Re: How Much Voltage to Coil?
[Re: rss]
#321481
05/18/09 12:31 PM
05/18/09 12:31 PM
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Joined: Feb 2007
Posts: 308
michigan
black64
enthusiast
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enthusiast
Joined: Feb 2007
Posts: 308
michigan
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9 volts sounds right running. Checking voltage at the coil with points closed is probably where you are reading the 4.5 volts at the coil.
Last edited by black64; 05/18/09 12:33 PM.
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Re: How Much Voltage to Coil?
[Re: rss]
#321482
05/18/09 01:42 PM
05/18/09 01:42 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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Quote:
Does this sound right or do I have a high resistance issue between the battery and coil?
You have a resistance, but it's supposed to be there.
It's the ballast resistor. 
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Re: How Much Voltage to Coil?
[Re: RemCharger]
#321485
05/18/09 05:43 PM
05/18/09 05:43 PM
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Joined: Aug 2007
Posts: 902
Seattle, WA
rss
OP
super stock
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OP
super stock
Joined: Aug 2007
Posts: 902
Seattle, WA
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Quote:
B+.
???????
What is B+??????
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Re: How Much Voltage to Coil?
[Re: rss]
#321486
05/18/09 05:47 PM
05/18/09 05:47 PM
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Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Quote:
Quote:
B+.
???????
What is B+??????
in "start mode" the ballast is bypassed, connecting it straight to the battery positive, or B+
the coil is designed to work on 8 or 9 volts because when starting, that's all thats available to run it, as the starter is putting such a load on the system, that the battery voltage drops to 8 or 9 volts.
but once the car is running at 12-14 volts, it'll burn up the coil that's designed for 8 or 9.
that's why you need the ballast resistor.
**Photobucket sucks**
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Re: How Much Voltage to Coil?
[Re: 70Cuda383]
#321487
05/18/09 07:19 PM
05/18/09 07:19 PM
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Joined: Jan 2003
Posts: 10,762
North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,762
North Dakota
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Key on, engine off, points open, should have battery voltage. Key on, engine off, points closed, the voltage you have is dependent on coil current draw.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: How Much Voltage to Coil?
[Re: 6PakBee]
#321488
05/18/09 07:40 PM
05/18/09 07:40 PM
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Joined: Aug 2004
Posts: 3,333
MARYLAND
69Cuda340S
master
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master
Joined: Aug 2004
Posts: 3,333
MARYLAND
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Quote:
Key on, engine off, points open, should have battery voltage. Key on, engine off, points closed, the voltage you have is dependent on coil current draw.
Not if the current is running through the ballast resister in which case you will have significantly less volts then the battery.
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Re: How Much Voltage to Coil?
[Re: 69Cuda340S]
#321489
05/18/09 07:57 PM
05/18/09 07:57 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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Most older Mopar point ign systems will have about 6.5 to 7.5 volts to the coil if it has the right coil and ballast in the system with the key on and points closed. Of course with the points open you will read 12 volts and thats not an acurate test as volt meter needs to be hooked in paralell not in series. And with the eng running it is not a good test becaus the points are open alot and you are just seeing 12 volts from the points open. The key on eng off and points closed is the best test and yours is a bit low. Could be a bad or wrong ballast. I would hook and amp meter in series and check the amps flowing. The motors manual gives coil current values and you can compare to see the current flow as I bet it is low. Like I said most read about 6.5 to 7.5 volts. 4.5 is to low unles you run the older Acell Super Coil that had you add in another ballast to keep coil current flow down. Ron
Last edited by 383man; 05/18/09 08:00 PM.
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Re: How Much Voltage to Coil?
[Re: 69Cuda340S]
#321491
05/18/09 08:11 PM
05/18/09 08:11 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
Quote:
Key on, engine off, points open, should have battery voltage. Key on, engine off, points closed, the voltage you have is dependent on coil current draw.
Not if the current is running through the ballast resister in which case you will have significantly less volts then the battery.
No first post is correct. So, once again
key on, points open, engine not running==batt voltage
key on points CLOSED, engine not running==very low voltage depends on coil draw and a few other things, 4 volts or so is believeable
key on, engine running== anywhere from 8-10-11V depending on engine speed, charging voltage, and temp of coil/ ballast
key in START, engine cranking, ==battery voltage, say 10V or so
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