Author Topic: Electrical Mystery  (Read 2263 times)

Offline RAD1229

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Electrical Mystery
« on: July 13, 2006 - 10:20:03 PM »
Hey Guys,

  Just swapped out the 440 in Dads 69'RR for a 383 HP motor.  The new motor has Electronic dist. so I change car over to electronic ign.  I know that this is correct (used schematic from here).

  The problem...When I use multimeter to measure Volts at battery to insure alt is charging the meter  Goes bananas!!!  Also, when I attempt to use light to time it,  the timing lightflashes crazy!!

  I have already called Mopar performance to insure that I had wired the new box and plug correctly, They are right.  I replaced the voltage regulator.

I also tried a 2 wire and 3 wire alternator.

I found the problem when attempting to time the engine with the light.  Every thing is very spurratic (spark, voltage)  I am really stumped and hoping that you guys can help me out again.

(I can barely read the light on the mark and thats only way around at like 50* it gets too jumpy to throw a readable signal at other times.

The motor will start and run, but its really jumpy and irratic  I know I can get it smoothed out but it is going to take some of ya'lls expertise!

( Meter and light are both fairly new and work well on my smallblock)

-RAD
1972 Challenger




Offline Bullitt-

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Re: Electrical Mystery
« Reply #1 on: July 13, 2006 - 11:01:37 PM »
Wild guess, do you have a ground strap from the motor to the body?
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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Offline RAD1229

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Re: Electrical Mystery
« Reply #2 on: July 13, 2006 - 11:12:18 PM »
Yes have woven cable to body... I assume it is enough is grounded the 440
1972 Challenger

Offline Bullitt-

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Re: Electrical Mystery
« Reply #3 on: July 13, 2006 - 11:18:57 PM »
Others here have solved mystery problems by cleaning the voltage reg. mount & securing properly. Does the '69 use the electrinic voltage regulator?
Wade  73 Rallye 340..'77 Millennium Falcon...13 R/T Classic   Huntsville, AL
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Offline RAD1229

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Re: Electrical Mystery
« Reply #4 on: July 13, 2006 - 11:33:42 PM »
VR is elec. I have replaced it...
1972 Challenger

Offline 67Vette427

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Re: Electrical Mystery
« Reply #5 on: July 14, 2006 - 12:29:35 AM »
If you didn't have the problem before then something must have got changed when you hooked everything back up.

Check your timing light on another car and make sure it still works right.

Eliminate the charging system by disconnecting the alt and regulator. Run a wire from + battery to the 12 volt side of your ballast resistor and run the motor, time it and get it squared away. Then check your wiring to make sure its hooked up right. You may have plugged something on the wrong connector. Make sure your battery is no lower than 12.6 volts and no more than 14 v.

Good Luck
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Offline 71 DEPUTY

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Re: Electrical Mystery
« Reply #6 on: July 14, 2006 - 06:15:30 AM »
it sounds like a bad ground- but you have checked that, then the wild changes are something outta whack,

Rad- if you have another VR- change it- new one can be bad!!!!!