2002 jeep grand with p1491 fan code. have voltage running to fan but dies in between fan and relay when fan is plugged in. when connection is unplugged the relay side has 10-12v constant, as soon as its plugged to the fan... 0v... fan is new and works properly within range on bench test, relay possibly the problem?
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It's easy enough to put a jumper wire in the relay harness to bypass the relay and activate the fan. If it still doesn't work you may have a bad wire from the relay to the fan. A simple voltage test won't let you know if the wire is good enough. You need to load test the wire. Look for corrosion in connectors or on the wire.