It'll usually be on top of the trans bell housing on the drivers side. Some models you can get there from the top, others only from below.

It can be tested with a meter. Cant remember the procedure but search should find it.

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)