Re: Electronic ignition conversion on 70 Dart
[Re: dirt]
#3040318
05/06/22 12:50 PM
05/06/22 12:50 PM
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Joined: Jan 2003
Posts: 4,733 Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,733
Moved to N.E. Tennessee
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This Link shows the correct wiring. Please tell us where each of these wires goes on yours.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: Electronic ignition conversion on 70 Dart
[Re: metallicareload]
#3040332
05/06/22 01:25 PM
05/06/22 01:25 PM
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Joined: May 2019
Posts: 6,291 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,291
nowhere
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You want 12+ volts at all times powering the ECU. That might explain some of the no starts, voltage drop when cranking and coming through the ballast resistor might be so low the ECU doesn’t know it should be firing. Full battery voltage in start ONLY. Thru the ballast in run. Go look at the wiring diagram Gomango linked.
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Re: Electronic ignition conversion on 70 Dart
[Re: Sniper]
#3040339
05/06/22 01:32 PM
05/06/22 01:32 PM
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Joined: Oct 2005
Posts: 272 Anchorage, Alaska
metallicareload
enthusiast
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enthusiast
Joined: Oct 2005
Posts: 272
Anchorage, Alaska
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You want 12+ volts at all times powering the ECU. That might explain some of the no starts, voltage drop when cranking and coming through the ballast resistor might be so low the ECU doesn’t know it should be firing. Full battery voltage in start ONLY. Thru the ballast in run. Go look at the wiring diagram Gomango linked. Full battery to ECU cranking and running. Full battery to coil when cranking. Thru ballast to coil when running.
440, 4-Speed, 3.54 1968, when Dinosaurs ruled the Earth
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Re: Electronic ignition conversion on 70 Dart
[Re: metallicareload]
#3040344
05/06/22 01:39 PM
05/06/22 01:39 PM
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Joined: May 2019
Posts: 6,291 nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,291
nowhere
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You want 12+ volts at all times powering the ECU. That might explain some of the no starts, voltage drop when cranking and coming through the ballast resistor might be so low the ECU doesn’t know it should be firing. Full battery voltage in start ONLY. Thru the ballast in run. Go look at the wiring diagram Gomango linked. Full battery to ECU cranking and running. Full battery to coil when cranking. Thru ballast to coil when running. You know what, you are right.
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Re: Electronic ignition conversion on 70 Dart
[Re: dirt]
#3040345
05/06/22 01:44 PM
05/06/22 01:44 PM
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Joined: Oct 2005
Posts: 272 Anchorage, Alaska
metallicareload
enthusiast
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enthusiast
Joined: Oct 2005
Posts: 272
Anchorage, Alaska
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It will IF the dark blue wire is energized when cranking, I don’t know if that’s the case or not
440, 4-Speed, 3.54 1968, when Dinosaurs ruled the Earth
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Re: Electronic ignition conversion on 70 Dart
[Re: Sniper]
#3040350
05/06/22 02:00 PM
05/06/22 02:00 PM
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Joined: Jan 2003
Posts: 4,733 Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,733
Moved to N.E. Tennessee
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You want 12+ volts at all times powering the ECU. That might explain some of the no starts, voltage drop when cranking and coming through the ballast resistor might be so low the ECU doesn’t know it should be firing. Full battery voltage in start ONLY. Thru the ballast in run. Go look at the wiring diagram Gomango linked. Might want to look at the link again. The coil is the one that gets 12V at start only and goes through the resistor at run. Full voltage to the ecu. Does not go through the resistor.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: Electronic ignition conversion on 70 Dart
[Re: dirt]
#3040443
05/06/22 09:03 PM
05/06/22 09:03 PM
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Joined: Jan 2003
Posts: 15,444 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,444
Omaha Ne
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Had a customer several years back with a random no start problem. He wound up here on a recommendation after several shops couldn't fix it but took his money claiming they had I asked him what do you do when this occurs? he said wait. i asked how long? Usually 20 minutes to an hour. I found the exact thing you are describing. The ECU power was going through the ballast. OOPPS! I corrected the wiring. When he picked it up he said "I'm not convinced you fixed it as I have been told this many times" I said bring it back if it happens again. So every time I saw him at a show I'd ask if it had failed yet. he always said no. After a few years he would just say NO without my saying anything LOL. I'll have to ask him again next time I see him as it's been about 20 years now I'll close with saying electronic devices are not always predictable. Sometimes a 12V device will function on 8-9 V and sometimes it won't depending on a ton of variables, mainly it's mood LOL
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Re: Electronic ignition conversion on 70 Dart
[Re: metallicareload]
#3041383
05/11/22 07:01 AM
05/11/22 07:01 AM
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Joined: Jan 2003
Posts: 11,080 Berlin, N.J.
abodyjoe
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,080
Berlin, N.J.
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You want 12+ volts at all times powering the ECU. That might explain some of the no starts, voltage drop when cranking and coming through the ballast resistor might be so low the ECU doesn’t know it should be firing. Full battery voltage in start ONLY. Thru the ballast in run. Go look at the wiring diagram Gomango linked. Full battery to ECU cranking and running.
Full battery to coil when cranking.
Thru ballast to coil when running. this is the correct way.
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt. www.MoparMisfits.com
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