I don't think you could ever get enough metal particles in the fluid to falsely activate the switch. More than likely, the rubber bladder at the top of your cap was out of position and pushing the float down. If the light goes out when the cap is off, then this is your problem.
Correct position
http://www.subaru-svx.net/photos/files/kuoh/6610.JPG
Incorrect position
http://www.subaru-svx.net/photos/files/kuoh/6609.JPG
KuoH
Quote:
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Originally Posted by b3lha
My light was on most of the time, even when the fluid was over the full mark. A complete change of fluid fixed it. I think when the fluid gets old it conducts the magnetism better (microscopic metal particles in it?) so the reed switch gets closed even though the float is at the top of it's travel.
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