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Oil pressure sending unit question
#2091858
06/14/16 04:09 PM
06/14/16 04:09 PM
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Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
OP
master
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OP
master
Joined: Mar 2003
Posts: 4,848
Memphis
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My 82 D250 has 2 oil pressure sending units in the back of the motor, one is the standard sender for the gauge....The 2nd one is the one I have questions about....It has 3 prongs and I wonder what it does? I cant find it in any wiring diagrams. I'm wondering if it has any relation to the fact that it wont run in the run position since the engine swap...It only is getting fire while cranking....I know this is a classic ballast resistor problem.
Thanks
Rick
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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Re: Oil pressure sending unit question
[Re: HemiRick]
#2092071
06/14/16 10:21 PM
06/14/16 10:21 PM
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Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
71yelladustr
super stock
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super stock
Joined: Dec 2010
Posts: 1,035
Missouri U.S.A.
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The 3 prong switch is for controlling 12v power to the heated carb choke thermostat. May also control an oil light if equipped. The 2 terminals across from each other should have continuity when there is oil pressure. These will go to the choke thermostat. The other terminal will ground without oil pressure present. This will go to an oil light. The bell shaped one wire sender controls the gauge. 
Last edited by 71yelladustr; 06/14/16 10:30 PM.
392 gen III hemi on E-85 727 trans Dana 60
10.02@134
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