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I’ve searched and can’t find any real good info. Any way where are you finding a good source under the hood to hook up a electric choke on a 72. Thanks
On my 73 Bubba connected the e choke to the back up light plug, located under the power brake booster. It works find as power is on when the key is turned. Of course he decided that back up lights were really not needed and removed the switch/harness. I purchased all the back up light harness and switch then soldered the wires to the plug with the electric choke. I think it may be easier than going under the dash for some folks.
The best place is the IGN terminal on the fuse block.
If you connect to the wiper motor as suggested that is also hot in ACC, so if you are parked and listen to the radio, etc. then the choke gets power when you don't want it to. Something to be aware of if you do use this connection.
I would not connect it to the HEI.
Mine is wired in the connector that powers the ignition on my HEI. Should I have used a fuse?
YES- a fuse blows before the wire melts and starts a fire.... That's a fuse's job- to blow to protect the wire- not the necessarily the component.
Depending on the wire- if it's the cloth covered resistance wire- the voltage is dropped and the choke will pull MORE current than a normal 12V circuit.
And as KenSny said- the ignition terminal on the fusebox is the best place to go- as it's ON only when the ignition is on and when trying to start the car.
So a separate fuse 10A ( close to the fusebox)- as the terminal is protected by a 20A fuse - which is TOO big for wire smaller than 12GA.
Another thought- use the correct type of wire- standard automotive wire with a PVC insulation is only good to 180ºF- where as the "SXL" type wire can handle up to 250+ºF
From: Into the Mystic And yet, despite the look on my face, you're still talking TN
St. Jude Donor '09 thru '25
I will add the fuse but isn't the red ignition wire in the terminal that plugs into the bottom of the coil the same power as the fuse block? It's only got power when the key is turned on, also?
I ran a wire from the IGN spot on the fuse box. Under the hood there is a wiper motor wire that is hot only with the key in the run position.
I used the IGN TAP at the fuse panel as well.
I tried the blue wire at the wiper motor in my 69 (hate crawling under the dash and never use the wipers) and didn't realize till later that my wiper motor would not go into park for some odd reason and just kept cycling after turning them on by accident. I thought the parking pawl or elctro magnet had failed in the wiper motor. Since I never use the wipers and only want them to work I didn't notice it at first.
I removed the wire from the electric choke and the darn wiper motor parked and hasn't been an issue since. I have no idea what being connected to the choke coil did but figured I would post that in case anyone else runs into it. Maybe when stil hot the coil in the choke produces a voltage until it cools off and it would not let the parking pawl operate?
Last edited by mysixtynine; May 24, 2020 at 01:28 PM.
I will add the fuse but isn't the red ignition wire in the terminal that plugs into the bottom of the coil the same power as the fuse block? It's only got power when the key is turned on, also?
You are not supposed to directly tie in to the feed to your coil for points system or to HEI in your case.
And another option is to install an oil pressure switch (ctr of pic). Run your wire to the electric choke and the other wire to the wiper wire . In this way, a current is only sent when you have oil pressure. You can work in the engine compartment or sit in the car with the key on and the choke is not hot.
If you decide to use a wire from the wiper motor the one to tap into is the yellow one from the plug with the green, yellow and blue wires.
The yellow wire- wipers/radio is ON in accessory and ignition but not start.
You really don't want to use that wire - as if you leave the car in accessory- the radio turned off- you will wipe out the battery and not even know it. Just sayin...
The correct source say gauges-pink wire or terminal 'IGN" fusebox will ONLY be on in ignition and start.
