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Low Pressure sender help

DAVENET

DAVENET

Bronze Member
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Background:

1969 442 w/ a 265ci flathead Chrysler.

I'm looking for insight on the low oil pressure sender. I am in the process of repowering the systems after a full wiring strip down. Battery was finally installed last night to start testing loops to make sure I didn't screw something up while taking notes. With the battery hooked up (and no key on) the low oil press. lamp is on. I put it back exactly how I found it, but that really means nothing if you have seen pics of what was there. And the bulb was burned out.

I am assuming it is a normally open switch. Wiring was from a pos(+) on the fuel gauge, running thru the lamp and back to the single post on the switch. I am also assuming it is stuck in the closed position after sitting so long, hence the completed circuit.

Questions for the experts:

N.O. or N.C.?
What pressure?
Maybe a reach, but part number?

Or am I overthinking all of this and its's as simple as getting a replacement from Rockauto for a '55 Chrysler Windsor that used the engine . . . https://www.rockauto.com/en/moreinfo.php?pk=11762557&cc=1328194&pt=4588&jsn=397
 

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I'm just thinking normally closed till it senses oil pressure from the oil galley then it would open and break the circuit to the light. My thinking is your power supply to the light should come from a keyed circuit that would only have power with key on. Just my $.02
 
Logger1965 said:
I'm just thinking normally closed till it senses oil pressure from the oil galley then it would open and break the circuit to the light. My thinking is your power supply to the light should come from a keyed circuit that would only have power with key on. Just my $.02
Click to expand...

I agree. On some systems with safety interlocks, I think you could see N.O. switches. But not on this simple set up.
N.C. would also explain why it was on when the battery was connected.
Just My 02 cents.
 
Makes perfect sense, but no idea why they would have had it run to unswitched power. I'll just loop the positive side to the Hobbs since it is definitely switched. Thanks!
 
Had enough lead to make it to the ignition switch itself, so should be good to go. Thanks for the input.
 
Yep, should be NC. When the engine starts and there is oil pressure the switch opens and turns off the light. Probably miswired before.
 
I have had run ins with the mid to late 70's machines, they incorporated a buzzer. ( drives people nuts ) but the circuit had two sides. a hot all the time side for oil lights and a keyed side for the buzzer. alternator lights were hot all the time as well..

a wire diagram will tell all. ( tucker mfg was probably creating machines to satisfy many specifications, military, tele, utility )
 
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