[Shotimes] RE: semi OT: how do senders work?

[Jim and Debbie Leyden]

A switching sending unit (as opposed to the gauge style) is merely a switch
to ground that opens when the pressure rises.  Or in the case of a
temperature sender, it closes when the temperature rises.  Most sensors
operate on that principle but beware that there are some that have two wires
where one wire is the power to the sender and the other is the switched
power from the sender.  You have to know what you are looking for and what
vehicle used that type in order to get the right part.  There were, in the
past, two wire sensors that would show you both a low and a high (like a
yellow light when the engine was cold and a red light when it was too hot).
But I haven't seen those in common usage for years.
The gauge style is a variable resistor, usually to ground.

Jim



-----Original Message-----
From: Justin Schick [mailto:jschick@aafp.org] 
Sent: Monday, May 10, 2004 5:15 PM
To: shotimes@autox.team.net; TechSHO@topica.com
Subject: semi OT: how do senders work?


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Hi all,

I'm hoping some of the more knowledgeable listers will be able to answer a
question for me. It has to do with my Mustang project, but could easily
apply to the SHO:

How do one-wire pressure or temp senders work?

I was wiring up the relay (Painless) for my fuel pump on the Mustang, and
remember reading / hearing that the best way is to run the wire for the
switched power source to the sender for the oil pressure gauge. This way,
the fuel pump only switches on when there is oil pressure, which is a better
scenario than having it constantly running as soon as the key is turned past
off. I wired it up like this and then began to wonder if it'd actually work.
Is the sender sending voltage to the gauge (meaning, it'd work for my fuel
pump relay), or is it grounding itself (meaning I'd need another signal
source for my relay)? Inquiring minds want to know! Thanks in advance,

Justin
silver 92 SHO in KC MO, along with a couple other Fords

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