coil voltage
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coil voltage
I have a 51 ford truck with a 351w I think its a 73 or 74 . Has points and condenser in distributer. How many volts should show on the positive termanal of coil. I checked and it shows 12.5 and up. There is a white resistor on the fire wall what is this for? How do you know if it is bad. How do you check. Thanks for the help I wanted to check this out Iam going to install a pertronix this weekend.
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Joined: Jun 1999
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From: Comox Valley, Canada
coil voltage
12.5 is high, IMHO. It should be closer to 9 with the key to run and engine off, points open.
There usually is a ballast resistor, or a resistance wire, to step the voltage down. I beleive it is to increase point and coil life.
In that type of system you can see battery voltage when the key is held to start.
Sparky
There usually is a ballast resistor, or a resistance wire, to step the voltage down. I beleive it is to increase point and coil life.
In that type of system you can see battery voltage when the key is held to start.
Sparky
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coil voltage
The *white resistor* you mentioned is the ballast resistor.
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Joined: Jun 2002
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From: Elizabeth City, NC
coil voltage
>How do you know if it is bad.
To check this resistor remove it from the circuit. Set your multimeter to resistance and measure across it. If it reads infinity than it is open. Resistors hardly ever short but it is a possibilty so make sure it is not 0.0 ohms too.
Russell
1968 F250 LWB 300-6
FORD=First on Race Day
MOPAR=Mostly Old Parts and Rust
GMC=Got a Mechanic Comming
To check this resistor remove it from the circuit. Set your multimeter to resistance and measure across it. If it reads infinity than it is open. Resistors hardly ever short but it is a possibilty so make sure it is not 0.0 ohms too.
Russell
1968 F250 LWB 300-6
FORD=First on Race Day
MOPAR=Mostly Old Parts and Rust
GMC=Got a Mechanic Comming
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