Choke 12V+ to Ignition Coil 12V+

[cecho]

Is there any problem with running a jumper from the 12V+ on the electric choke to the 12V+ terminal on the coil? My new coil and ignition don't need the resistor wire and this is the easiest method to deliver 12V+ to the pair. It's what I'd do on a car, but I don't know if there's anything wrong with this setup for marine usage.

Chevy 305 898 MC-1 w/Pertronix.

 

[wrestling coach]

Re: Choke 12V+ to Ignition Coil 12V+

That is the way I wired my '82 470 with the Pertronix conversion. Solder and shrink wrap your connection.

Dennis

 

[cecho]

Re: Choke 12V+ to Ignition Coil 12V+

I just used a one to two prong terminal adapter on the choke and made a wire with a terminal ring on one end and a female blade connector on the other. I've got dielectric grease on the connections.

 

[wrench 3]

Re: Choke 12V+ to Ignition Coil 12V+

Is there any problem with running a jumper from the 12V+ on the electric choke to the 12V+ terminal on the coil? My new coil and ignition don't need the resistor wire and this is the easiest method to deliver 12V+ to the pair. It's what I'd do on a car, but I don't know if there's anything wrong with this setup for marine usage.

Chevy 305 898 MC-1 w/Pertronix.

It wouldn't work on a car. Most cars don't get juice to the choke until they have oil pressure.

 

[cecho]

Re: Choke 12V+ to Ignition Coil 12V+

None of the cars and trucks I've worked on went through an oil pressure switch. All the carbed vehicles I've worked on heat the choke in the run position engine running or not.

 

[cr2k]

Re: Choke 12V+ to Ignition Coil 12V+

Other then wanting to run ignition power from a source that is also running a heating element.
A little current drop.

 

[cecho]

Re: Choke 12V+ to Ignition Coil 12V+

I didn't think about that. I don't think it'll make much of a difference though.

I also left the resistor wire hooked up to the coil. Should I cut it off or just leave it on? I didn't see any need to remove it.

 

[wrestling coach]

Re: Choke 12V+ to Ignition Coil 12V+

I didn't think about that. I don't think it'll make much of a difference though.

I also left the resistor wire hooked up to the coil. Should I cut it off or just leave it on? I didn't see any need to remove it.

This was one reason I soldered in upstream of the choke 12v heating coil. I am not running the resistance wire any longer. I just disconnected it and left it in the harness and taped it off. By the way I'm sure you know that you still need the full 12v from the ignition switch when turning the key to start and when the key is released the 12v from the choke will supply the Pertronix. What engine are you working with?

Dennis

 

[cecho]

Re: Choke 12V+ to Ignition Coil 12V+

Mercruiser 898. Chevy 305 1979. I left the hot full 12v when starting wire on the coil since I didn't know if the choke was hot when starting. If it isn't than I'll lose a few amps to the choke when starting.

 

[Hoosmatroos]

Re: Choke 12V+ to Ignition Coil 12V+

Perhaps you could save your points and coil for spare in the boat just in case the electronic ignition fails (sometimes they do). Takes about 10-15 minutes to swap back. If you discard the wire then you can't use it that simple. That's the only reason I can think of to leave it where it is.

 

[cecho]

Re: Choke 12V+ to Ignition Coil 12V+

Yeah, I'll be keeping the old parts with me on board.

 

[achris]

Re: Choke 12V+ to Ignition Coil 12V+

I just used a one to two prong terminal adapter on the choke and made a wire with a terminal ring on one end and a female blade connector on the other. I've got dielectric grease on the connections.

Not the best way to do it.

That is the way I wired my '82 470 with the Pertronix conversion. Solder and shrink wrap your connection.

Dennis

This is the best way to do it. And I wouldn't do it at the choke, I'd find somewhere further back in the harness, like where the resistance wire starts. Leaving the resistance wire in doesn't hurt, and as someone said, you can convert back in an emergency. Just insulate the end so it doesn't cause any problems. I also wouldn't use any grease on the connectors, use liquid neoprene.

Chris......

 

[stonyloam]

Re: Choke 12V+ to Ignition Coil 12V+

Disconnect the resistance wire from the coil, tape the end and coil it up out of the way. I am assuming that the resistance wire is coming from the choke, so make a solder splice there (it's going to be a permanent connection), and use liquid tape to protect the connection. The blade connector could be too prone to corrosion in the moist atmosphere in the boat. If you should need to switch back to points in an emergency, just swap out the wires at the coil +. If you make the connection BEFORE the choke, there will be no voltage loss when the coil element is drawing current. To double check that you have a good splice, turn the key on and measure the battery + voltage and the voltage on the coil +, should read the same. P.S. the wire to the coil + should be stranded (not solid) wire.

 

[eavega]

Re: Choke 12V+ to Ignition Coil 12V+

I couldn't find where the resistor wire tied into the system on my Mercruiser 3.0L. It ran into a boot where I am sure some black magic happened. My solution was to trace back the purple wire from the alternator, splice into that with a soldered connection to run +12 to the coil. I cut the resistor wire and taped it back into the wiring loom. I had the resistor wire running to the electric choke, so I didn't want to just cut it out.

I haven't tested it on the water, but the motor starts and runs flawlessly on muffs.

 

[cecho]

Re: Choke 12V+ to Ignition Coil 12V+

I remember on one boat I converted a few years ago I just used the resistor wire to run a relay that had 12 volt power from the battery. I can't remember why I thought that was the best way to go about it at the time.

 

[thumpar]

Re: Choke 12V+ to Ignition Coil 12V+

When I did mine I ran a wire in parallel to the resistance wire. I taped up the resistance wire in case it was needed at some point.

 

[wrench 3]

Re: Choke 12V+ to Ignition Coil 12V+

I remember on one boat I converted a few years ago I just used the resistor wire to run a relay that had 12 volt power from the battery. I can't remember why I thought that was the best way to go about it at the time.

If you're doing this, be sure to use a vapor proof relay!

 

[cecho]

Re: Choke 12V+ to Ignition Coil 12V+

I won't be doing this, but I remember I kept the relay in a waterproof container outside of the engine compartment.