oil temp combo gauge bench testing, what am I doing wrong (question answered) next: calibrate the gauge |
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oil temp combo gauge bench testing, what am I doing wrong (question answered) next: calibrate the gauge |
malcolm2 |
Oct 14 2014, 09:00 PM
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#1
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
I have had this gauge for a while. I also found the complete taco plate, sender etc... to set it up. I decided to test it. I tested the sender a while back in hot water and remember getting various readings as the temp increased.
I pulled out my 12v powered drill battery, put 12v + on the + terminal of the gauge and the - on the - of the gauge. ( you can't see the - wire in the picture, but it is there) The gauge moved to where it is in the picture without the sender even being connected. It did not move once the sender was connected. Inside the temp gauge are the following #s. Far left 30, at the start of the red line 156.7 and the end of the red line 170 *C The top of the paper is what is stamped on each face of the hex and the gauge part # has been edited to what you see in the picture. 1. why is the gauge moving at room temp with or with out the sender? 2. do I have this thing hooked up right? any alternate testing suggestions? 3. do I have a matched sender & gauge? |
timothy_nd28 |
Oct 15 2014, 06:43 PM
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#2
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Advanced Member Group: Members Posts: 2,299 Joined: 25-September 07 From: IN Member No.: 8,154 Region Association: Upper MidWest |
I'm not sure where the needle should point at 212 degree's F. I think it's too close to the red mark for such a low temp. If you buy a 1k potentiometer from your local radio shack, you could wire it in series with the sender. Perform the test again, and adjust the pot till the needle is somewhere in the middle. Then if you carefully remove the pot from the circuit and measure the resistance, you could buy a fixed resistor with that value and hard wire it in the circuit.
Just a thought |
malcolm2 |
Oct 20 2014, 09:15 PM
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#3
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Advanced Member Group: Members Posts: 2,745 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States |
I'm not sure where the needle should point at 212 degree's F. I think it's too close to the red mark for such a low temp. If you buy a 1k potentiometer from your local radio shack, you could wire it in series with the sender. Perform the test again, and adjust the pot till the needle is somewhere in the middle. Then if you carefully remove the pot from the circuit and measure the resistance, you could buy a fixed resistor with that value and hard wire it in the circuit. Just a thought Hey Tim, I am back at it......I bought the 1k potentiometer and I get zero needle movement. I ran the pot screw thru all 15 turns and measured ohms from 0 to 1.5 on the continuity scale. 3 terminals on the pot. I put the wire from the sender to, let's say, the right term on the pot, then from the middle terminal on the pot to the gauge. The gauge was all powered up like above and the gauge needle was nearly 1/2 way. Do I need more resistance, a 20K or 100k pot? I wonder if Bruce is correct about a short in the gauge giving me more resistance at room temp. I did not see anything touching the "G" when I opened it up. Clark |
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