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EH Coolant Sensor for dash light

What to do next? Was sold a Fuelmiser CTS123 as being correct for EH179, didn't work, turns out meant for guage. Downloaded catalogue to check and bought a Fuelmiser CTS124 meant for dash light. Wouldn't screw all the way in (below thermostat) but didn't leak, didn't work anyway because light not coming on when turn the key (checked light by earthing and it does work). Called Fuelmiser today and was told info correct but catalogue now obsolete and only oil sender being sold now for EH 2.9litre. Both senders still being made however no longer listed as suitable? Rep did apologise for inconvenience and said will need to contact sellers for refund. So now what, no refund on either as have been used and still don't have a working temp light. Thoughts anyone? Cheers Archie.

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Comments

The sender's resistance likely lowers as the temperature increases ( they usually do).

A simple transistor circuit can turn the light on when the sender's resistance gets low enough.

You could take the sender to Jaycar and see what they recommend.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

the temp light doesn't come on when you turn the ignition to the "on" position
i've never had an early holden that does
if your light comes on when you ground the wire the circuits working correctly
why do you think it should come on when the ignitions in the "on" postion ??

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the lights were/are useless, they comeon when its too late IMO - get a gauge in it so you dont cook the new engine

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the temp switches are specified to close at 125 degrees Celcius...which is at the top end of a regular gauge...so not a lot of room for error...when the light comes on (and hopefully it's working) you have to take immediate action...

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Andrew

the sensor is just a basic switch that activates when temp exceeds a certain value. if the light does work when grounded then the system should work fine - but only when temp exceeds value. I believe the EH onwards did include a temp test when ignition was switched to start...this is clearly explained in the original owners manuals but those contacts often fail...so unlike the oil and charge lights that light up when on..the temp light should only come on when start...but it often doesnt work...if you have a new switch, the lamp is tested and it doesnt leak the system should be fine...btw I have a HR and had a HX that only have/had the temp warning lamp and they have actually worked and done the right thing...agree that a gauge gives you more confidence though because you can see in advance if the engine coolant is higher than normal..interestingly many modern basic spec cars inc popular Mazda CX5 no longer have gauges and gone back to the warning light only..because many drivers don't bother looking at gauges...I know this from having young adult daughters - frustrating but true...

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Andrew

the ignition switch is what brings the lamp test on when the key is in the start position doctor terry has told us before how hot wiring early holdens kills this part of the switch.

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go on yank run out on us

i;ve owned a lot of early holdens in 40 years never has the temp light come on when the ignition is turned to the "on" position
DR terry has been known to be wrong at times in his information
i.ve owned FJ FC EK EJ EH HD HR HK HQ holdens and not a single one has done this if it were right at least one of these cars would have !!!!

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Interesting...the wiring diagrams indicate the circuit (EH onwards) and the owner's manual (as shown for a HR) go into detail to describe it....my doesn't work..maybe someone can actually confirm theirs does as it was supposedly designed...Holden does state "normally"...ps don't get On and Start confused..

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Andrew

I recall Dr Terry's post saying the temp light came on in the ON position with EH.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

with a normally open temp switch (and without any solid state devices or similar) that would have the lamp on all the time...the lamp test has to temporarily earth...so the start position only provides that opportunity..still would like to hear from someone to confirm the temp light does come on at Start...as another poster has commented - I either haven't noticed it (can't remember) or it hasn't worked on a car that I've owned, HR, HT and HX with just a temp light...but they have all worked when overheated...

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Andrew

"still would like to hear from someone to confirm the temp light does come on at Start."

It is half illuminated.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

There appears to be a misunderstanding.

What I said was that for Holdens from EH to HZ (without a temperature gauge), the temp light light comes on when the ignition switch is turned to the CRANK position. Not the ON position.

This was done as a simple method to test the globe. So each time you start the engine the temp light should flash for a moment.

If you check out the wiring in one of these models (either a diagram or an actual car) you will see a green wire running from the temp light to the switch on the motor going via the ignition switch connecting to the GRD terminal. This grounds the green wire when cranking, in much the same way as grounding the temp switch terminal itself to the chassis tests the globe.

In X2 & GTSs etc. with a temp gauge this GRD terminal is removed from the ignition switch terminal housing, insulated & taped back to the harness.

If at any time the ignition is 'hot-wired' the GRD terminal in the ignition switch will be burnt & this 'globe test feature' will no longer work. Very common.

Dr Terry

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My experience with the Temp Switch is that they were one shot devices (at least with grey motors).

Once they were activated they went out of tolerance and could not be relied on again.

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T

My Shed

Holdenpaedia, they're the brakes Mate.

even as per your description dr terry i've never seen that happen when starting the car
the only times i've seen the light work is either when grounded or over heating occurs

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Across my grey motor experience, I've never seen it either.

My mistake, halfway between ON and CRANK position for my HQ, LJ and HZ experience.

Info here ...

http://holdenpaedia....

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T

My Shed

Holdenpaedia, they're the brakes Mate.

Just checked on bog-stock EH. Gen and Oil lights illuminate when in 'On' position. Temp light illuminates when cranking. All go out when engine starts.

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