sounds like you have a poor wiring connection causing low voltage to either the relays or the pump motor. check all wiring connections especially the ground wire connections. Low voltage or low amperage to relays can cause them to chatter and is usually caused by poor wiring connections. Your safety interlocks could possibly be the cause due to a loose wiring connection or corrosion. I would look for the parking brake safety switch somewhere around the parking brake pedal.
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Mike and Debbie: USAF Msgt Ret, DoD Civ Ret
DAV and Good Sam Lifetime Members
2014 Allegro Open Road 36LA/2014 Jeep Grand Cherokee/2018 Cherokee Trailhawk
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