Ian,
The voltage range of your gage is 0-12v. The voltage is ensured by the
voltage regulator. I believe on your car, it is on the back of the
speedometer. It is a little box about the size of your thumb, and has two
sets of Lucar blade-type connectors on it. Green feeds it fused battery
voltage, and it uses a variable gain off the speedometer body ground to
regulate the light green/green voltage to 12v.
Use a voltmeter and check to see that you have 12 volts coming out of the
voltage regulator. Measure from the female Lucar terminals on the voltage
regulator to a suitable ground.
If you have 12v there, reconnect your LG/G wire. Turn ON the ignition of
the car, and pull the green/blue wire off of the temp sender at the engine.
Have a lovely assistant touch this wire to a suitable ground, and see what
the gauge registers. If it's full hot, your gauge is functioning properly.
If it's not full hot, you may have a bad gauge, or even a few wire strands
broken in your green/blue wire (unlikely, but possible since the insulation
on this wire in particular is susceptible to heat embrittlement).
I'm not sure of the resistance range of the sender, but I would suspect
the sender if both the voltage regulator and the gauge check out OK.
I run a 20-lb cap on my Spit-6, trying to keep it as cool as possible.
I don't have a BL parts book in front of me, but I think I remember the
earlier TR-6's taking a lighter cap. You should have no problems however,
using a 14-lb cap on your car. I think that if your car does in fact run
this cool, you have everyone's envy here on the list.
I hope this helps,
Greg Meboe MEBOE@wsuvm1.csc.wsu.edu
Dept of Mechanical and Materials Engineering
Washington State University Pullman, Wash.
'67 Spit-6 (Daily) '74 TR-6 (In Progress)
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