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Ohms and Temperature guage.

Ok, the 101 had a capliary guage on it origional which was defunct when I got him. I had for some reason a spare IIa speedo which had a electronic temp guage on which I placed on the 101's speedo in place of the capliary one.

I fitted a standard Rangie V8 temp sendor circ 1980's but this overread on the guage. I tested the temp on the top hose on a run with a maplin digital temp sensor and before I cooked it I found the running temp to be ok at 86 degrees.

To bring the temp guage into line I bought a shot in the dark variable resistor from maplins and linked it in , tweaked until the guage reads normal an tickover after a run etc.

I measured the resistance of the pot hoping to just install a resistor in line to prevent the pot getting accidentally adjusted etc etc. It reads at

0.35 ohms.... whats that then? Any profs out there care to let me know the coloring of the resistor I need please.

Also though this worthy of sharing for any one else with a V8 or other engine fitted to a series / 101 vehicle.

Lee D

Reply to
Lee_D
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Do not worry about the color codes on this resistor. You'll find the codes somewhere by Googling if you really want to know. Just go to your local electronics store and ask for a 0.35 ohms resistor. Which b.t.w. is almost nothing. Hardly any resistance so not sure this will be your solution really. Kind regards, Erik-Jan.

Reply to
Erik-Jan Geniets

Agreed, unless you are very careful about terminations you'll have more resistance from them than the resistor. Are you sure the meter wasn't reading 0.35 k ohms?

Reply to
Dave Liquorice

Hi Lee, try putting it in paralell i.e. from the output terminal to earth, you'll get a different reading but doing the same job, hopefully with a easier resistor to source. BTW .35 Ohm = 350 Meg Ohm HTH.

Roy.

Reply to
LR90

BTW .35 Ohm = 350 Meg Ohm

Are we sure? Rubbish! They're different by a factor of 100,000,000.

Just as 0.35 ohm is negligible (i.e. as good as a short circuit) as previously pointed out, 350 Meg Ohm is as good as an open circuit.

You'll get 0.33 ohm wirewound resistors fairly readily (e.g. at Maplin) but they don't tend (from memory) to be colour coded.

As Erik-Jan points out, this might not be your solution but it'll be cheap to try!

Reply to
Dougal

Are you confusing Megohms MO (just read the O as omega!) with milliohms mO. Both being rather out of scale for what one might expect?

Alistair

Reply to
Alistair Bell

Too right, he means 350 milliOhm.

There are plenty of applications, though not too many in a 101 Landy, where you would use 350 milli-ohms as current sensing shunts. 1A though

350 milliOhm is 350mV, and a quite easy signal to measure.

What kind of current is he likely to pass ? only milliamps surely ?

Steve

Reply to
Steve Taylor

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