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Check the 12v signal wire to the relay. Verify its not the signal which means it may be the relay itself.
 

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Glow plugs are on and off for a few minutes after a cold start -- the PCM uses the temp sensors on the engine to determine how long to run the glow plugs -- maybe monitor the action of the relay and see if it stops in a couple of minutes -- some add a light to the output of the relay, so they can watch the action

Not sure on a '96 if ForScan will monitor the temp sensors -- @White95f250 do you know?
I think it should. Car Gauge Pro app on my Android phone shows them.
 
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