This ballast is most likely 240X480. Assuming this has no PC receptacle, the M-1000 was made with the following voltage taps reading off my catalog: 120X240; 208; 277; 240X480; 480. I'll post a copy of my PDF...

I am not sure if it IS a 240 x 480 ballast. I have no information on the ballast what-so-ever. They might of forgot to replace this ballast and it might of been a 120 x 240 volt ballast, I am not sure. Just the other two had 480 volts replacements they might of upgraded the voltage from a lower one to 480...

One possible situation is that the M1000s originally ran on 277V, then the replacement ballasts got connected to 480V instead, so maybe there was a mix of 277V and 480V fixtures.

Well since the others had 480 volt ballasts, this one most likely has a 240X480 ballast because this is definetly dual voltage since you can rewire it to work. What puzzles me is that I thought a 240v item wouldn't work at all on 120.

Well normally it wouldn't strike but I guess because 1kW ballasts have a OCV of around 430V even teh 240v tap has a step up so when connected to 120v it stepped the 120 to a voltage that was enough to strike a MV.

The funny things THIS M-1000 wasn't painted over but the other two look like they went over them and painted them a whitish color. So they must of did something with the fixtures. I am not sure.

I wonder how old is this M-1000, is there any date codes on the cap?

1972, that's what it said on the capacitor. The others are probably the same.

Thanks, and this is the cheapest 1kW MH ballast I found on eBay so far.

Still too expensive. My parents won't wanna buy that.

I see, well they sometimes go for 30. There is another 1kW MH ballast (pulse start w/ lamp) with a starting bid of $1 though, although the price seems a bit too low. Search for "Ge Multi Vapor 1000 W Bt 37".

I think this is for 120V since for the mains input I see a black and a wite wich is used for 120V

When it comes to caps, I depend on Don Scalf, he helped me with caps on a very compication connections using 175 watt MH ballast and THREE caps, 2 in series and to one in paralell....ill let him know about this post....so I suggest you to wat till Don comes in to this post...

I don't think it's the capacitors... I remember wiring my 480 volt (singe tap) Magnetek 250 watts MV ballast in a way and then the lamp IGNITED but then it didn't brighten up all the way, it went to a certain brightness and stopped. Like this one did. And that was a looong time ago when I first got the ballast.

@ Ian, why don't you buy the ballast then if you parents don't want to? I spent nearly $100 reballasting my OV25 remote ballast.

You guys need to find a cheaper place to buy your ballasts , I've spent max $20 on a HID ballast.

Also take note that most M-47 ballasts will run H-36 lamps as well.

@ Joe, the ballast was about $35. The $100 is including the box, lamp, and cord.

Hmm here's my costs:
250w MH ballast - $17.59
250w MV lamp - ~ $5.00
Cord - $3.50
10X10X4 Pull box - $28.00

Subtotal: $54.09
Tax @13% HST $7.03
Total: $61.12

- 175w MH ballast: $34
- 175W MH lamp: $15.38
- Shipping: $15.01
($64.39)
+++++
- 20ft cord: $15
- 12X12X6 box: $21.98
- 7% RI sale tax.