don't know exactly what?

 

[sved]

Hi Oldtoy,

First things first,

Did you get wiring and female conector to connect to the big male connector?? If not then you can start cutting the wires from the male connecter.The one that is connected to the pod that is.And start looking for a new male and female connector that can take the right amount of wires.The little connector can be used again,because you have both male and female sides.

Are there 6 wires??

Red +12V
black ground

green inside sensor ?
white/red inside sensor ?

blue outside sensor ?
yellow outside sensor ?

connect these to a luster terminal to get a sollid base for testing.
Can you open the pod to show me the pcb(printing-plate) and connection of these 6 wires?? Just to make sure about the sensor-connections.Also show me how the little connector has its wires connected on both sides of the connector.

Do you have a jap import BJ74 ? modelyear??

Greetings,

 

[Oldtoy74]

Hi Oldtoy,

First things first,

Did you get wiring and female conector to connect to the big male connector?? If not then you can start cutting the wires from the male connecter.The one that is connected to the pod that is.And start looking for a new male and female connector that can take the right amount of wires.The little connector can be used again,because you have both male and female sides.

Are there 6 wires??

Red +12V
black ground

green inside sensor ?
white/red inside sensor ?

blue outside sensor ?
yellow outside sensor ?

connect these to a luster terminal to get a sollid base for testing.
Can you open the pod to show me the pcb(printing-plate) and connection of these 6 wires?? Just to make sure about the sensor-connections.Also show me how the little connector has its wires connected on both sides of the connector.

Do you have a jap import BJ74 ? modelyear??

Greetings,

Thanks for the starting point, just to confirm I have & male female connectors on main wiring from pod, Oldtoy is a
87 JDM bj74, I will get a luster terminal and some testing leads and proceed to take apart and take some snaps of pcb,
Regards

 

[sved]

The Hj61 VX your're interested in,does that one have a altimeter thermometer ? If so keep this one a a spare if you're selling the BJ74.

 

[Oldtoy74]

It does have one, but apparently it's not working, that may require some surgery like you did, re soldering those junctions?

 

[Oldtoy74]

Ok, we are back on track with this int/ ext temp set up, as the Hj61 is great rig, but didn't do it me.


The wires colors that insert into board with ref as follows
Black = ground
Red = D+ ?
Blue /green stripe= L+ Attaches to small socket cream wire > light button & bulb
Green = in+
White /red stripe = in-
Yellow = out -
Blue = out+

From the pictures and wire colours does this make sense, ??
I'm getting luster terminal tomorrow with some test leads to start hooking up,
Any thoughts Sved??
Cheers

 

[Oldtoy74]

Well progress was made as I bench tested this arvo, and got things working, although the int thermo display reads incorrectly, so I hooked the ext to the int temp and it read correctly, indicating I have the correct wires from the pod itself .
The int thermo lead has a wire sheath wrapped around the length of the it, should this be earthed at both ends to correct??

 

[sved]

Hey,

The shealded sensorwire should only be connected to ground at one end only.
The blue/green stripe connects to your headlight wiring(it's a automatic dimmer function for the temp display when you activate your headlights.You do not have to connect these if you don't want this dimmerfunction.
You can test both sensors with a multimeter and check the resistance value.Should be almost the same vallue.

 

[Oldtoy74]

Value on the 2 are different , int= .620k ohms and ext 1.2k ohms, I will go and get a 1kohm ntc from jaycar and hook that one up.

Thanks for help SVed I've got my head around it all now, the fun begins to install,

 

[sved]

Great ,let us know if you got it working like it should.

 

[Oldtoy74]

Good progress with the 1k ntc purchased from tec shop, I tested and it's value was spot on with the factory ntc.
I have hooked up through the pod, and both are reading correct temps

I'm looking at cutting the ntc off the old triple wire that used in the factory int ntc, due to the earth sheath, and soldering new one to it, Any idea on the reason the sheath is used in the first place, does it help to curry the charge / signal over a longer wire length ??