Check your glow plug relay (located in front of and to the passengers side of the fuel filter) with a multimeter. there will be 4 wires going to the relay two large and two small. with the key off there should be around 12 volts to the one large post and none to the other if there is none to either of the large posts there is a short somewhere between the battery and the relay. if there is voltage to one of the posts turn the key so the wait to start light comes on, and quickly go check the post that didn't have voltage. If the voltage reads below say 10 volts it is time for a new relay( napa part number gpr-109 not the original but alot cheaper been running it for almost a year now no hicups) If relay comes up ok have your batteries load tested, and if they come back clean it is probably safe to say you have more than a few bad glow plugs.
If it doesnt start fast you engine is most probably filthy on the inside theres probably a large build of carbon throughout your engine, start with the main things like spark plugs, injetcors and exhaust system e.g. cat converter
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