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Joined: Jan 2003
Posts: 410
Backyard Mechanic
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OP
Backyard Mechanic
Joined: Jan 2003
Posts: 410 |
On my 34 1/2 ton I have around 2 volts at the coil with the key on and not running ! Seems like there should be 6 volts ! I have all new wiring and new battery. What volts should be at the coil ? Thanks.
easymoney
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Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
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ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
If the points are closed then the voltage at the coil will be low. If the points are open then you should have 6+ volts at the coil. The electricity flow with the points closed is what reduces the voltage.
How Sweet the roar of a Chevy four!
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Joined: Jan 2003
Posts: 410
Backyard Mechanic
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OP
Backyard Mechanic
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Posts: 410 |
easymoney
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Joined: Feb 2002
Posts: 327 Likes: 1
Backyard Mechanic
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Backyard Mechanic
Joined: Feb 2002
Posts: 327 Likes: 1 |
WOW, it takes nerve to disagree with the Great Texan, but...
Yes, the coil current is pulling down the voltage, but it shouldn't pull down that far unless there's a dirty switch contact, bad connection, or wrong size wire. It's been a while since I owned my '53 coupe, but I think the battery side of the coil would have been within a volt of the battery voltage, if not more. The coil draws only a couple of amps, not enough to cause much drop in a good system. If you only have 2V, I'd bet the spark is pretty weak!
Wilson
Wilson
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Joined: Feb 2011
Posts: 292
Backyard Mechanic
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Backyard Mechanic
Joined: Feb 2011
Posts: 292 |
I agree with the Texan if the points are open there will be 6V at the coil each side closed very little.
The reason for this is it a compleated connection and the coil is now charged.
Al
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Joined: Feb 2002
Posts: 327 Likes: 1
Backyard Mechanic
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Backyard Mechanic
Joined: Feb 2002
Posts: 327 Likes: 1 |
With points open, no current is flowing and voltage will be same as battery on both sides of the coil.
With points closed, the low side of the battery is grounded, zero volts, but the hot side should still be close to battery voltage, unless there is a dropping resistor, as on my '37 ford and 8-N tractor.
Wilson
Wilson
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
Joined: Dec 2001
Posts: 10,379 Likes: 1 |
The 4-cylinder cars do have a dropping resistor.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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