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all the 60 watt power supplies i find = A1344, which is what i have now, say they are for 13" macbooks not 15", does it make a difference.
The A1344 60W does seem to be for a 13", but could still be correct electrically. What is the year of your 15" MBP? Is the power adapter the original one that came with your MBP at time of purchase?

Some years of the 15" MBPs did have a 60W power adapters.
Here is an Apple list of power adapters.
See this question to Apple also.
 
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