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1997 - 2003 F150 1997-2003 F150, 1997-1999 F250LD, 7700 & 2004 F150 Heritage SPONSORED BY:

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Old 07-13-2013, 05:59 PM
labadida1 labadida1 is offline
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1999 F250LD 5.4L Auto 4X4; No start, low voltage at Inertia switch

Hello All, I am new to the forum, I live in Morrow, Ohio. I bought this truck and have been working on this problem for two full days. It has been sitting for over a year and was told it needed spark plugs and a battery. I replaced both items and it turned over, would start with starting fluid but only briefly. I disconnected the fuel line on the tank side of the filter and had my son turn the key on several times, no fuel. I reconnected the line and tested voltage at the tank (Pink and blue (+) and black (-). No voltage. I went to the fuse box under the hood and have good 15A fuse with 12.5V there with the key on. The relay also makes 3 audible clicks when I turn the key on. I tested the inertia switch green/yellow wire; 6.8V grounded to the truck or to the small brown wire. I looked at the condition of the green/yellow wire up and into the harness and it did not appear damaged. Any advice on where this green/yellow wire travels to? I had read that it goes to the fuse box inside but did not see a listing for this in the manual. Any advice on this would be appreciated! Thank You.
Noel
1999 F250LD 4X4
142k
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Old 07-13-2013, 10:22 PM
Bluegrass 7 Bluegrass 7 is offline
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Bluegrass 7 has a good reputation on FTE.Bluegrass 7 has a good reputation on FTE.
In a user manual page 151 look at fuses 19 and 32 in the engine bay fuse box.
Good luck.
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Old 07-14-2013, 08:17 AM
labadida1 labadida1 is offline
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Good morning thanks for the information I checked the voltage on 19 with the key on and didn't get voltage, it's listed as the trailer Stop and right turn lamp. I did not see a listing for a fuse number 32.though. Do you know where the green/ yellow wire initiates does it come directly from the fuse box to the initertia switch? Thanks
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Old 07-14-2013, 09:50 AM
vaper vaper is offline
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You need to look at the logic of the system
The inertia switch shuts off power to the fuel pump in case of an accident.

You have a voltage drop at the switch so it must be from the power source
(provided you had a good ground on the tester)
That is (fuse 19 in my f150),the fuel pump relay, or the circuit (wire)itself
I suspect the relay or corrosion at the fuse
good luck keep us posted
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Old 07-14-2013, 09:50 AM
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