Question about 1987 Ford F 150

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There are two relays under the hood, one is a green plug and one is a brown plug with a fuse link , when i turn the ignition switch to start engine it smokes the wire on the fuse link going to the brown plug relay. What does this brown relay control ? and what is the problem ?

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Can't answer that without a wiring diagram for your vehicle and actually having the vehicle, to start testing the issues.
I hope you know that you have a short somewhere.
Why do I feel that there is more involved here??
What have you been doing to the vehicles wiring??
Have you checked out the starting system for a short to ground?

Posted on May 06, 2010

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2000 JIMMY 4.3 WONT START AND KEEP BLOWING MAIN 40AMP FUSESE


What all does that fused supply B+ voltage too ? Do you know ? That would be your first thing to find out ! Do you know what a electrical distribution diagram is ? Do you know how to test electrical circuits with a DVOM - digital volt ohm meter ? Do you know what a short to ground is ?
Which fuse ? IGN A - 40 amp ,under hood fuse / relay box ? This fuse powers the Starter Relay and Ignition and Start Switch
Does your vehicle have a manual or automatic transmission ? The starter relay could be shorted inside , It's also located in the under hood fuse box . If you pull the relay out of the box it's plugged into an look on the bottom of it you would see four sets of numbers ! 30 & 87 an 85 & 86 . If you were to jump 30 to 87 in the relay box the starter should spin the engine over , not start an run just spin ! 85 & 86 is the control side . Could be the ignition switch !
That 40amp fuse powers a lot of subsystems !

Here is a web site for free diagrams !
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine , Under system click on electrical distribution , under sub system click on power distribution . Then click the search button .Click blue links one at a time . First blue link scroll down to the second diagram . You will see Ign A 40 amp fuse at the top of the page .you will also see it powers the igintion switch ,look at last part of ignition switch , when in start or run that 40 amp fuse powers all those other fuse's plus three relays i see there also . A/C compressor relay , rear window defroster relay ,daytime running lights . Any one of those circuits could have your short . You need to isolate the circuits , pull fuse's till the fuse doesn't blow !

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Replacing a fuse engine wont start 2005 hummer h2


Is the anti-theft light lit on the instrument cluster ? Won't start how ? When you turn the key to start , what happens ? Nothing ? This would be a No crank - no start condition . Now if you turn the key to start and the starter engages and spins the engine and it doesn't start an run , this is a engine cranks no start condition ! Now which is your problem ?

There are two fuse's IGN A fuse 40amp and IGN E fuse 10amp ,both are located in the under hood fuse/relay box . Also there is starter relay located in the same under hood fuse /relay box . There also is a crank fuse 10amp in the under hood fuse box . Besides the fuse's and relay ,the ignition switch or the PNP - park neutral position switch could be bad . Testing the whole starter circuit should be done ! How to voltage drop test starter motor circuit

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Where is starter cable under dash of 2000 Buick lesabre


There is no starter cable under the dash ! there is a small gage wire that goes from the ignition switch to the PCM - engine computer . When turning the key to the start position a small amount of voltage to the PCM is a signal for it to energize the start 1 relay in the under hood fuse/relay box . At the ignition switch ,connector 2 , pin B a yellow wire is this discrete voltage signal to the PCM .At the PCM this wire is at Connector-2 pin 23 . You can check for continuity with an ohm meter . Do you know what a relay is , find the start 1 relay in the under hood fuse/relay center ! You can test for power an control of the starter motor circuit ! VEHICLE RELAYS Operation Diagnosis If you had a professional grade scan tool you could view the ignition switch input to the PCM an energize the start relay in the special functions of the scan tool .

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I have a 1997 Tahoe wont start but turns over


first check with your GM dealership ,they have recall on ignition key ,based on your vin# you may get lucky,

but if not here what you star with

there is a resistor in your key(people call it chip,but it is nothing but a resistor to complete the circuit) clean both side with alcohol wipe,also check make sure there are resistance from one side to other,if it is open you need new key
here are values,yours are one of these

Resistor Values:
  • 392: Orange, White, Red Black
  • 523: Green, Red, Orange, Black
  • 681: Blue, Gray, Brown, Black
  • 887: Gray, Gray, Violet Black
  • 1,130: Brown, Brown, Orange, Brown
  • 1,470: Brown, Yellow, Violet, Brown
  • 1,870: Brown, Gray, Violet, Brown
  • 2,370: Red, Orange, Violet, Brown
  • 3,010: Orange, Black, Brown, Brown
  • 3,740: Orange, Violet, Yellow, Brown
  • 4,750: Yellow, Violet, Green, Brown
  • 6,040: Blue, Black, Yellow, Brown
  • 7,500: Violet, Green, Black, Brown
  • 9,530: White, Green, Orange, Brown
  • 11,800: Brown, Brown, Gray, Red
next take the fuel pump relay out and check it

Check the fuel pump relay first, take it out and check the pins. If they are discolored at all, I would replace it. You can clean up those pins and try it, and make sure the female spring clips are tight too.

There is a hot wire straight to the pump but it's usually a real PITA to find. It's in the big harness leaving the under hood fuses, running under the brake booster.

next you check fuel pressure make sure,pump is working correctly
with key on/engine off should read 60 to 65 psi,with engine running about 55,next as engine running take the vacuum line off the fuel pressure regulator,and pressure should go up to 60 to 65,if not regulator is bad,also check inside the vacuum line and regulator if it is wet or gas present that means diaphragm in regulator is ruptured ,it is also bad,need to be changed,BUT BEFORE CHANGING PUMP.CHANGE THE FILTER ,SEE IF THAT BRING BACK THE PRESSURE UP, if all good then you need to check for spark

let me know and I can help you more

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1 Answer

No want to start,no light check engine on,


Maybe I can give a little help. Do you have the 4.0 liter straight six engine? This should apply as well if you have the V8 engine.

:...no check engine light...:With key on, does the light turn on? If not, it may not be getting power. Have to check that first, check all fuses in the under hood relay/fuse block. The check engine light should turn on with key in on position, just as an alert that the PCM is powered, and ready to work.

"...no electric to coil..." With key on, the dark green/black wire to the coil should have battery voltage. In that fuse/relay block will be a relay called an Automatic Shut Down relay (ASD relay). When the PCM turns this relay on, power is sent to the ignition coil on the green/black wire. The power feed for the ASD relay is fuse 2, a 20 amp fuse in the Power Distribution Center -the fuse/relay block under the hood.

So you have a couple of things to check: Make sure the PCM is powered. If it is, hold your finger lightly on the ASD relay while someone turns the key to on. You should feel it click on. If it does, but no power at the coil, check if fuse 2 is sending power to the relay, and check the green/black wire from relay to coil. If no relay action, possibly a bad relay, or the PCM is not turning the relay on.
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If your car is simply not starting it could be something as simple as the neutral safety switch if you only hear a click turning the key. Disconnect under left side dash. White and has a green and black wire coming from button behind clutch pedal.

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If cranks then neutral, ignition and relay switches are fine
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Diagram of fuse panel under dashboard


2003 Excusion, V10, 2wd, Eddie Bauer

I had a hardtimefinding this informaton, hope it helps.

fuses
Fuse link
cartridge
2A Grey Grey — — —
3A Violet Violet — — —
4A Pink Pink — — —
5A Tan Tan — — —
7.5A Brown Brown — — —
10A Red Red — — —
15A Blue Blue — — —
20A Yellow Yellow Yellow Blue Blue
25A Natural Natural — — —
30A Green Green Green Pink Pink
40A — — Orange Green Green
50A — — Red Red Red
60A — — Blue — Yellow
70A — — Tan — Brown
80A — — Natural — Black
Passenger compartment fuse panel / power distribution box
The fuse panel is located below and to the left of the steering wheel by
the brake pedal. Remove the panel cover to access the fuses.
Roadside Emergencies
To remove the fuse panel cover,
turn the panel fasteners
counterclockwise.
To remove a fuse use the fuse puller
tool provided on the fuse panel
cover.

The fuses are coded as follows.
Roadside Emergencies
Fuse/Relay
Location
Fuse Amp
Rating
Passenger Compartment Fuse Panel
Description
1 15A* Adjustable pedals
2 20A* Power point -floor console
3 20A* Power point – 3rd row
4 20A* Power point -instrument panel
20A* Power point -right rear quarter
6 20A* Trailer tow turn/stop relay
7 30A* High beam headlamps / Flash to pass
8 — Not used
9 20A* Heated mirrors
10A* A/C clutch
11 20A* Radio (main)
12 20A* Cigar lighter / OBD II
13 5A* Power mirrors/switches
14 15A* Daytime running lamps
10A* Driver’s seat module memory
16 15A* Rear seat controller
17 15A* Exterior lamps
18 20A* Turn lamps/Brake on-off switch (high)
19 10A* Body security module/4x4 module
— Not used
21 25A* Rear wiper motor
22 20A* Engine control
23 20A* Engine control
24 15A* Air suspension
10A* 4-Wheel Anti-Lock Brake System
(4WABS) module
26 10A* Airbags
27 15A* Ignition switch Run feed
28 10A* EATC module module/Front blower relay
coil
29 10A* Customer access
Roadside Emergencies
Fuse/Relay
Location
Fuse Amp
Rating
Passenger Compartment Fuse Panel
Description
30 15A* Highbeam headlamps
31 15A* Clutch interlock switch
32 5A* Radio (start)
33 15A* Front wiper
34 10A* Brake on-off switch
35 10A* Instrument cluster
36 10A* PCM Keep-Alive
37 15A* Horn
38 20A* Trailer tow park lamps and backup lamps
39 — Not used
40 20A* Fuel pump
41 10A* Instrument cluster
42 15A* Delayed accessory
43 10A* Fog lamps
44 10A* PATS module, transceiver
45 10A* Ignition switch Run/ Start feed
46 10A* Left-hand lowbeam
47 10A* Right-hand lowbeam
48 10A* Rear wiper motor
101 30A** Trailer tow electric brake
102 30A** Door locks/Body security module
103 50A** Ignition switch
104 40A** Heated backlite
105 30A** Injector driver module
106 30A** Front wiper main
107 40A** Front blower motor
108 40A** Auxiliary blower motor
109 30A** Heated seats
110 50A** Ignition switch
111 30A** 4WD/Shift on the fly
112 30A** Left-hand power seats

Roadside Emergencies
Fuse/Relay
Location
Fuse Amp
Rating
Passenger Compartment Fuse Panel
Description
113 30A** Starter motor
114 30A** Right-hand power seats
115 20A** Trailer tow battery charge
116 30A** Ignition switch
601 30A CB Door window motors
602 60A** 4-Wheel Anti-Lock Brake System
(4WABS) module
210 — Not used
211 — Not used
212 — Not used
301 — Front blower motor relay
302 — Powertrain (EEC) relay
303 — Injector driver module relay (Diesel
only)
304 — Heated backlite relay
305 — Trailer tow battery charge relay
306 — Delayed accessory relay
307 — Starter relay
* Mini Fuses ** Maxi Fuses

Jan 27, 2009 | 2002 Ford Excursion

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