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#1
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Sun Temp Gauge Technical Help
Looking for a bit of troubleshooting guidance on my Sun blueline temp gauge.
Took the car apart in fall for an engine freshening. Gauge worked good then (reasonably accurate) with what I felt was an original sending unit. Fast forward to this week. I get the car running, but the gauge is DOA. I have power going to the gauge, and the wire running from the gauge to the sender has continuity with no resistance of sort. In short, are the gauges that fickle? I noticed the engine builder coated the sender in teflon paste. The sender measures about 13 ohms from base to terminal at room temp (63 degrees). Thanks, Tim |
#2
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The sender may not be grounding with too much paste on the threads. With the engine warm, hold a screw driver against the body and touch the cylinder head, Have Tracy watch the gauge for movement.
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Mitch 1970 Chevelle SS 1966 Chevelle SS 1967 Camaro ss/rs 1938 Business coupe, street rod 2000 FXSTS, original owner, 13k miles |
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#3
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Quote:
Jason |
The Following User Says Thank You to SuperNovaSS For This Useful Post: | ||
napa68 (02-07-2023) |
#4
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There is power going into the gauge, but nothing coming out going to the sender. I checked for power going to the sender first of all (nothing) and then again at the output on the back of the gauge.
I then took it a step further to check for resistance in the wire going from the back of the gauge to the sender, and it's perfect. |
#5
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The wire going to the sensor is ground only. As the sensor heats up, it gradually opens the path to ground causing the gauge to display the current coolant temp.
Last edited by juliosz; 02-07-2023 at 09:45 PM. |
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69M22Z (02-07-2023), napa68 (02-07-2023), PeteLeathersac (02-08-2023), SuperNovaSS (02-08-2023), turbo69bird (02-09-2023) |
#6
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So is this correct?
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#7
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That sensor is the same as a fuel level gauge, it varies the ohms/volts allowed thru it for the gauge to read. The wire has to supply the power to do that. If the wire out of the gauge is dead, there is another issue. Hopefully, the wire didn't get grounded with ignition live during the engine bay cleaning and shorted the gauge out. Is there an in-line fuse that may have blown ??
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Mitch 1970 Chevelle SS 1966 Chevelle SS 1967 Camaro ss/rs 1938 Business coupe, street rod 2000 FXSTS, original owner, 13k miles |
#8
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There is not any power at the terminal coming out of the gauge. Something in the gauge is amiss. I'll pull it apart and investigate.
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#9
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Did you try grounding the sender wire to see if there was movement on the gauge needle?
Thanks, Jason |
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