Temp gauge wiring, easy question

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Temp gauge wiring, easy question

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Temp gauge wiring, easy question

Postby UDTDave » November 6th, 2017, 6:41 pm

Looking at the TM it shows the power wire at the top. Since gauges have wires left and right on the back of the gauge does that mean the power wire is on the left facing the gauge and the wire to the sensor is on the righ?
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Re: Temp gauge wiring, easy question

Postby rickf » November 6th, 2017, 6:57 pm

power goes to positive on gauge and negative on gauge goes to sender.
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Re: Temp gauge wiring, easy question

Postby UDTDave » November 6th, 2017, 7:18 pm

I kinda figured that. Which terminal is positive? I do not see any markings on the gauge unless I am missing something.
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Re: Temp gauge wiring, easy question

Postby rickf » November 6th, 2017, 8:10 pm

Pages 5-145 and 5-144 in the -20-1 manual available on here for download shows the position of the wires on the gauge. With "pictures and arrows describing the meaning of each one". :roll: :lol: Sorry, had an Arlo Guthrie flashback there.

Here is the link to the manual

g838_manuals/TM%209-2320-218-20-1-1%20may1982.pdf
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: Temp gauge wiring, easy question

Postby UDTDave » November 6th, 2017, 9:48 pm

Thanks! I actually have the manuals I just don’t know how to use them yet. I looked at the schematic and not 5-144 and 145. So the answer is, since circuit 33 goes to the sensor and that is on the left facing the gauge the power circuit is 27 on the right facing the gauge. Damn thing still does not work. Since this is a new gauge I guess it’s on to a new sensor. Thank goodness it only has one wire. Thanks for the newbie help.
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Re: Temp gauge wiring, easy question

Postby D Pizzoferrato » November 7th, 2017, 7:54 am

If you have original gauges, look at the Packard connector boots on the gauge for a clear clue. One connector is smooth, the other will have raised ridges around the outer circumference. These will mate to the Male Packard insert on the harness, which are similarly formed.
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Re: Temp gauge wiring, easy question

Postby rickf » November 7th, 2017, 9:57 am

UDTDave wrote:Thanks! I actually have the manuals I just don’t know how to use them yet. I looked at the schematic and not 5-144 and 145. So the answer is, since circuit 33 goes to the sensor and that is on the left facing the gauge the power circuit is 27 on the right facing the gauge. Damn thing still does not work. Since this is a new gauge I guess it’s on to a new sensor. Thank goodness it only has one wire. Thanks for the newbie help.

Are you checking this with the gauge panel out of the dash/ If it is an A2 do you have the ground wire hooked up to the gauge panel? If it is an A1 you will have to put a jumper wire from ground to the panel. The gauge panel has to be grounded. And looking at the back of the gauges the power (#27) goes to the left terminal but as Dave said match the boots.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: Temp gauge wiring, easy question

Postby UDTDave » November 10th, 2017, 10:03 pm

Thanks!
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Re: Temp gauge wiring, easy question

Postby kmam » November 11th, 2017, 5:42 am

I don’t think that grounding the panel makes any difference as the ground to the gauge is supplied by the sensor. The resistance between the sensor input and ground determines the voltage drop at the sensor and thus the amount of movement of the gauge. In the case of the temp gauge that resistance is determined by the temperature experienced by the sensor.

Grounding the panel is required for the panel lights.
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Re: Temp gauge wiring, easy question

Postby rickf » November 11th, 2017, 8:43 am

And for the volt meter but I have seen some weird stuff happen with open grounds so better safe than guessing.
1964 M151A1
1984 M1008
1967 M416
04/1952 M100
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone
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Re: Temp gauge wiring, easy question

Postby kmam » November 11th, 2017, 9:32 am

Fair enough.
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Re: Temp gauge wiring, easy question

Postby UDTDave » November 11th, 2017, 11:36 pm

Could Teflon tape on the sensor threads make a difference?
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Re: Temp gauge wiring, easy question

Postby kmam » November 12th, 2017, 12:03 am

I believe so. If there is enough tape to isolate the sensor body from the block and therefore prevent the earth return connection then the circuit is broken and will not work.
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