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Re: FBO Ignition system toubleshooting
[Re: Ronnman]
#1068590
09/06/11 06:26 PM
09/06/11 06:26 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
You have 12 volts on both terminals because its is not being grounded by the ECU. The ECU may not be receiving a signal from the distributor module or the ECU has a problem, maybe grounding as mentioned, or is bad. If you disconnect the distributor 2 prong connector and tap the male connect on the harness side that goes to the ECU, that should trigger the ECU to fire the coil.
You are reading the "dead end" 12V on both terminals because there is no current flow. If no current flow through a resistor (coil) the voltage drop will be zero, thus the presence of 12V on each terminal.
Ron
That is 100% correct. To add if the ballast was bad you would not have voltage to the coil as it goes thru the ballast in the run position. And you said it read .9 ohms. Do the test where you touch the male end of the dist harness to ground and see if it sparks. If it dont you need the ECU and it it does its not seeing the dist signal. Ron
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Re: FBO Ignition system toubleshooting
[Re: 383man]
#1068591
09/06/11 06:34 PM
09/06/11 06:34 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
Quote:
You have 12 volts on both terminals because its is not being grounded by the ECU. The ECU may not be receiving a signal from the distributor module or the ECU has a problem, maybe grounding as mentioned, or is bad. If you disconnect the distributor 2 prong connector and tap the male connect on the harness side that goes to the ECU, that should trigger the ECU to fire the coil.
You are reading the "dead end" 12V on both terminals because there is no current flow. If no current flow through a resistor (coil) the voltage drop will be zero, thus the presence of 12V on each terminal.
Ron
That is 100% correct. To add if the ballast was bad you would not have voltage to the coil as it goes thru the ballast in the run position. And you said it read .9 ohms. Do the test where you touch the male end of the dist harness to ground and see if it sparks. If it dont you need the ECU and it it does its not seeing the dist signal. Ron
what he said and did you find out what ohm the ballast is supposed to be? did you make sure the ECU is grounded?
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Re: FBO Ignition system toubleshooting
[Re: mikemee1331]
#1068592
09/06/11 07:40 PM
09/06/11 07:40 PM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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Posts: 4,920
Joplin, MO USA
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Ok, I was trying to learn to trouble shoot with the ohm meter and look at stuff. Don at FBO I was talking again this afternoon and done some more trouble shooting and we ended up trying another box that I had on my dad's van that wasn't too old. It fired right up so it was the box. Once running the positive side of the coil had 6 volts on it. Why the RC read differently than my shotbed I don't know.......both work so.
Anyway he cut me a deal on one of his newer units & sent it out the door today. Thanks Don.
Thanks everybody for your feedback.
Moparlee
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Re: FBO Ignition system toubleshooting
[Re: mikemee1331]
#1068595
09/06/11 08:18 PM
09/06/11 08:18 PM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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Well, it (ballast) worked with a different brain box. So.........I'm not sure what it should ohm out to. Today is was reading 1.2 where the other day it was .9 This is my Fluke meter.
The newer system doesn't require a ballast and he says to tie them together, I would probably do a nice jumper so I can go to regular system on the fly if need to.
Just so you know he says that you can run the older box with the older and the newer style for 30 minutes or so to get home if need be.
Last edited by Robbins; 09/06/11 08:20 PM.
Moparlee
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Re: FBO Ignition system toubleshooting
[Re: Robbins]
#1068598
09/07/11 07:44 AM
09/07/11 07:44 AM
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Joined: Jan 2003
Posts: 5,443
Indiana
YO7_A66
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master
Joined: Jan 2003
Posts: 5,443
Indiana
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""i think you should call him and make sure the coil he sold you is a true 12v or is internally ballasted (is that a word?)""
The new FBO coil #HR688 is a true 12v coil. (Reference, the coil can be mounted in any direction, per Don.) It looks just like the old FBO coil (size and shape) except for the writing on the coil is different. The old coil/ECU could handle 12v for a short time period (Don designed it this way for his drag car) and the new coil/ECU was designed for 12v all the time.
I know for a fact that the new coil and the old coil are not the same unit. I started emailing Don in the Spring of 2010 to see if he was going to come out with a 12v coil and he had already been testing one for a while. Last fall (2010) when I wanted to swap to a 12v coil, I emailed him again about his 12v coil and it was still not ready. Then this past Spring I emailed him again and it was being tested but still not ready. This past Summer he started selling them and I now have one and I have been running it now for about 6 weeks. Don's ignition parts may be a little more expensive, but Don sells a very nice Mopar ignition system.
1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
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Re: FBO Ignition system toubleshooting
[Re: mikemee1331]
#1068601
09/25/11 08:32 AM
09/25/11 08:32 AM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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Joplin, MO USA
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I haven't called him yet, but the new box is on and working here are a couple of pictures of the newer box.
Moparlee
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Re: FBO Ignition system toubleshooting
[Re: NachoRT74]
#1068607
09/25/11 11:07 PM
09/25/11 11:07 PM
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Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins
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 .....that's just messed up. Who ever posted that on that site......thanks for the heads up.
Moparlee
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Re: FBO Ignition system toubleshooting
[Re: Robbins]
#1068608
09/26/11 12:04 AM
09/26/11 12:04 AM
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Joined: Aug 2007
Posts: 6,095
Valencia, España
NachoRT74
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Joined: Aug 2007
Posts: 6,095
Valencia, España
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maybe IS TRUE the GM HEI module inside is nothing like a stock unit and really a Performance piece, but still on that way!!! I still can get a Performance GM kind HEI unit ( Moroso or Accel like I have foudn on the ebay ) and built into a stock original box like I posted there
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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..................
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