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Discussion Starter #1
Anyone know what color the resistor on the back of a 70 SS Temperature gauge is? I have a yellow one on it now but for some reason I thought the temp gauge used a green one. Also, does anyone know what the ohm's reading would be on one of these when I test it.

Jody

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70 Chevelle SS
454/400T.H.
Black/White Stripes
My 1970 SS

[This message has been edited by Jody1970 (edited 04-16-2001).]
 

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Jody, I only have one SS dash in front of me. Its for the LS-6 and its orange. Unfortunately I don't have a digital ohm meter but my meter reads approx 1.2 ohms. I will try to get a look at the LS-5 and L-34 dashes to see what color they are. I honestly never paid any attention until now. I too thought I had seen green??? Anyone else?

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"Details Make the Difference"
 

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Jody,

I'll try to help...

First off, guys, can you help me out? I didn't think there was any difference between temp senders on Big block cars equiped with the optional guages? Correct?

Different colors would indicate to me, a different resistance value, BUT, it really shouldn't have a different value if the guages are all the same along with the temp sending units. I don't have a guage in front of me, but I would assume it would need (3) inputs. A +12 volt terminal, a ground terminal, and the input terminal that leads to the sender on the block. If I'm wrong, someone please correct me.

Elree Colby ARE YOU OUT THERE?

[This message has been edited by Coppertop (edited 04-16-2001).]
 

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Yes Coppertop, the same temperature transducer is used on big block or small block cars. As stated by Rick it is an orange resistor. The resistance value is 86 ohms.
 

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Discussion Starter #5
I took an ohm's reading on the temp gauge ceramic resistor (removed from the gauge) and it read 91.3 Is it bad?

I have two other ones that read 83.3 and 85.1 that I could use in its place.

Another question: I took a reading across the vertical post's of the gauge itself and this was an open circuit. These are the post's that the Ceramic resistor attach's to. Is this correct or should I have got resistance on this reading? My gauge does not work and I am trying to narrow it down to the defective part. My gauge reads in the 4 o'clock position all the time. If I apply power it always goes to the 4 o'clock position no matter where I position the needle before I apply power.

Coppertop: The gauge only has two wires that attach to it via the PCB and attach to the horizontal posts of the gauge, 12volts and the ground that comes from the Temp sensor. The ceramic resistor attach's to the vertical post's of the gauge.

Thanks for the replies!

Jody

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70 Chevelle SS
454/400T.H.
Black/White Stripes
My 1970 SS
 

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Jody

The top and bottom terminals are not internally connected. I believe your problem is caused by the bottom post not making contact with ground. I have a temp gauge that has a 91-ohm wire wound resistor so I think the 91-ohm resistor will work. For accuracy you should have it calibrated. However it should be close.
 

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Discussion Starter #7
Thank you, I will give that a try.
Jody

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70 Chevelle SS
454/400T.H.
Black/White Stripes
My 1970 SS
 

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Discussion Starter #8
Well I finally have a temperature gauge again.
Elree: You were correct. The problem was with the lower vertical terminal not being grounded. I ended up just running a jumper from the bottom post to a ground and temp gauge started working.
Coppertop: You were correct in your statement also that the gauge has 12V, Sender Wire, and a very important Ground.
Thanks for the help guys. Jody

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70 Chevelle SS
454/400T.H.
Black/White Stripes
My 1970 SS
 
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