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Ignition wireing

T

Tvertiz

Member
So we have a older grove crane at work. About a 70's model. Has electronic ignition and the wiring on the,distributer got all messed up. Not by me may I mention. As I recall there was one wire that was hot only during cranking of motor and another that was hot all the time with the key on. You used to be able to crank the motor and it would never start until you stoped cranking. When the other wire was added it would start right up. Seems like it might have needed more voltage while cranking and that is why the second wire was added. Does this sound framilar to any systems you guys know and how do the wires go. I know this is bad info but thanks for any help you can offer.
 
Never had any dealings with one on a piece of machinery, but on a standard ignition both of the wires you listed went to the hot side of the coil. the one that was hot only when cranking bypassed a dropping resister to give hotter spark when starting.
 
One wire was hot with the key on, but ran through a resister and the other came from the starter solenoid and put full voltage to the coil when the starter was engaged.
 
That's the resistor bypass wire. It will typically attach to the "R" terminal on the starter solenoid or starter relay, and connect to the "+" coil terminal.
 
A "switched" IGN wire ran from the IGN switches IGN terminal that was hot all the time the IGN switch was ON,,,,,,,,,,,,,It wired to the high input side of a Ballast Resistor,,,,,,,,,,The low output other side of the Ballast Resistor wires to the input side of the coil. The coils other low output wires to the points or an elec switch.

An Ignition By Pass circuit that's hot ONLY while the starter is engaged, wires to EITHER the low output side of the ballast resistor or the input to the coil (same place electrically). That circuit may be fed from say an I terminal on a Ford type starter solenoid that's hot ONLY while cranking or an extra side terminal on some mechanical push start switches.

The by pass circuit purpose is to feed unballasted voltage to the coil ONLY while the starter is engaged but otherwise the ign circuit is from the switch to and through the ballast then to the coil.

Got it??

John T
 
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