Unplug the 5-wire plug from the top of the relay. Check resistance between the contacts on the plug to ground. You should measure about 1-2 ohm.

You did not indicate how you know the relay is working, (audibly or with a voltmeter?). I you have not done so yet, check that you have 12V output at the relay when it is on.

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1985 300SD, 203,000 miles, dark blue

Lil Sarah says: "Poor old Grandma Blue Car...She's sad."