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 Post subject: Too Many Volts!
PostPosted: Tue Jul 20, 2021 3:09 pm 
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EFI Slant 6
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Joined: Wed May 28, 2003 9:08 am
Posts: 332
Location: Chelsea, MI
Car Model: 71 Dodge D100 64 Plymouth Valiant Wagon
Ran for about 7 or so minutes with the voltmeter pegged, so at least 18 volts. I have the HEI converted system. No spark now. What component should I look at first? What goes wrong w/ 18 volts?

Fuses are all fine.

Thanks,
Joe

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Joe Hoppe

71 D100 225 Super Six 727 AT on 2008 Crown Vic CopCar frame

64 Valiant Wagon 225 904 AT 3:23 8.75"


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 Post subject: Re: Too Many Volts!
PostPosted: Tue Jul 20, 2021 3:28 pm 
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Turbo EFI
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Joined: Mon Jan 12, 2015 5:55 am
Posts: 1287
Location: Brightwood, VA
Car Model: 1965 Plymouth Belvedere I
my bet would be the module. And, likely the voltage regulator.

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 Post subject: Re: Too Many Volts!
PostPosted: Sun Aug 29, 2021 11:31 pm 
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TBI Slant 6

Joined: Sun Jul 16, 2006 9:17 pm
Posts: 221
Location: NW New Jersey
Car Model:
I'd start with the basics. First, did you fix the problem that caused 18+ volts? If not, start there (voltage regulator, or the ground to said voltage regulator?). If so, check battery voltage to the module. Next, check distributor signal while cranking. A scope makes that easy, but you should be able to see an analog volt meter needle bounce as a back-up. (Last resort is just use a test light and see if it flickers.) If you have proper battery voltage, solid connection to the ground pin (checked with an ohm meter), pulsing distributor signal, then chances you fried the ignition module. I'd be cautious about possible damage to your instrument cluster 5 volt regulator as well, and any light bulbs that may have been turned on with that high voltage.

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