Temperature gauge

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Temperature gauge

Post #1 by Scooby » Tue Aug 23, 2016 9:34 am

1992 3CX project 8. My temperature gauge has stopped working. Can some kind person tell me how to check if it's the sender, the gauge itself, or something inbetween please ? I know it's elementary electrics but me and electrics don't get on too well.

TIA.
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agrimax
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Re: Temperature gauge

Post #2 by agrimax » Tue Aug 23, 2016 6:38 pm

Normally,take the wire off the sender and earth it out.With the key turned,the gauge should go up fully. If it does,the sender is likely to be faulty and if not either the gauge or perhaps some printed circuitry in between could be the problem!


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Re: Temperature gauge

Post #3 by Scooby » Tue Aug 23, 2016 8:21 pm

Thanks for that. I'll investigate further. I should know all about circuits and things but my mind goes blank for some strange reason.
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Re: Temperature gauge

Post #4 by jcb4cx » Tue Aug 23, 2016 8:48 pm

has it got two senders one for the light and the other for the gauge ?
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Re: Temperature gauge

Post #5 by FOWLER MAN » Tue Aug 23, 2016 9:33 pm

agrimax wrote:Normally,take the wire off the sender and earth it out.With the key turned,the gauge should go up fully. If it does,the sender is likely to be faulty and if not either the gauge or perhaps some printed circuitry in between could be the problem!


Hi,
As agrimax says. :thumbup:
If you want to check the sender itself it's easy with a multi meter.
Just set the meter to Ohms to check the resistance in the sender unit. Pull the lead off the sender and tape up for safety.
Connect the meter Pos. to the sender connector terminal and the Neg. to earth or the sender body.
With a cold engine you will have a reading well in excess of 450 Ohms and about 100 Ohms or less at normal running temperature.
That figure will quickly drop off into the 20s if the engine overheats.
These figures are only a guide, but close enough to eliminate a sender problem.

Good luck.
Fred


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Re: Temperature gauge

Post #6 by Scooby » Wed Aug 24, 2016 10:00 am

jcb4cx wrote:has it got two senders one for the light and the other for the gauge ?
Oh dear, I've owned and worked with JCBs since 1968 and thought I knew a bit about them but have to confess to not knowing if mine has got a temp. light. It's the front dash Project 8. I must try harder on this. Thanks for everybody's help.
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Re: Temperature gauge

Post #7 by Scooby » Wed Aug 24, 2016 10:02 am

FOWLER MAN wrote: Hi,
As agrimax says. :thumbup:
If you want to check the sender itself it's easy with a multi meter.
Just set the meter to Ohms to check the resistance in the sender unit. Pull the lead off the sender and tape up for safety.
Connect the meter Pos. to the sender connector terminal and the Neg. to earth or the sender body.
With a cold engine you will have a reading well in excess of 450 Ohms and about 100 Ohms or less at normal running temperature.
That figure will quickly drop off into the 20s if the engine overheats.
These figures are only a guide, but close enough to eliminate a sender problem.

Good luck.
Fred
Thanks for that Fred. I have a couple of those "meter" thingies but I just get baffled with them. But your instructions are pretty clear. And what is also very clear to me is that I must try harder. :oops: Thanks for all the help I've had.
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Re: Temperature gauge

Post #8 by Scooby » Wed Sep 28, 2016 5:23 pm

I have finally got back to this job. Today I took the cable off the water temperature sender and made up a cable to attach to the one terminal inside the connector, switched the ignition on, and then touched earth with the other end of my made-up cable. The temp guauge shot up to maximum. Does this indicate that my sender is at fault ?

I have also got what looks like some sort of temperature warning transmitter thingy which is on the top of the cylinder head quite close to the sender for the tem. guauge. Is this a warning light sender ?

Thanks for all help and for being patient with me :oops:
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Re: Temperature gauge

Post #9 by jcb4cx » Wed Sep 28, 2016 5:33 pm

Scooby wrote:I have finally got back to this job. Today I took the cable off the water temperature sender and made up a cable to attach to the one terminal inside the connector, switched the ignition on, and then touched earth with the other end of my made-up cable. The temp guauge shot up to maximum. Does this indicate that my sender is at fault ?

I have also got what looks like some sort of temperature warning transmitter thingy which is on the top of the cylinder head quite close to the sender for the tem. guauge. Is this a warning light sender ?

Thanks for all help and for being patient with me :oops:



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Re: Temperature gauge

Post #10 by agrimax » Thu Sep 29, 2016 12:34 am

Looks like your gauge sender is faulty.
Try the same thing with the wire on the other sender. If you earth it,I think the warning light should come on.(And /or perhaps a buzzer should sound?)


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