02GF74
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| posted on 9/5/15 at 09:32 AM |
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jaeger temp gauge wiring.
Anyone wired up a jaeger temp gauge cause i cannot get needle to move (supposed to be new hence presumably is working)
Has 2 studs to the case but is that to be connected to 0v?
Three terminals
Green labelled 12v
Black
Brown.
Resistance as below
12V to black 740 ohm
12V to brown 140 ohm
Black to brown 600 ohm
So how tk wire this, 12 v seems to be obvious but the other two terminals?
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mark chandler
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| posted on 9/5/15 at 01:28 PM |
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I believe these gauges do not require a voltage regulator as one wire is the field winding, the other is to the sender so it's accurate even
with a failing battery as the needle compensates.
How you wire is a different matter, does it also need an earth to the casing.
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02GF74
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| posted on 9/5/15 at 06:52 PM |
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This is the gauge with connectors on the back.
No idea what car its from but a googke said something abiht there being magnets to hold the needle in place as it moves depending on the angle of the
gauge, ad per first photo.
I have connected 12 v to the green terminal and 0 v to body or the black terminal, connected 12 v to the other one, o v, shorted term 1 and 2 and
other combinations with no needle movemnt at all.
Some gauges have a bimetallic ekement to stop needle fluctuations so taje several seconds to respond, maybe i have not waited long enough but i doubt
that.
 
Description
 
Description
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mark chandler
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| posted on 10/5/15 at 05:26 AM |
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Bi metallic strips need voltage regulators, within 3 seconds that would have swung across to maximum temp straight off a battery, also the needle is
damped by the strip so it's not one of them.
So must be as I described, effectively a voltage meter, no magnets as the field is also powered hence why it swings the needle on different angles,
the needle when wired correctly will move instantly.
I have seen a few of these, an Alvis and series 1 Land Rover that had some extra gauges added.
It's not looking good if you cannot get any movement 
[Edited on 10/5/15 by mark chandler]
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