turn signal and brake light problems

[minister01]

I was changing the rear spring hangers on my 94, and in the process of grinding some rusty bolts I cut in to the trailer brake and light wiring. I figured no big deal I'll just repair them once I had everything done. Well I did repair the wiring and I have no brake lights or signals, including hazard flashers. I checked all the fuses and replaced the turn signal flasher. Still nothing. I then thought somehow the multi function switch may have gotten damaged, so I replaced it. Still nothing. The tail lights work fine and the third brake light on the topper works with the brake pedal. Anyone have any ideals?

 

[miesk5]

yo M,

WELCOME!

Let's see if you can view this 94 Bronco brake/turn wiring diagrams;

http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=43847

If not, see it at http://www.revbase.com/BBBMotor/

go thru the drill,

Search Wiring Diagrams

Year

Make Ford

Bronco Engine 5.0/5.8

System Lighting 

Subsystem  Stop Lamp

or see Turn, Tail, Brake & High Mount, Head Light, Side Marker, Hazard Wiring Diagram in 92-95 Bronco & F Series
Source: by Steve at http://www.supermotors.net/registry/media/831135

btw, Ground G100 is Black wire- Location in Engine Bay pics: G100 @ LH front of engine compartment on upper radiator support-in front of WS washer/Coolant overflow tank by subford (Bill K)



Check ground ckt G100 where you were working on spring hangers

btw, Here is the 94 Bronco-Econoline-F-Series Workshop Manual by Ford

https://www.motorcraftservice.com/pubs/content/~WSRM/~MUS~LEN/21/SRMLEFT.HTM

see;

 
Section 17-01: Lighting, Exterior
 
DIAGNOSIS AND TESTING
https://www.motorcraftservice.com/pubs/content/~WSRM/~MUS~LEN/20/SRMH1011.HTM

• Stoplamps do not work.

• Fuse burned out.

• Replace fuse. If fuse blows again, check for short circuit. (Refer to Section 18-01.)

 

• Worn or damaged turn signal circuit.

• Check turn signal operation. Repair as necessary.

 

• Loose wiring connections.

• Secure connection at stoplamp switch.

 

• Worn or damaged stoplamp switch.

• Replace stoplamp switch.

 

• Open circuit in wiring.

• Repair as required.

Symptom Chart

• All lamps of turn indicator lamps do not light.

• Fuse or C.B. burned out.

• Replace fuse or C.B. If fuse or C.B. blows again, check for short circuit. (Refer to Section 18-01).

 

• Worn or damaged indicator flasher .

• Substitute a known good flasher. Replace if required.

 

• Loose wiring connections.

• Secure connections where accessible.

 

• Open circuit in wiring or poor ground.

• Repair as required.

 

• Damaged turn signal switch.

• Check continuity of switch assembly. Replace turn signal switch and wiring assembly if necessary.
• Go to Pinpoint Test B .

• Hazard flasher lamps do not flash.

• Fuse or circuit breaker burned out.

• Replace fuse or circuit breaker. If fuse or circuit breaker blows again, check for short circuit. (Refer to Section 18-01.)

 

• Worn or damaged hazard flasher.

• Replace flasher if damaged.

 

• Worn or damaged turn signal operation.

• Repair turn signal and windshield wiper switch .

 

• Open circuit in wiring.

• Repair as required.

 

• Worn or damaged hazard flasher switch.

• Repair or replace the turn signal switch and wiring assembly which includes the hazard flasher switch.
• Go to Pinpoint Test F .

Circuit Common Points (Typical)
 

Common point diagnosis should be used to isolate or pinpoint the most probable cause of a problem in a multi-load circuit (a circuit with more than one operating component) without making any tests. If one system functions properly but another does not, the problem must be in the part of the circuit unique to the inoperative system.

If more than one circuit does not operate, check for blown fuses

 

[minister01]

Thank you very much. I will check over everything.

 

[minister01]

Got it fixed. Thanks again.

 

[Seabronc]

Got it fixed. Thanks again.

Glad to hear it, what was the problem.  Somebody in the future may benefit from what you found.

>-

 

[minister01]

It was a bunch of hacked up trailer light wiring done by the po.