alternator problems?

[jamesapost]

i have a 92 explorer 4x4 4.0 and iv replaced the fule pump 2 times in 6 months, every so often the truck ill lose power like it all of a suden ran out of gas, and then a split second latter it will be normal again, some times it goes months without doing this some times its every few seconds! iv changed out almost everything, the throtal postion sensor, mas air flow meter, ideal air controler, tested the fule presure regulator, new fuel pump relay, coil pack, plugs wires, checked the timing, and its good. im going nuts with this. it seems like it hapnes more often when its wet outside! i dont know thoe. i have reason to belive my alternator is bad, my question is, can a bad alternator make a truck run like this, or what else could it be???? i love this truck its got over 340,000 miles on it and other than this it runs like a champ.

 

[Iron Weasel]

Well, the fuel pump is an electric pump, so if the alternator were putting out lower voltage that what's required by the vehicle while it's operating then it might be a cause. Take the truck down to Autozone / Advance / O'Reilly / whatever you have in South Carolina and they should be able to check the alternator for you.

You ever replace the fuel filter while you were throwing other parts at it?

 

[jamesapost]

yah i did the fuel filter on the frame rale

 

[jamesapost]

iv just changed the altinater, and the bearings in the old one were bad, and now my gage dosn't move when i have on my lights, stero, AC, turn signals, ect! but i noticed that when the truck is not runing but is in the run postion the fuel pump cylinoid clicks off and on, and when the truck is runing and it revs and dropes rpm, the cylinoid clicks on and off. now i just replaced that part about 6 weeks ago, im going to do it again. what do you think about what i just told you, and dose any body know what the other two cylinoids next to it are, and are all 3 of them the same part # im thinking about switching all 3!