Pull the OVP and shake it. If you hear rattling, it's a goner.

Be sure to hold the flap down while you're shaking the OVP. This is not a conclusive OVP test, but a lot of the older ones will rattle when shaken, indicating something is loose inside.

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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"