I'm running a summit 4 barrel carb. I need to hook a single supplied wire from the electric choke to a fuse activated 12 volt source. Where is a good simple place to make this connection? Also do I need an inline fuse? My mind is fried at this point so I'm asking here as I cant think straight anymore. This has been an overwhelming project and I just want to be done lol. Can I run to the selonoid or is there a better place?
Many run a relay that's activated by the ignition switch wire and the contacts connect to the battery and choke.
Ok that's what I was thinking about doing. The relay I understand. So I run wire from choke to relay... Then I run ground... Then I run wire from battery side of solenoid to relay... Which wire is the ignition wire? I'm lost here.
If I remember right, you are going with a Pertronix, yes? If so, I have checked with them and it is OK to use the batt side of the coil to run a choke. That is if you are running the full 12 volts to the coil, not the resistance wire. Down side to this set up is the choke starts heating as soon as the key is turned to "run" position. Ideally, you can run an oil pressure switch that sends 12 volts to the choke only when the engine is running. It is an easy project if you have a spot on the block to add it.
I've used the coil feed on a couple installs for relay control, one my Pertronix the other points system on a friends '65 Mustang. He had connected choke directly to batt side of coil, said idle was poor,(ya think? )When idling the coil was only receiving approx 4v. The relay coil draws such a small amount of current, voltage to ign coil drops approx .2v. Differences in resistor or coil can easily cause a volt or more variance.
If your car is like my '70 there are three wires with a connector right at the drivers side firewall in the engine compartment. One of those only has power when the key is in "run" position. That can go to one side of the relay coil, the other side of the coil gets grounded. Relay common contact to fused battery +, NO contact to the choke.
You could also install one of these to turn on the relay. It senses when the engine is running by monitoring alternator output at the battery. I have one for my DRL's. https://www.ebay.com/itm/Auto-CAR-L...677312&hash=item3b207b31e6:g:cWUAAOSw-tlb0G9b
That should be red/green stripe, coil feed supplied by the resistance wire(approx 1.5 ohms) in dash harness. Other two wires are temp and oil pressure lights, at least it is in my '72. This was point of my post, using this wire for relay will only drop voltage maybe an additional .2v. If you aren't looking for miniscule changes, you'll never notice it.