Technical stuff > Ignition
Wiring coil and ballast resistor
mangocrazy:
When investigating why my electric Huco fuel pump was only working intermittently, I discovered that the coil (the input to which I was using as a 12v switched source) was actually only receiving slightly over 7v due to the ballast resistor doing what it was designed to - lower the voltage. If you've fitted a new, modern coil I would personally dispense with the ballast resistor. If it's NOS and of same spec as OE, then continue with the ballast resistor.
Once you've satisfied yourself with the wiring, of course.
peteracs:
Hi Graham
I think you may need to be a little more careful.
I wonder if the ballast is there to limit the current through the electronic ignition, so if you put a coil with too low resistance then you may end up burning out the input circuit to the electronic ignition. It may of course be there for other reasons, but worth checking the coil impedance.
Peter
JohnFol:
Hi Peter, bit worried about blowing the electronic ignition so I'm after a sanity check. With all wires disconnected
* old coil - 2.1 ohms
* new coil - 2.3 ohms
* ballast - ~2.4 ohmsO-level electronics suggests I will only get ~6v at coil so perhaps that explains why the previous owner shorted it out, i.e. 12v better than 6v at coil
I am looking at the carb set up next, but want to make sure the electrics are correct.
Graham, I too am taking a feed from the 12v side of the ballast to a huco, in my case it's via a relay. Would you mind (or anyone) measuring the ballast resistor whilst disconnected to see if it's similar to mine, or 0.9 ohm as the diagram I posted suggests it should be?
peteracs:
Hi John
I am away for the next week or so, but will measure the coils I have, I should have electronic ignition and have standard ones to see what the values are. Not sure if I have the ballast resistor.
Peter
JohnFol:
Spoke to Ignition Car Parts who tested their stock Bosch 0 227 900 002 and it was 1.5 ohm. I found a few on eBay with same bosch number and they seemed to be stamped 0.9 , so not sure where to go from here..
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