1974 FJ40 Water Temperature Sending Unit (1 Viewer)

[KWA]

Temperature sending unit not working.

- Brand new OEM sending unit from Toyota dealership.
- Removed and Cleaned Adapter fitting. It was a little rusted. Wire brushed and cleaned.
- Put dialectic grease on Temp. sensor plug to maximize connection.
- Grounded Temp. wire with test light. Light flashed and gauge moves from Cold to first hash mark when grounded.
- When I start it up Gauge does not move and stays cold.

Anything else I'm missing?

 

[pithicus]

All I can think of is it's not earthing where it's screwed in due to grease/thread tape or the like.
Dielectric grease does not conduct electricity. So clean that off the spade connector/ plug if it's on it.

 

[Steamer]

"Ox-Gard" works good for electrical connections.

 

[KWA]

Mahalo for the replies. It works!

I let it run for about 30 minutes and the gauged moved above the first hash mark.

It is not street legal so I don't get to drive it in my area too much. I don't think I let it run long enough the first time I cleaned everything.

Thank you again.

 

[ToyotaMatt]

Temperature sending unit not working.

- Brand new OEM sending unit from Toyota dealership.
- Removed and Cleaned Adapter fitting. It was a little rusted. Wire brushed and cleaned.
- Put dialectic grease on Temp. sensor plug to maximize connection.
- Grounded Temp. wire with test light. Light flashed and gauge moves from Cold to first hash mark when grounded.
- When I start it up Gauge does not move and stays cold.

Anything else I'm missing?

I have these :

I Reproduced the TALL size spec. early 90404-16127 in CHROME , it conducts electricity very well

SOLID BRASS TOYOTA Cylinder Head Coolant Temperature Sensor UNION Nut 90404-16127 , Fits 1956-12/74 F Engines FJ40 , FJ55 , FJ45, - VintageTEqParts.com

SOLID Brass Alloy TOYOTA F Engine Cylinder Head Coolant Temperature Sender UNION - 90404-16127 - Fits ALL F Engines ...

vintageteqparts.com

 

[KWA]

I have the smaller temp sensor. Thank you