Mystery wires

[apache]

Probably an easy one for you experts. My 84 K5/350 has what looks like a sending unit screwed into the block just above the oil filter,theres 3 wires off it,I know its not the pressure sending unit as thats next to the distributor. This also has a factory engine oil cooler and wondered if their for a thermostat system or engine kill system if it looses oil pressure???

 

[Kenny78]

What colors?

 

[toomany]

I've seen 'vette's and cadys with that sensor...was for the oil temp. But I'm guessing that's not gonna be the case here.

 

[AZ79K5Project]

The V6 had a three wire oil pressure switch with two blue wires and a pink/white wire. I was bored and looked it up. I have no idea myself.

http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528004c636

 

[Kenny78]

Two blues and a pinkish wire is the electric choke.

 

[apache]

I checked the diagrams from AZ`s link,Im trying to comprehend a choke wire off a pressure switch? Only thing I can think of is to save battery drain with the key on but engine off???
I`ll have to check the wire colors in the am and see if anything comes up in my manuals also. I was thinking as mentioned a pressure switch that prevents it firing up until oil pressure is established somewhat. This thing fires up in a millisecond after hitting the key though so that aint it. Damn gizmos

 

[Kenny78]

If it is the choke circuit, the switch prevents the choke from heating up and disengaging if you turn the key on, to say, listen to the radio.

 

[apache]

Radio.........what is this radio thing you speak of

 

[pauly383]

Radio.........what is this radio thing you speak of

Its on option on vehicles that are pavement bound

 

[DEMON44]

in my experience on the engines I work on, pressure switches are 3 wire, and temp are 2 wire. but often have circuits wired through the oil pressure switch. usually as a safety or backup of somesort.