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12v Generator Charge and Ballast Resistor

R

Red Raider

Member
I changed out the LoBoy from 6v battery ignition to 12v bat ignition, regulator, and coil. At first w/o the resistor and felt like the coil was too warm. I knew to check the labeling but I couldn't read it to help me determine if it had an internal resistor.

Without the resistor I was getting a good charge on the amp meter, with it, the dial barely moved. The resistor is inline from the positive post on the coil and to the post on the distributor.

The polarity is positive ground and the amp shows discharge, but I just need to reverse posts on the amp meter. Polarized the gen by jumping the bat to armature (gen).

I'm wondering if I'll get an adequate charge with the resistor installed? Hard for me to tell.
 
Resistor won't affect charging rate if you got it in the right place. Sounds like you do. Use voltmeter on batt and see if it is reading 13 or 14 volts, you are okay.
 
If youre at 12 volts now you need to EITHER use a full true (some people call internally ballasted) 12 volt coil AND NO BALLAST or else a 6 volt coil with the external series voltage dropping (12 to 6) ballast resistor.

A 12 volt coil will have somewhere around 3 to 4 ohms primary resistance as measured between its lil + and - terminals while a 6 volt will be more like 1.25 to 2 ohms.

This ONLY affects the primary ignition circuit NOT the charging system

Once the ammeter is wired correct it would swing over to - discharge if its not running n you turn on lights and/or ignition then swing to + charge running if the charging system is okay. A battery polarity reversal requires an ammeter lead swap so it dont read bass ackwards.

For a troubleshootign procedure for non charging see my URL link in a post above

John T
 
The resistor is not in the right place. It should be in the line from the switch to the coil.Polarity wont matter if you polarized properly.
 
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