This applies ONLY if you have a 
oil filled
canister style coil mounted horizontal.
Look at the coil tower end and check that
the (+) and (-) posts are positioned
at 3 & 9  o'clock.  If not, one post may not
be internally submerged in 
oil.  This will lead
to overheating, degradation or early failure.
If mounted vertically then disregard.