davisdeezle

Can someone answer some questions about this article concerning measuring AC noise across the fuel fuelpump. My question is what position do i need to have the key when i probe terminals 48 and 50 on the ECM harness. The article isnt clear on that. [TABLE=class: tborder, align: center] [TR] [TD=class: thead, align: right] #2 (permalink) [/TD] [/TR] [TR] [TD=class: alt2, width: 175]TexasTurbo Diesel Head Join Date: Aug 2011 Location: Cut N Shoot, Texas Posts: 1,555 Thanks: 157 Thanked 346 Times in 274 Posts iTrader Score: 2 reviews, 100% TexasTurbo's Truck Pics [/TD] [TD=class: alt1]Mopar1973Man's Dodge Cummins Articles - P1690 VP44 CKP Sensor Does Not Agree With ECM CKP Sensor [/TD] [/TR] [/TABLE]

I dont know how to give a link to squat on a computer.(I really hate these things). I have a thread posted on cumminsforum.com under ECM failing? If you can find that thred (my name there is also davisdeezle) you will find that link in one of the replies. - - - Updated - - - this is a link to that article [TABLE=class: tborder, align: center] [TR] [TD=class: thead, align: right] #2 (permalink) [/TD] [/TR] [TR] [TD=class: alt2, width: 175]TexasTurbo Diesel Head Join Date: Aug 2011 Location: Cut N Shoot, Texas Posts: 1,550 Thanks: 157 Thanked 345 Times in 273 Posts iTrader Score: 1 reviews, 100% TexasTurbo's Truck Pics [/TD] [TD=class: alt1]Mopar1973Man's Dodge Cummins Articles - P1690 VP44 CKP Sensor Does Not Agree With ECM CKP Sensor [/TD] [/TR] [/TABLE]

I was directed to an article posted by Mopar1973Man that was on a different forum. it concerns a P1690 engine code. it says that AC noise from my lift pump can also cause this. where does alternating current come frome on a direct current vehicle. The alternator? And why does it manifest itself in the fuel tranfer pump?