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mad-mk1
 Post subject: smiths temperature gauge
PostPosted: Wed Nov 06, 2013 4:20 pm 
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hey gurus,
i believe im in a pickle. well i think i am anyway.

i have an aftermarket loom (classicwiring looms) which adds a few extra things (immobilizer etc) and does away with a few things. leaving me with headlight relays and a blade fuse box etc.

i am running classic gauges all smiths, and im wondering about wiring up the temperature gauge.

how would i go about it?

the places i have read, tell me to take 10v from the voltage stabilizer to one pin on the gauge and the other too the sender. could i just take 12v from the fuse box, and i would likely need a resistor or something?


sorry for the dumb questions!

cheers jamie

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minijcar
PostPosted: Wed Nov 06, 2013 5:52 pm 
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No
The voltage from the regulator is regulated not dropped to provide a constant 10v to the gauge.
If you did it the other way the reading would fluctuate as the battery voltage fluctuated. :D

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Mick
PostPosted: Wed Nov 06, 2013 7:17 pm 
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Location: Under the bonnet son!
minijcar wrote:
No
The voltage from the regulator is regulated not dropped to provide a constant 10v to the gauge.
If you did it the other way the reading would fluctuate as the battery voltage fluctuated. :D


As well, you can't judge the amount of current the gauge consumes as it changes with temperature, so the resistor would be at best a guess, and not represent the correct reading across the range.

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minijcar
PostPosted: Wed Nov 06, 2013 7:52 pm 
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Ohms law

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mad-mk1
PostPosted: Wed Nov 06, 2013 7:56 pm 
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My issue is I don't use the voltage stabilizer, unless I have missed something when it was wired

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phillb
PostPosted: Wed Nov 06, 2013 11:08 pm 
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mad-mk1 wrote:
My issue is I don't use the voltage stabilizer, unless I have missed something when it was wired

Your standard fuel gauge should also be running off the voltage stabiliser. I would recommend an electronic stabiliser instead of the old original one too.

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mad-mk1
PostPosted: Thu Nov 07, 2013 7:59 am 
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Ok looks like I need to do some more research into this. Where would you start with an electronic one?

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drmini in aust
PostPosted: Thu Nov 07, 2013 8:40 am 
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mad-mk1 wrote:
Ok looks like I need to do some more research into this. Where would you start with an electronic one?

PM Wombat, he makes em cheap with 3 flying leads so you just hook up as per usual. I can't remember what the chip is..
Can either put it in the original can or just hide it in the wiring.

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S_Squirel
PostPosted: Thu Nov 07, 2013 8:48 am 
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L78 10 CV

L78 3 pin regulator
10V constant

http://www.ebay.com.au/itm/L78xx-Series ... 2ecb188cc0


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