Hello members. I have recently replaced a fixture's ballast and tombstones and am only getting one side to light. After checking all connections and triple checking the diagram I decided I must have purchased a faulty ballast. So I sent it back and picked up another from Menards, only to have the same result, one side working. The wiring is exactly the way it's illustrated on the ballast and I'm scratching my head...if anybody can give me a clue on how to diagnose my issue I would be grateful.i have a cheap multimeter but can't find a good site that can help me find the numbers I should expect to see. Could it be insufficient supply wires? A tombstone issue? Not properly grounded? I pressed the tombstones toward the ends of the bulbs thinking they weren't making contact but it didn't help. Thank you for your time. Aahpoo

 

Welcome to the forums.

The HO in the ballast part number signifies hot output and high output tubes with special sockets need to be used.

What is the tube model number ?

 

LWF54T5HO/805 and the ballast is long, not sure what part is relevant so I will give all I see:
QHE 4×54T5HO/UNV PSN HT SCL
And the tombstones have 120-500v on them

 

Ok.... so you are using HO tubes and I presume HO sockets.
That ballast looks like it will handle from 1-4 54T5 tubes.
How many tubes are you connecting ?
Did you set switch 1 and 2 correctly ?

I didn't see the T-5 originally so they will be a small bi-pin socket.
So this would probably be some type of high output shop light.

 

I don't know what you mean by switch 1 + 2....I just wired the ballast directly to a plug, no switch
Yes it's a shoplight.
And all four tubes

 

Again..... how many tubes are you connecting ?

 

That was the last thing I said, four tubes

 

Ok..... there isn't actually switches..... it's connecting outboard switches to control the lights.
Since you've connected four tubes..... you need to connect both the red/black and black from the ballast to the incoming black/hot wire.



To further clarify..... there are two incoming power wires so that you can run half the ballast if you are connecting 1 or 2 tubes...... OR..... you can connect the black to one wall switch and black/red to another so that you can turn on 2 or 4 tubes.

 

Aaahhhh....now THAT makes sense. Will give it a go. Thank you, kind person.

 

Yup! That was it 🤗👍✌️can't thank you enough!

 

Surprised nobody gave you he standard "should have replaced with LED" response!

But you should have before spending time and money on outdated lighting!