Do you know how to test automotive electrical circuits using wiring diagram's an DVOM - digital volt ohmeter ? Ford service repair manual use's pin point testing procedures to find the problem ! This is how professional automotive technicians do it .
PINPOINT TEST E: THE HEADLAMPS ARE ON CONTINUOUSLY
Test Step
Result / Action to Take
E1 CHECK THE HIGH BEAM CIRCUIT FOR SHORT TO POWER
Yes
GO to E2 .
No
GO to E6 .
E2 CHECK CIRCUIT 12 (LG/BK) TO THE HEADLAMPS FOR SHORT TO POWER
Yes
REPAIR circuit 12 (LG/BK). TEST the system for normal operation.
No
GO to E3 .
E3 CHECK THE CJB FOR SHORT TO POWER
Yes
INSTALL a new CJB. TEST the system for normal operation.
No
GO to E4 .
E4 CHECK THE HIGH BEAM INDICATOR CIRCUIT FOR SHORT TO POWER
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to E5 .
E5 CHECK CIRCUIT 632 (GY/OG) FOR SHORT TO POWER
Yes
REPAIR the circuit. TEST the system for normal operation.
No
INSTALL a new multifunction switch. REFER to Section 211-05 . TEST the system for normal operation.
E6 CHECK CIRCUIT 160 (DB/WH) AND CIRCUIT 161 (DB/OG) FOR SHORT TO POWER
Yes
REPAIR circuit 160 (DB/WH) or 161 (DG/OG) as necessary. TEST the system for normal operation.
No
GO to E7 .
E7 CHECK THE CJB
Yes
INSTALL a new CJB. TEST the system for normal operation.
No
RECONNECT the CJB C270g.
If equipped with daytime running lamps (DRL), GO to E8 .
If not equipped with daytime running lamps (DRL), GO to E10 .
E8 CHECK CIRCUIT 13 (RD/BK) FOR SHORT TO POWER
Yes
REPAIR circuit 13 (RD/BK). TEST the system for normal operation.
No
GO to E9 .
E9 CHECK CIRCUIT 1033 (RD/YE) FOR SHORT TO POWER
Yes
REINSTALL the DRL full relay No.1. GO to E10 .
No
REFER to Section 417-04 for further diagnosis.
E10 CHECK CIRCUIT 13 (RD/BK) FROM THE MULTIFUNCTION SWITCH FOR AN OPEN
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to E11 .
E11 CHECK CIRCUIT 15 (RD/YE) FOR SHORT TO POWER
Yes
GO to E12 .
No
INSTALL a new multifunction switch. REFER to Section 211-05 . TEST the system for normal operation.
E12 CHECK THE HEADLAMP SWITCH
Yes
If equipped with autolamps, GO to E13 .
If not equipped with autolamps, REPAIR circuit 15 (RD/YE). TEST the system for normal operation.
No
INSTALL a new headlamp switch. REFER to Lamp Switch - Headlamp in this section. TEST the system for normal operation.
E13 CHECK THE AUTOLAMP SYSTEM
Yes
REPAIR circuit 15 (RD/YE). TEST the system for normal operation.
No
REFER to Autolamps in this section.
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. year , make , model an engine size . Under system click on lighting , then under subsystem click on headlamps . Click the search button then the blue links .
Electric Testing Techniques You Need to Know
Replace switch
SOURCE: Ford F250 Superduty Diesel Will not start
the crank position sensor on the front of the engine has been the most problematic parts. that is where i would start
SOURCE: 2004 Ford F250 Superduty Truck Steering problems
I have had this same problem after thorough checking it ended up being a bad steering box. after replacing the box it was fine
SOURCE: ford f250 superduty turbo diesel 7.3L Will not crank
Charge the batteries. take a Reading to make sure that you are getting almost 14v to both batteries. If it is not charging then take the alternator back off and have them check it. you might have bought a bad one. There is a way to test the glow plus with out taking them out. ( Take a piece of wire long enough to reach all the glow plugs from the battery. unplug the glow plug wire.If you touch the end of the glow plug with the hot wire it should make a little spark. if no spark then the glow plug is bad. do this to each one, but one at a time)
SOURCE: ford f250 running lights, dash lights and parking lights stay on
Had the same problem and it was a short in the trailer light hook-up.
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