Ballast Resistors

B

Benbecula

New member
Location
Western Scotland
Hi, 

I've been faffing around with this bike for years.  Retirement and the need to move is giving me the kick up my arse to finish all the work I've been doin but not finishing off.

The current to finish off is the wiring.  I have upgraded to new wiring loom, a set of Dyno Coils and a Sachse Ignition system. 

My question is do I still need Ballast Resistors ? 

My logic is yes as they will still need to perform the protection to the coils and ignition system. But the wiring diagram supplied with the ignition system doesn't show any ballast resistors.

Please someone with greater knowledge clear this up for me or point me in the correct direction.

Regards from a warm dry sunny Western Scotland.

Kim.





 
Hi Kim,
DMC and Sachse units cut off current through coils after about a second w/o incoming signals from the pickups. Not so with the original system, which could possibly grill the coils and ignition boxes with ignition switched on and  w/o engine running. That's why the factory added ballast resistors. So no harm is done when dropping the ballast resistors in case a DMC or Sachse unit is used.

Regards,
Stefan
 
That's why the factory added ballast resistors.
Click to expand...
They were specified by Bosch to guard against blowing the BTZ box's power transistor in the event of a non-standard coil being used.  The OE coil and BTZ box will work fine with no ballast resistors fitted.  In fact starting will be improved with a fatter spark available.

The ballast resistors are def not required for Sasche / DMC / Ignitech - or Boyer! - applications. Chuck 'em in the bin. Or flog 'em on eBay for diehard slaves to originality .
 
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