Hey guys, I have an 86 trans am converted to a vortec 383 with an edelbrock carb on top. I currently have the electric choke wired to a switched 12v source on the fuse block but would like to hook it up to something that's only 12v in start/run. it gets annoying having the choke heating up and opening when the engine isn't running. my fuel pump is wired the same way and i'd like to change that as well.

Into the idea of running both the choke and fuel pump to an oil pressure switch however my car only has the single wire oil pressure sending unit for the gauge. If anyone could provide a part number for a pressure sensor that would work along with how to wire it I'd appreciate it.

 

Was the TA a carbed vehicle originally, or TPI? There may be circuits already available to do exactly what you desire.

 

it was tpi however i removed the ecm and all wiring passing thru the fender passage way, if the necessary wiring is in c100 by the booster then i would be fine

 

If you still had either the fuel pump relay or fan relay wiring still around they had what you want

 

For years now I have been powering my Edelbrock electric choke wire off the wire terminal on the alternator that is 12v only when running (alternator turning over). Its a 10/12 SI alternator, NOT single wire conversion. The one wire conversions use a regulator module with both terminals connected, which is common but not what you want. My setup has worked great since the choke only gets power when the engine is running.
The previous setup I used incorporated a common $15 oil pressure switch that had two terminals and allowed power through the terminals only when oil pressure was above about 5 psi. This also worked good, but I opted for the more simple alternator setup when I ditched the one wire alternator.

 

i still have the stock alternator and like this idea since the wiring for it runs right next to the choke’s area. i had to get a little conversion harness since my cars alternator wiring was a 2 wire and the new alternator is a 3 wire, hopefully that would still work. any idea what wire it was?

for the oil pressure switch, you just run a fused 12v to one terminal and then the choke to the other terminal correct? happen to know what i should look for when looking for a similar switch to the one you used?

 

i don’t have the fan relay and the fuel pump is now wired to run with the ignition turned on with the relay, would like to switch the fuel pump over too

 

tested my alternator wire and its hot when the ignition is turned on so that's a no go. ended up ordering a oil pressure safety switch that I'm going to wire the fuel pump and choke to. Theoretically on a 3 terminal oil pressure safety switch, I could just run the starter terminal to the starter solenoid, the fuel pump terminal to the fuel pump relay, and then the left over prong could just go right to the choke correct?

 

ended up getting an oil pressure safety switch and wiring the pump and choke to that, works great

 

Good idea to run your fuel pump off the oil pressure switch. I had an electric pump for a while and used the pressure switch for it too. I ended up going back to mechanical pump, but I think every electric pump should go through an oil pressure switch (unless your computer controls it instead). Wiring directly to ignition has several issues, and The last thing you want is to get in a crash and leave your ignition on with fuel just pumping everywhere.