Michael J.
New User
I had a JD 420 Crawler converted to 12 volt charge. Do I need to do anything to the coil or distributor? It will only run at an idle and after a few minutes, it runs very rough
- Thread starter Michael J.
- Start date
Michael J.
New User
Does the resistor need to be a certain value
buickanddeere
Well-known Member
May as well wire it for bypass starting if using the 6V coil and a ballast.
Then again who knows what maybe in there for a coil? What is the primary resistance?
Those Dubuques start pretty good on 6V, no need to change to 12V.
Coil polarity should match the battery polarity.
Are the plugs wires on the cap properly?
Has the distributer bushing ever been changed?
Resistor or solid core wires?
Autolite 216 or 437 plugs?
Then again who knows what maybe in there for a coil? What is the primary resistance?
Those Dubuques start pretty good on 6V, no need to change to 12V.
Coil polarity should match the battery polarity.
Are the plugs wires on the cap properly?
Has the distributer bushing ever been changed?
Resistor or solid core wires?
Autolite 216 or 437 plugs?
old
Well-known Member
- Location
- Camdenton Missouri
If you have a local O'Reilly's auto parts store just ask for a VR-1 that is there part number for the ballast resister you need
Ultradog MN
Well-known Member
- Location
- Twin Cities
Around here that would be a girl about 25 or so.
Typical old tractor ignition ballast resistors are in the range of 1.25 to 1.85 ohms, some a bit less a few a bit more. If its near the resistance of the 6 volt coils LV primary (likely 1.25 to under 2 ohms) it will get you by as a 50 50 voltage divider subject to duty cycle
John T
John T
Paul from MI
Well-known Member
Not the parts gal at our local JD dealer, but she passed 25 a few years ago. She's the best.
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