Electrical Gremlins
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Junior Member
Joined: Feb 2003
Posts: 2
Likes: 0
Electrical Gremlins
It wont start
Wont turn over
1988 f150
sat for two years
Power at the ignition switch (replaced that hoping that was it)
Dome, Horn and Headlights work
Radio, heater, wipers, dash lights do not work.
No power to coil..
No fuel pump activity....
cleaned all connections on fenderwell.
clutch switch is fine
fuel safety switch is fine.
could the fuel electrical system disable all of those accessories?
I have power to both relays under the hood, drivers side fenderwell next to the fuel system check.
Grounded that tester and no fuel pump pressure...or activity...
BTW truck was parked for two years....
My problem is that when I trun the key to the run position, no power at coil and no fuel pump activity (EFI)
when I jump a lead to the coil from the battery the accessories work????
Is the fuel circuit part of (some) of the accessories???
I have checked all fuses, and the fuse block itself.
Nothing in the ****pit is at fault, at least visually.
I have traced all the wires in the ****pit, all seem fine.
I have power to the FI relays on the fenderwell, and power to the ignition switch (both yellows)
Wont turn over
1988 f150
sat for two years
Power at the ignition switch (replaced that hoping that was it)
Dome, Horn and Headlights work
Radio, heater, wipers, dash lights do not work.
No power to coil..
No fuel pump activity....
cleaned all connections on fenderwell.
clutch switch is fine
fuel safety switch is fine.
could the fuel electrical system disable all of those accessories?
I have power to both relays under the hood, drivers side fenderwell next to the fuel system check.
Grounded that tester and no fuel pump pressure...or activity...
BTW truck was parked for two years....
My problem is that when I trun the key to the run position, no power at coil and no fuel pump activity (EFI)
when I jump a lead to the coil from the battery the accessories work????
Is the fuel circuit part of (some) of the accessories???
I have checked all fuses, and the fuse block itself.
Nothing in the ****pit is at fault, at least visually.
I have traced all the wires in the ****pit, all seem fine.
I have power to the FI relays on the fenderwell, and power to the ignition switch (both yellows)
Senior Member
Joined: Mar 2001
Posts: 994
Likes: 0
From: Sparks, Nevada
Hi
From your tests etc...it does appear to be electrical.
You mentioned clutch switch...so you did engage clutch before trying to start? Batt. is ok...right?
Relays under hood...i assume you mean the starter relay. Put tranny in neutral (brake on etc.) jump the s.relay with wire from batt. If that causes starter motor to turn...then relay is ok. Which takes you back to the ign. switch...which you replaced....so? It appears problem between the two? neutral start switch/start circuit wiring?
I dont have real answers but if you dont have one...Haynes manual for your yr. truck...has some good info. on lots of checks you can do short of just throwing parts at it. Could cost alot more than manual. If not available...maybe local library has one. Worth a try.
Good luck...OT
From your tests etc...it does appear to be electrical.
You mentioned clutch switch...so you did engage clutch before trying to start? Batt. is ok...right?
Relays under hood...i assume you mean the starter relay. Put tranny in neutral (brake on etc.) jump the s.relay with wire from batt. If that causes starter motor to turn...then relay is ok. Which takes you back to the ign. switch...which you replaced....so? It appears problem between the two? neutral start switch/start circuit wiring?
I dont have real answers but if you dont have one...Haynes manual for your yr. truck...has some good info. on lots of checks you can do short of just throwing parts at it. Could cost alot more than manual. If not available...maybe local library has one. Worth a try.
Good luck...OT