Re: 6 volt to 12 volt

Posted by John T (Bob n Jim?) on November 01, 2006 at 05:19:22 from (66.244.90.5):

In Reply to: 6 volt to 12 volt posted by ralbert on October 31, 2006 at 18:35:26:

Ral,

I agree some meters arent real good at reading those low ohms values, but actually I far prefer my old reliable Simpson 260 Analog meter versus my new fangled digital which I just dont trust.

NOTE 1: If you have a true full 12 volt rated coil (some call internally ballasted) you DO NOT use any external ballast resistor.

CAUTION: A true full 12 volt rated coil may be labeled "12 volts" or "12 volts no external ballast required" HOWEVER beware a coil labeled "12 volts for use with an external ballast resistor" is in reality a 6 volt coil and DOES REQUIRE an external ballast (just like it says DUH), otherwise the coil runs hot and the points burn up prematurely. The best SURE way to determine if its a 6 or 12 volt coil if youre unsure is to measure the coils primary winding resistance between its lil + and - terminals as Bob n Jim referred to.

Bob n Jim,

Far as I know the DC resistance in the typical points n condensor type of coil primary winding between its lil + and - terminals is around 1.5 to under 2 on a 6 volt or 3 to 3.5 or so on a 12 volt. Ive seen different types n brands that all read a lil different.

The DC resistance from any terminal (+ or - or high tension tower) to its case/frame ought to be extremelyyyyyyyyyy high essentially an OPEN CIRCUIT otherwise the high voltage might arc over.

The DC resistance from either the lil + or - terminals to the high tension tower (represents the high voltage secondary winding) is somewhere around 5 to 10 K ohms and one would be like 3 ohms difference to the other depending upon which of the lil terminals (+ or -) is internally attached to the high voltage winding (other end of that winding is to the tower)

Bob n Jim QUESTIONS

1) Ive seen conflicting internal wiring diagrams, some show the high voltage secondary (end opposite from tower) internally atatched on the + terminal while others show it attached to the - terminal. Your thoughts?????

2) We all know and I assume agree??? a coil is most efficient and works best if wired in the correct polarity relative to the battery DUH We also know and I assume agree??? a plug works most efficient if electrons flow from the hotter electrode tip to the relatively cooler ground strap, same as how in a vacuum tube the heater heats the cathode so the electrons flow from it to the cooler anode plate. BUTTTTTTTT my question is does merely swapping the coils leads change the direction of electron flow across the plugs gap ORRRRRRRRRRRR would it require the battery polarity actually get changed in order to change the electron flow direction across the plug gap????????????? Im NOT convinced merely swapping coil leads changes the direction of electron flow across the gap but tend to think its the other battery terminal the electrons are seeking a return flow to so ONLY battery polarity changes the flow....... NOTE dont let conventional versus electron current flow muddy the waters, in BOTH cases Im talking about the most efficient (hotter to colder) electron emission so lets consider ONLY electron flow from the tip to ground strap in either the coil lead reversal or the battery polarity changes.

A curious John T

Replies:

• Re: 6 volt to 12 volt Gerald J. 13:09:05 11/01/06 (0)
• Re: 6 volt to 12 volt Bob 05:54:12 11/01/06 (0)

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