Temperature Gauge?

[496BBC]

When the engine is warmed to 180 what is the ohms reading coming from the sending unit with the wire disconnected ?

If the ohms reading was 209 with the wire disconnected the sender is bad.

I have two senders, I'm going to put them in a pot and compare them both.

What should a good sender check out at?

Neal

 

[DWncchs]

When the engine is warmed to 180 what is the ohms reading coming from the sending unit with the wire disconnected ?

If the ohms reading was 209 with the wire disconnected the sender is bad.

I have two senders, I'm going to put them in a pot and compare them both.

What should a good sender check out at?

Neal

About 115 ohms for 180 degrees

Here are some readings from Willcox site.
220 degrees = 70 ohms
200 degrees = 90 ohms
160 degrees = 140 ohms
120 degrees = 250 ohms
100 degrees = 340 ohms

If you do the test in my #3 post that will also help to diagnose a stock gauge.

You can also go to Radio Shack and for $1 buy 2 resistors.
Put 1 between the sender wire and the block and the dash gauge should read 220 , put the second resistor in series with the first and the gauge should read 160.

 

[DeeVeeEight]

When the engine is warmed to 180 what is the ohms reading coming from the sending unit with the wire disconnected ?

If the ohms reading was 209 with the wire disconnected the sender is bad.

I have two senders, I'm going to put them in a pot and compare them both.

What should a good sender check out at?

Neal

About 115 ohms for 180 degrees

Here are some readings from Willcox site.
220 degrees = 70 ohms
200 degrees = 90 ohms
160 degrees = 140 ohms
120 degrees = 250 ohms
100 degrees = 340 ohms

If you do the test in my #3 post that will also help to diagnose a stock gauge.

You can also go to Radio Shack and for $1 buy 2 resistors.
Put 1 between the sender wire and the block and the dash gauge should read 220 , put the second resistor in series with the first and the gauge should read 160.

What values for the resistors please?

 

[496BBC]

When the engine is warmed to 180 what is the ohms reading coming from the sending unit with the wire disconnected ?

If the ohms reading was 209 with the wire disconnected the sender is bad.

I have two senders, I'm going to put them in a pot and compare them both.

What should a good sender check out at?

Neal

About 115 ohms for 180 degrees

Here are some readings from Willcox site.
220 degrees = 70 ohms
200 degrees = 90 ohms
160 degrees = 140 ohms
120 degrees = 250 ohms
100 degrees = 340 ohms

If you do the test in my #3 post that will also help to diagnose a stock gauge.

You can also go to Radio Shack and for $1 buy 2 resistors.
Put 1 between the sender wire and the block and the dash gauge should read 220 , put the second resistor in series with the first and the gauge should read 160.

Sorry DWncchs thought I had posted the results of that test after I completed it.

The gauge pegged once the wire was grounded and went full cold when disconnected as you suggested. This should mean the wiring and gauge is good, right.

Looking at the chart from Willcox, a 70 ohm resister should yeild 220* and a 140 ohm resister should yeild 160* right.

Thanks Neal

 

[496BBC]

got the sender on the stove right now and its dead on with the chart. 115 ohms at 180*.

Neal

 

[DWncchs]

When the engine is warmed to 180 what is the ohms reading coming from the sending unit with the wire disconnected ?

If the ohms reading was 209 with the wire disconnected the sender is bad.

I have two senders, I'm going to put them in a pot and compare them both.

What should a good sender check out at?

Neal

About 115 ohms for 180 degrees

Here are some readings from Willcox site.
220 degrees = 70 ohms
200 degrees = 90 ohms
160 degrees = 140 ohms
120 degrees = 250 ohms
100 degrees = 340 ohms

If you do the test in my #3 post that will also help to diagnose a stock gauge.

You can also go to Radio Shack and for $1 buy 2 resistors.
Put 1 between the sender wire and the block and the dash gauge should read 220 , put the second resistor in series with the first and the gauge should read 160.

Sorry DWncchs thought I had posted the results of that test after I completed it.

The gauge pegged once the wire was grounded and went full cold when disconnected as you suggested. This should mean the wiring and gauge is good, right.

Looking at the chart from Willcox, a 70 ohm resister should yeild 220* and a 140 ohm resister should yeild 160* right.

Thanks Neal

Yes as a general rule the gauge and wiring are responding correctly,but the ground and unground test doesn't check accuracy.
Sorry about leaving out the 70 ohms figure ( duh ). Yes your correct on the readings above.