the central locking pump on my 92 300 sl runs on for a few seconds after I have started the car .I dont know how long it has done this as I only noticed when I removed the hardtop recently ,the car locks and unlocks perfectly the pump is only 6 months old and if i interupt fuse no 4 in the boot it stops instantly and does not restart when re instated is this a fault or is this normal.
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