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Old 04-12-2012
glindy's Avatar
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I am: g Lindy
Join Date: Mar 2012
Location: FLO,MO
Vehicle: 2002 Ford Ranger
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Cause of temp gauge flatline after change

Noticed a lot of people had dash temperature gauges fail after installing new sensor,Why?

Because the aftermarket sensors given will not work on a 1 wire 3.0 system,they will not ground it. Autozone for example gives you a SU284,it has no continuity fron the blades to the base,so it will not ground the 1 wire harness,as other aftermarkets also do.

Solution to fix gauge,
get a motorcraft SW-5174, F7DZ-10884-AA,it ground the blades and is the correct sensor for a 1 wire temp gauge.
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