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As I understand it, a coil with a ballast resistor has to have another contact somewhere to short-circuit the resistor while starting. If you only have 2 terminals, it can't have an internal ballast resistor (can it?). With a ballast resistor, the starter motor connects direct to the coil while starting, when you may only get say 9 volts due to voltage drop with the huge starting current, so at starting, you get a full spark. When running, the ignition current drops 3 volts across the resistor, leaving the coil with its 'full' 9 volts. The Bosch 'Red' coil uses a ballast resistor, but I've not had one so don't know if it uses an external or internal one. The Blue 'Sports' coil just has extra turns on the secondary windings to give more volts. Some coils use a resistive wire as the ballast resistor (watercooled VWs?) plus a direct connection to the starter solenoid to give it the full voltage under starting conditions. If I have this all wrong, please tell me kindly! Dave. UK VW Type 3&4 Club www.hallvw.clara.net/ -----Original Message----- From: type3-d-request@vwtype3.org <type3-d-request@vwtype3.org> To: type3-d@vwtype3.org <type3-d@vwtype3.org> Date: 02 September 1998 06:12 Subject: type3-d Digest V98 #263 ------------------------------------------------------------------- Unsubscribe? mailto:type3-request@vwtype3.org, Subject: unsubscribe