If you are still confused there is a wiring diagram on the ballast which can help you.
One lamp ballast wiring.
When a series ballast rapid start operates multiple lamps and one lamp fails the circuit is opened and the other lamps will not light.
In a series circuit voltages.
This happens all the time and is no big emergency.
A 1 lamp rapid start series ballast can be hard to find but it can be replaced with a 2 lamp instant start parallel ballast.
Variety of 2 lamp t12 ballast wiring diagram.
Photos 2 and 3 show how to remove the old ballast from the fluorescent light fixture.
Confirm that the new ballast matches the old one photo below and then install it as shown in photo 4.
Is this how you have it wired.
Both ballasts should be tied to the ground wire that is in the supply cable.
Tie all three under a single wire nut.
Notice how both the red and blue wires go to one lamp.
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If one lamp fails the others can keep operating as the circuit between them and the ballast remains unbroken.
It reveals the components of the circuit as streamlined shapes and also the power and also signal connections between the devices.
If you had a double lamp fixture with it s double lamp ballast and two lamps hooked up and running and then one of the bulbs burned out early the other one would still work fine.
Black and white wires are you line in probably 120v to the ballast.
Here is how a 2 lamp ballast is wired to a 1 lamp fixture.
The yellow wires are for lack of a better description are shared so pin 1 of lamp 1 and pin 1 of lamp 2 go one yellow wire.
After mounting the new ballast replace the ballast compartment cover and bulbs and it should be good for another 20 years.
Wiring this can be done a number of ways.
Series vs parallel ballasts and wiring.
You simply connect up the lamp sockets tombstone with the red and a blue and wire nut off the other blue.
Ps make sure when you do this the power is off.
1 lamp rapid start ballast.
The ballast blue wires connect to one end of the lamp the red wires connect to the other side.
Connect the neutral conductors all together under one wire nut.
Pin 2 of lamp 1 and pin 2 of lamp 2 go to the other yellow wire.
So the present flows via one part to obtain to the next one.