1969 Plymouth temp gauge (Help wiring gurus)
#1474700
07/27/13 01:16 AM
07/27/13 01:16 AM
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Joined: Nov 2008
Posts: 178 New Berlin,Wi
Firepowerflyer
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Hey gang I'm working the bugs out of my almost completed resto on my 69 GTX.I have a temp gauge that does not seem to do anything. I had the whole cluster restored years ago by one of the bigger gauge companies but I don't remember who anymore. Anyway brand new M&H harness through out entire car. Everything else seems to be working great. I know there's a way to test sending unit with test light, not sure how. What's my next move replace sending unit? How do I go about checking the gauge? I hope I don't have to pull the cluster(pain in the butt)I did make sure the main connector was tight. Thanks Joe
Last edited by Firepowerflyer; 07/27/13 01:40 PM.
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Re: 1969 Plymouth temp gauge (Help wiring gurus)
[Re: Firepowerflyer]
#1474701
07/27/13 07:30 PM
07/27/13 07:30 PM
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Joined: Jan 2003
Posts: 10,666 North Dakota
6PakBee
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If you have the original instrument cluster voltage regulator installed, with the temperature sender wire connected, use a test light from ground to the sending unit terminal. The light should be flashing.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: 1969 Plymouth temp gauge (Help wiring gurus)
[Re: 6PakBee]
#1474702
07/31/13 05:30 PM
07/31/13 05:30 PM
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Joined: Nov 2008
Posts: 178 New Berlin,Wi
Firepowerflyer
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Quote:
If you have the original instrument cluster voltage regulator installed, with the temperature sender wire connected, use a test light from ground to the sending unit terminal. The light should be flashing.
Ok I did the following and I have no flashing light at the sending unit when the wire is hooked up.Do I have a dead gauge?How do I test the gauge or could it be a bad sender? Thanks in advance Joe
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Re: 1969 Plymouth temp gauge (Help wiring gurus)
[Re: screamindriver]
#1474708
07/31/13 10:20 PM
07/31/13 10:20 PM
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Joined: Nov 2008
Posts: 178 New Berlin,Wi
Firepowerflyer
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Quote:
Don't call it a bad gauge just yet...The blinking light means your voltage limiter is working and supplying current......Make sure you have a good connection between the bulkhead terminals for the sending unit wire... If that checks out then you can test the gauge and see if you have a range of motion... Disconnect the gauge from the cluster wiring and use 2 C or D batteries to get 3 volts...Then connect it to the gauge{pos to limiter post,neg to sender post}...If it's good it should come up to about half way or a little better with the sweep...
Ok do I need to pull the gauge out of the cluster? If so does the whole cluster have to come out of the dash to get the gauge out? It's been a couple of years since I put it together. Could I leave the gauge in place and disconnect the battery and put alligator clips on the gauge posts and hook it up to the D or C batteries like you explained? Thanks Joe
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Re: 1969 Plymouth temp gauge (Help wiring gurus)
[Re: Firepowerflyer]
#1474709
07/31/13 10:26 PM
07/31/13 10:26 PM
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Joined: Nov 2007
Posts: 21,808 Kirkland, Washington
Pacnorthcuda
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Quote:
Quote:
Don't call it a bad gauge just yet...The blinking light means your voltage limiter is working and supplying current......Make sure you have a good connection between the bulkhead terminals for the sending unit wire... If that checks out then you can test the gauge and see if you have a range of motion... Disconnect the gauge from the cluster wiring and use 2 C or D batteries to get 3 volts...Then connect it to the gauge{pos to limiter post,neg to sender post}...If it's good it should come up to about half way or a little better with the sweep...
Ok do I need to pull the gauge out of the cluster? If so does the whole cluster have to come out of the dash to get the gauge out? It's been a couple of years since I put it together. Thanks Joe
No! screaming is right. You just have to have access to the terminals. Juggling two 1.5 volt batteries can be a pain. Even ONE battery will cause the gauge to move if the gauge isn't dead.
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Re: 1969 Plymouth temp gauge (Help wiring gurus)
[Re: Firepowerflyer]
#1474713
08/01/13 02:34 PM
08/01/13 02:34 PM
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Joined: Jan 2003
Posts: 74,907 U.S.S.A.
JohnRR
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Quote:
Ok thats what I figured would need to be done.One last idea on this matter,does it matter which side the two wires on the back of the gauge go?? Could I have the wires switched on the gauge itself?? Thanks for the help Joe
yes it will matter .
Have you used your meter to confirm continunity between the sending unit end of the wire and the other end under the dash ? This wouldn't be the first time an M+H harness had a crossed wire.
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Re: 1969 Plymouth temp gauge (Help wiring gurus)
[Re: pushbutton]
#1474716
08/05/13 10:05 PM
08/05/13 10:05 PM
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Joined: Nov 2008
Posts: 178 New Berlin,Wi
Firepowerflyer
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Quote:
Setting in the drivers seat the right side stud should blink. If it's crossed under the dash it would be in the multi pin connector. The cluster I looked at was a 68 but I would think they would be the same.
I checked what side of my gauge is blinking and sitting in the driver seat the right side post is blinking. I have not check continuity all the way to the sender yet, I double checked all the connections. I looked at the schematic and the multi pin connector appears to wired correctly. I'm leaning towards a bad gauge unless I'm missing something.
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Re: 1969 Plymouth temp gauge (Help wiring gurus)
[Re: Firepowerflyer]
#1474717
08/05/13 10:21 PM
08/05/13 10:21 PM
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Joined: Nov 2008
Posts: 1,565 tennessee
pushbutton
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Quote:
Quote:
Setting in the drivers seat the right side stud should blink. If it's crossed under the dash it would be in the multi pin connector. The cluster I looked at was a 68 but I would think they would be the same.
I checked what side of my gauge is blinking and sitting in the driver seat the right side post is blinking. I have not check continuity all the way to the sender yet, I double checked all the connections. I looked at the schematic and the multi pin connector appears to wired correctly. I'm leaning towards a bad gauge unless I'm missing something.
Check to make sure the sending unit is getting a ground. Not too much thread sealing compound Teflon tape or paint in the threads.
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