Ignition Wiring ??
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Postmaster
Joined: Nov 2009
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From: Broken Arrow , OK
Ignition Wiring ??
I am sorting out all of the wiring issues dealing with the ignition and starter circuits on the Bronco. Also I am looking for a good source for the electric choke on my Edelbrock carb.
The Edee's need a key on 12 volt power source for the choke where the factory Ford electric chokes needed less voltage and I believe were run off of the stator wire.
So what I am looking for is a key on 12 volt un adulterated power source conveniently located by the carb.
Here is a diagram of the DSII wiring:
So which of these is key on 12 volts?
This diagram may be flawed because everyone knows the 2 pin plug coming from the module goes red to white and then white to red instead of what is showing above.
The Edee's need a key on 12 volt power source for the choke where the factory Ford electric chokes needed less voltage and I believe were run off of the stator wire.
So what I am looking for is a key on 12 volt un adulterated power source conveniently located by the carb.
Here is a diagram of the DSII wiring:
So which of these is key on 12 volts?
This diagram may be flawed because everyone knows the 2 pin plug coming from the module goes red to white and then white to red instead of what is showing above.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
As you said, that diagram is flawed. The wire that feeds power to the ignition module is the White/Light Blue hash one that connects to the red on the module. But it has the resistor in it, as shown in the red wire, above. So, there is no source right there of 12v. Let me look further.
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Postmaster
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From: Broken Arrow , OK
That IS a rats nest.
If it were me I would just get a Duraspark coil and the engine harness with the horseshoe connector at the junkyard.
Your diagram is WRONG, wrong, wrong.
Junkyardidiot.com....
Your "green" coil wire should have 7+/-V in 'run' at the coil coming through the resistor.
12V Power to the red lead of the DSII module at ALL times in 'run'
12V Power to the white while cranking, At least they (kinda) got that right.
That is the one that should be connected to "I"
But that "I" terminal wasn't ever used in '80's trucks.
It is only powered while cranking, THAT'S why it dies when you let off the key.
The DSII box is not getting the correct voltage.
You'd need to tap the module into the red wire BEFORE the resistor.
Much better if you pull power from the proper ignition switch wires.
I posted a simpler color coded wiring diagram in a thread last week.
If it were me I would just get a Duraspark coil and the engine harness with the horseshoe connector at the junkyard.
Your diagram is WRONG, wrong, wrong.
Junkyardidiot.com....
Your "green" coil wire should have 7+/-V in 'run' at the coil coming through the resistor.
12V Power to the red lead of the DSII module at ALL times in 'run'
12V Power to the white while cranking, At least they (kinda) got that right.
That is the one that should be connected to "I"
But that "I" terminal wasn't ever used in '80's trucks.
It is only powered while cranking, THAT'S why it dies when you let off the key.
The DSII box is not getting the correct voltage.
You'd need to tap the module into the red wire BEFORE the resistor.
Much better if you pull power from the proper ignition switch wires.
I posted a simpler color coded wiring diagram in a thread last week.
So, which side of the resistor is BEFORE ? The module side or the battery side?
FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
Battery or ignition switch side. And, I don't think you'll easily find the resistor as I've heard conflicting reports to where they are.
The way I solved this problem was to use Field to pull a relay in. The relay input connects to the solenoid with a fuse and the output goes to the carb.
The way I solved this problem was to use Field to pull a relay in. The relay input connects to the solenoid with a fuse and the output goes to the carb.
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Postmaster
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From: Broken Arrow , OK
I don't readily see the resistor in the loom. It must be in the loom going across the core support somewhere.
Hmm.... I am not familiar with the relay set up. I know they have to have a few wires coming and going. A remote pull them in and a power supply to for it to break.
On the red wire going to the coil on the battery side, does it have the resistor in it? IOW will it drop the voltage from 12 to 10 after a few minutes? I kept thinking I was reading that somewhere and people were irregular voltage readings there. That's how it is wired in now and maybe this is why the choke is slow to come off.
Hmm.... I am not familiar with the relay set up. I know they have to have a few wires coming and going. A remote pull them in and a power supply to for it to break.
On the red wire going to the coil on the battery side, does it have the resistor in it? IOW will it drop the voltage from 12 to 10 after a few minutes? I kept thinking I was reading that somewhere and people were irregular voltage readings there. That's how it is wired in now and maybe this is why the choke is slow to come off.
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Postmaster
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From: Broken Arrow , OK
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FTE Legend
Joined: Jul 2010
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From: Northeast, OK
Oh no! I'm WRONG!!! (Why does that remind me of Roger Miller and Chugalug? 
)
Looking again, the resistor is only feeding the coil, not the ignition. Apparently the ignition has a full 12v on it.
)Looking again, the resistor is only feeding the coil, not the ignition. Apparently the ignition has a full 12v on it.
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Postmaster
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From: Broken Arrow , OK
Currently I am sharing the choke wire with the coil wire (the red one). So I am on the resistor I suppose. Where can I get power from on that wire and by pass the resistor?
Cargo Master
Joined: Mar 2008
Posts: 2,560
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From: Washington
Engine?
What IGN system are you currently using?
You could try the ALT stator output, but it will also be slow to pull off due to the lower voltage. I would see how it work if it was my truck before I looked at other options.
Jim
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Postmaster
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From: Broken Arrow , OK
The stator only puts out 7-7.5 volts. Where it is at puts out 12 and then drops to 10-10.5 volts. That's closer to 12 than 7 .
It is an 87 Bronco 351 W and DSII ignition.
So on the replacement 2 pin plug it actually has 3 pins , but only 2 are used. Then it has 2 wires on one of the pins. I am not using one of them and was going to cap it off in case it was hot since I didn't need it. I am going to look at what color the wire is that it is coming off of.
It is an 87 Bronco 351 W and DSII ignition.
So on the replacement 2 pin plug it actually has 3 pins , but only 2 are used. Then it has 2 wires on one of the pins. I am not using one of them and was going to cap it off in case it was hot since I didn't need it. I am going to look at what color the wire is that it is coming off of.
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Postmaster
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From: Broken Arrow , OK
The extra wire is on the white wire coming out of the module and as we all know actually turns into the red wire on the other side of the plug. Is that the one that has 12 volts and is before the resistor?
pedant
Joined: Jan 2008
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From: EXTREME southwest CT
Why don't you test it Bruno?
The resistor wire is inside the cab right by the ignition switch.
It is a thick pink or red wire and likely a loop due to its length.
The red lead of the DSII module gets a full 12V in 'run'.
You could likely also pick it up from the windshield wiper, which is always powered in run.
The resistor wire is inside the cab right by the ignition switch.
It is a thick pink or red wire and likely a loop due to its length.
The red lead of the DSII module gets a full 12V in 'run'.
You could likely also pick it up from the windshield wiper, which is always powered in run.
Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
Exactly... I forget exactly, but, on the module, one gets 12V in RUN and the other in START. The coil should get full voltage in START but then reduced voltage in RUN (via the ballast resistor).
Bruno - I used a red/yellow-hash wire under the hood that feeds various solenoids and engine controls on the carb, not sure if your 1987 has such a wire. It came through the firewall kinda center, it's not part of the main cluster of wires near the steering column.
Bruno - I used a red/yellow-hash wire under the hood that feeds various solenoids and engine controls on the carb, not sure if your 1987 has such a wire. It came through the firewall kinda center, it's not part of the main cluster of wires near the steering column.