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Old 09-16-2010, 18:21   #1 (permalink)
gte
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Looking for a wiring diagram for a 97 F250

Hi,

I'm trying to fix my cousins dash brake light and I'd like to see the schematic for his vehicle so I can track down what is causing it to constantly illuminate.

If I can get the chassis wiring diagram or brake system wiring diagram, I can trace down the circuit and figure out where the faulty component or short is.

If they aren't available for free, a site to pay and download is fine.



He has a :

1997 F250
w/ ABS
Extended cab, 4wd
5.4L
4 speed auto trans


Thanks for reading!
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Old 09-16-2010, 18:51   #2 (permalink)
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Re: Looking for a wiring diagram for a 97 F250

This is all that I could find. Hope it helps

Turn/Stop/Hazard Lamps

1of3

2of3

3of3
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Old 09-16-2010, 20:21   #3 (permalink)
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Re: Looking for a wiring diagram for a 97 F250

Is it the light on the dash for the brake warning? If it is, it could be low on brake fluid or the park brake switch.
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Old 09-16-2010, 20:41   #4 (permalink)
gte
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Re: Looking for a wiring diagram for a 97 F250

Hi jwko,

Thanks for posting that.

Is there anything that has the circuit/schematic for the dash "brake" light?




@Bert, it's the dash light. I bypassed the ebrake switch, checked the fluid on the reservoir and bypassed the level sensor on the reservoir, the light still stays on. I figured I'd stop looking for a needle in a haystack and get a wiring manual. By bypassed, I mean I took my DMM, found whether the sensor needed to be closed or open and simulated the off condition of that sensor.
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Old 09-17-2010, 03:39   #5 (permalink)
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Re: Looking for a wiring diagram for a 97 F250

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Old 09-17-2010, 03:50   #6 (permalink)
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Re: Looking for a wiring diagram for a 97 F250

Also found this TSB

Quote:
Article No.
98-9-13

05/11/98
^ WATER LEAKS - VARIOUS AREAS OF VEHICLE

^ ELECTRICAL - ACCESSORIES FUNCTIONING IMPROPERLY DUE TO WATER LEAKS

^ LAMPS - WARNING LAMPS ILLUMINATED DUE TO WATER LEAKS

LIGHT TRUCK:
1997-98 EXPEDITION, F-150, F-250 LD
1998 NAVIGATOR

This TSB article is being republished in its entirety to add F-150, F-250 LD, and Navigator vehicles, and to revise the text and art accordingly.
ISSUE
Water leaks in various areas of the vehicle as identified below may be causing electrical concerns such as:

^ Warning lamps illuminating, and/or

^ Improper wiper operation, and/or

^ Improper function of electrical accessories

The water leaks may be caused by sealer skips, unseated grommets, and/or clogged drain tubes.

ACTION

Repair the water leaks. Refer to the following Service Procedures for details on:
^ Windshield Leaks

^ Cowl Top Leaks

^ Cowl Side-to-Door Opening Panel Leaks

^ Cowl Side-to-Dash Panel Leaks

^ Moon roof Leaks

^ Grommets

The following procedures may include using a seam sealer for repairs. Recommended seam sealers are:

Company Part Name Phone Number

3M Ultrapro Seam Sealer (612) 733-5547 - US

Kent Uniweld Seam Sealer (800) 654-6333 - US
(800) 663-2800 - Canada

OTHER APPLICABLE ARTICLES: NONE

SUPERSEDES: 97-19-15

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
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Old 09-18-2010, 07:01   #7 (permalink)
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Re: Looking for a wiring diagram for a 97 F250

Thank you jwko, I believe that will help greatly.
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Old 09-28-2010, 06:36   #8 (permalink)
gte
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Re: Looking for a wiring diagram for a 97 F250

Is there a "how to read this manual" section?

I'm not sure what the 0v(***) means and I believe the parallel lines mean it is a power wire, while the perpendicular lines mean it is a ground wire under normal operating conditions?

I'm getting full alternator voltage at the brake fluid level indicator switch and I'm getting only 2v at the parking brake level switch when the brake is fully disengaged.

That looks like my issue as the diode segments the two circuits. But I gave the parking brake wire 14v through a 1k resistor and the lights still stayed on, which is confusing me. Based on the circuit, that should have turned it off?
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Old 09-28-2010, 08:41   #9 (permalink)
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Re: Looking for a wiring diagram for a 97 F250

Did you try unhooking the wire at the park brake switch to see what happens?
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Old 09-28-2010, 11:13   #10 (permalink)
gte
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Re: Looking for a wiring diagram for a 97 F250

I did, it only has 2v when unhooked where as it appears by the diagram it should have 12-14v?

I also put 12v to it to see if that changed anything and it did not. It also appears by the diagram that would put it in a default state.

That's why I was asking for the schematic map key, so I could see if I was misunderstanding any symbols on it




Quote:
Originally Posted by Bert View Post
Did you try unhooking the wire at the park brake switch to see what happens?
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