Voltage Readings ... 55 BelAir - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 15th, 10, 02:52 PM Thread Starter
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Voltage Readings ... 55 BelAir

There may be a simple explanation, but I don't know it yet. I have stock wiring other than an alternator w/int regulator conversion and I use a Crane XRI conversion unit. In taking voltage readings with car running, I get approx 14.5 to 14.9 volts at alternator and at battery; however, at the ballast resistor, I get 15.9 to 16.0 volts.
This is both sides of the resistor. I see similar higher voltage at the coil. With engine off, I get a little more than 11 on input side of resistor and 9+ on output side. Can anyone explain why the voltage is so high around resitor and coil. Is this some kind of feedback from the coil? Thanks in advance ... Steven
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post #2 of 5 (permalink) Old Dec 17th, 10, 09:45 AM
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Re: Voltage Readings ... 55 BelAir

That is weird. I'd wonder about the grounds you're using to take your measurements. It could be the "additional" volt is really riding on the ground. Measure the voltage between your two ground points and see what you get. You should see a very small voltage (less than 0.1 volts). If you see that extra 1 volt - dig in to find the bad ground that's causing it.

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post #3 of 5 (permalink) Old Dec 19th, 10, 06:32 PM Thread Starter
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Re: Voltage Readings ... 55 BelAir

Long story short ... I had installed an alternator conversion harness ( int regulator ) whose installation diagram routed the smaller wire from alt clip to the "input" or 12v side of the ign ballast resistor. I think it basically requires a switched 12v source. The "output" or reduced voltage side of resistor goes to coil. I had these 2 wires reversed and it made for some wacky readings. Now, all readings are consistent. The reading on the - side of coil is still "wacky" but apparently that is the signal that the tach interprets.

Look at instructions on this link:

http://www.danchuk.com/ItemForm.aspx...9-c71701dc9155
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post #4 of 5 (permalink) Old Dec 19th, 10, 06:47 PM
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Re: Voltage Readings ... 55 BelAir

The voltage read on the coil neg terminal could be the induced voltage from the coil, the energy not used by the spark plugs as not all the field generated within the coil is not dissipated to the spark, residual voltage.

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post #5 of 5 (permalink) Old Dec 19th, 10, 08:45 PM Thread Starter
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Re: Voltage Readings ... 55 BelAir

Quote:
Originally Posted by Everett#2390 View Post
The voltage read on the coil neg terminal could be the induced voltage from the coil, the energy not used by the spark plugs as not all the field generated within the coil is not dissipated to the spark, residual voltage.

That's the exact definition of "wacky" I saw in Webster's !
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