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Does the live wire on the choke go to a live when the key is turned on or can it go to a lve in the fuseboxes Thanks
 

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You want it to a source that turns on with the key. Otherwise if you have it on one that is always hot it will be operating even the car is not in use.
 

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1. You want switched power that is DEAD when the key is "off", and IF POSSIBLE, you'd want it dead when the key is turned all the way to "crank". It's best if it's powered ONLY when the key is in the "run" position.

2. THEN, route the power through an oil-pressure switch so there is no power if the engine doesn't have oil pressure.

You don't want the choke to heat when you're cranking the engine (because the engine hasn't started yet--you want full choke while cranking.) You don't want the choke to continue to heat if the engine stalls as it's warming up.
 

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1. You want switched power that is DEAD when the key is "off", and IF POSSIBLE, you'd want it dead when the key is turned all the way to "crank". It's best if it's powered ONLY when the key is in the "run" position.

2. THEN, route the power through an oil-pressure switch so there is no power if the engine doesn't have oil pressure.

You don't want the choke to heat when you're cranking the engine (because the engine hasn't started yet--you want full choke while cranking.) You don't want the choke to continue to heat if the engine stalls as it's warming up.
Just as a matter of curiosity is the current carrying requirement for the oil pressure switch approximately the same as the choke requirement? Thinking of wire size principally. It's been a ton of years since I last saw an electric choke.
 

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Just as a matter of curiosity is the current carrying requirement for the oil pressure switch approximately the same as the choke requirement? Thinking of wire size principally. It's been a ton of years since I last saw an electric choke.
Electric choke doesn't take much current. Not a heavy load at all. The oil pressure switch won't have any problem making/breaking the circuit.

Of course, you need a normally-open pair of terminals that close when the switch has oil pressure.
 
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