Posted by Fixerupper on February 14, 2011 at 11:01:38 from (207.199.205.40):
Been rewiring the dash for the old 1945 military vehicle I'm working on. Had to completely strip, clean and paint the dash and now it's going back together.
The gauges are electric. Didn't know there was such a thing in 1945. There are three temp gauges, engine, torque converter, and transmission. There are three pressure gauges,engine oil,torque converter and transmission oil.
I took three dashboards apart to get enough good stuff to put into one and so far I've been able to get everything together.
The wiring diagrams in the service manual are a little confusing where different pages will show the same wire number coded differenty. Wire#67 on one page will be #65 on another page.
The question I have so far is the pressure gauges. They are the usual two stud gauges, only there is a resistor going to one stud. The wire connects to the resistor which connects to the stud in the gauge. The stud on the resistor and the gauge stud it connects to are size #8 with 32 threads. The other gauge stud is size #10-32.
I have early model and late model gauges to work with, the early model in the top pic has an external resistor. The second gauge has the resistor built into the back of the clam shell that holds the gauge into the dash. I thought I'd show both so you can visually see the resistor on the older one.
The body of the gauge is grounded to frame, the wiring diagram shows the little universal grounding arrow where the gauge is mounted.
The question I have is how do these things work? With the gauge installed in the dash and the dash grounded to the neg terminal on a battery, (this is a negative ground system) the gauge pegs full pressure when I put power to the stud on the resistor with nothing connected to the other terminal yet. All three gauges do this. The temp gauges don't move. At rest the gauge reads zero.
Have any of you old timers worked with gauges like this? Should the gauges peg full on when hit with power. Does the stud with the resistor go to the sender instead? Clear as mud? Jim
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