Electrical

Tiny
OHENNINGS
  • MEMBER
  • 1999 LINCOLN NAVIGATOR
  • 5.4L
  • V8
  • AWD
  • AUTOMATIC
  • 249 MILES
Truck starts runs for about 45 seconds then voltage drops and fuel pump stopes working so the truck muffels itself off had alternator checked 3 different places brand new battery few people have said something about the fuse able link. Any clues I have only 4 days to get truck running because I have a 08 Saturn with a froze tranny
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Tuesday, August 30th, 2016 AT 11:23 AM

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Tiny
JIS001
  • EXPERT
First thing you should do is have the computer scanned for codes. If fusible link was bad there would be no power to anything. What happens after it dies? Does it crank over? Are all the lights lit on the dash. Power windows operate normal?
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Tuesday, August 30th, 2016 AT 12:07 PM
Tiny
OHENNINGS
  • MEMBER
Yes after it dies it does crank over but now I'm pulling off p1000 code maybe because I don't have the gas tank fully secure I didn't want to put it all the way back and I have to take it all the way back out for some reason the battery tested good the alternator tested good but from what I've read is the battery is to start the vehicle and the alternator is to run all the equipment and all the electronics in the vehicle I'm just wondering if there is a break in the line between the alternator and battery that the alternator is not kicking on to keep the vehicle running and to keep the electronics running my voltage drops to about 11.88 and then the truck dies I've had the fuel pump out and tested it about 10 times and it worked every time and then I put it in the truck and it miraculously pumped up first it will run and then it'll just pop down like it's dying like its running out of fuel because the voltage drops on the battery to 11.88 any clues
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Wednesday, August 31st, 2016 AT 5:43 AM
Tiny
JIS001
  • EXPERT
11.88 Volts should be enough to keep the truck running. If the truck stalls out then verify you are getting spark by pulling one of the coils out. Insert a spark plug and ground it. If spark is good then verify you have battery voltage to pump at the pink/black stripe wire. If no power then check to see the inertia switch button is pressed in. It is located on lower right side passenger side. Remove the side panels under the glove box to access it. If you do have spark and power to fuel pump then the pump is bad. If no power to pump and inertia is good then check fuse #10 and fuel pump relay.

As for the charging system, you would need to do a voltage drop test on battery cables when it is running. About half a volt (0.50V) is normal. How you check that is you place the positive lead of your DVOM tester on positive cable and negative lead on positive cable of the alternator. Normally you will see 0.02 volts. Check the ground cable by placing positive lead on ground cable at battery and negative on alternator housing like the hold down bolt. If you see anything over 1 volt check for high resistance like corrosion. Have seen people replace alternator after alternator and all it was, was a corroded ground cable at the block.

Attached a diagram for the fuel pump. Hope info helps. And code P1000 just means the readiness are not set because you must of had battery disconnected that it reset the computer.
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Wednesday, August 31st, 2016 AT 3:43 PM

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