Temp Gauge doesn't work - JeepForum.com
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post #1 of 3 Old 10-01-2013, 09:02 PM Thread Starter
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1977 CJ7 
Join Date: Aug 2013
Location: overland park
Posts: 41
Temp Gauge doesn't work

I just replaced the fuel and temp gauges, fuel sending unit and temp sensor and now everything works except the temp gauge. I followed John Shrenk's troubleshooting document but I still can't figure out the issue.

Testing results:

Temp gauge =
1. "A" to "S" = 21ohms
2. light flashes testing temp sending unit
3. grounding sending unit doesn't make my temp gauge rise at all

Fuel gauge =
S to ground= 17 not 68 to 72
S to I = 19 - 21
S to A = 19 - 21
I to A = 0
I to ground = 17 not 49 - 51
A to ground = 17 not 49 - 51

**i have a ground wire from the speedometer to the - on the battery

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post #2 of 3 Old 10-02-2013, 03:05 AM
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1981 CJ7 
Join Date: Jul 2009
Location: Bali
Posts: 5,836
HAve you tried grounding the terminal on the back that goes to the temp sending unit? Does it then move?

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post #3 of 3 Old 10-02-2013, 09:13 AM Thread Starter
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1977 CJ7 
Join Date: Aug 2013
Location: overland park
Posts: 41
Sorry, I wasn't using a ground wire, I was using my test light as my ground wire. Once I grounded the temp gauge, it started to move.

Resistance measurement Temperature Sensor
Question- When I take my ohmmeter and connect one lead to ground and the other lead to the post on the temp sensor, I'm not getting any reading. (I should be getting at least 200 to 400 ohms at room temp). Does this mean my new temp sensor is bad? Also, if I remove my temp sensor to perform more test, how do you keep the coolant from running out?
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