Crimp and use heat shrink tubing for at least 1/2" on each side of crimped connection. The soldered connection will act like a solid piece of wire, and will cause breakage at the edge of the soldered area.

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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C