dasbulliwagen Posted October 26, 2009 Posted October 26, 2009 Is the ballast resistor really needed? If I can jump it and get the engine to run would it be ok to leave it jumped, or does it really need to be there? This is on an 88 4.0 auto 4x4 Olympic edition.
Pete M Posted October 26, 2009 Posted October 26, 2009 The ballast resistor is Jeep's way of lessening the rpms of the fuel pump for quieter running.
Geonovast Posted October 26, 2009 Posted October 26, 2009 It's not necessary, but it's been suggested that it helps the pump live longer.
jpnjim Posted October 27, 2009 Posted October 27, 2009 I've done it, I also replaced it as soon as I could (= as soon as I got home). My understanding has always been, the pump is designed to run at 12-13v. When you're starting off battery power, you're in the right range, once the engine fires, and the alternator starts producing, you need the ballast resistor to bring the voltage back into range.
HOrnbrod Posted October 27, 2009 Posted October 27, 2009 My understanding has always been,the pump is designed to run at 12-13v. When you're starting off battery power, you're in the right range, once the engine fires, and the alternator starts producing, you need the ballast resistor to bring the voltage back into range. Well said, and exactly right. Unless you enjoy replacing fuel pumps prematurely, keep it in the circuit, and keep the contacts clean.
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