Sorry, it's an 85 740 d24t. Thought I added that.
I grounded the coolant temp wire and gauge went to full hot, so it's the sensor. Have one on the way.
It must be the relay, the glow plug light comes on in pos. 2 but would previously never go out. Today the light wouldn't go off once the car had started, so I tried tapping on the relay and it went out. Then, with the car warm I started again and the light didn't come on, so it must have been working properly (seeing warm temp from sensor and not activating plugs). Either way, I'll be looking for a replacement relay. Don't suppose these are still available new from Volvo?
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