Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSELECTRICAL DIODE - IDENTIFICATION AND REPLACEMENT
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Electrical Diode - Identification and Replacement
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Electrical Diode - Identification and Replacement
Article No.
96-24-6
11/18/96
WIRING - ELECTRICAL DIODE IDENTIFICATION AND SERVICE REPLACEMENTS
FORD:
1984-86 LTD
1984-88 EXP
1984-94 TEMPO
1984-97 CROWN VICTORIA, ESCORT, MUSTANG, THUNDERBIRD
1986-97 TAURUS
1989-97 PROBE
1994-97 ASPIRE
1995-97 CONTOUR
LINCOLN-MERCURY:
1984-86 MARQUIS
1984-87 LYNX
1984-92 MARK VII
1984-94 TOPAZ
1984-97 CONTINENTAL, COUGAR, GRAND MARQUIS, TOWN CAR
1986-97 SABLE
1987-89 TRACER
1991-94 CAPRI
1991-97 TRACER
1995-97 MYSTIQUE
MERKUR:
1985-89 XR4TI
1988-90 SCORPIO
LIGHT TRUCK:
1983-97 RANGER
1984-90 BRONCO II
1984-97 ECONOLINE, F-150-350 SERIES
1986-97 AEROSTAR
1991-97 EXPLORER
1995-97 WINDSTAR
MEDIUM/HEAVY TRUCK:
1984-91 C SERIES, CL-CLT-9000 SERIES
1984-97 F & B SERIES, L SERIES
1986-97 CARGO SERIES
1996-97 AEROMAX, LOUISVILLE
This TSB article is being republished in its entirety to update the applicable model years.
ISSUE:
Electrical system concerns that are due to diode failure may be serviced with an approved Ford service diode. Some electrical diodes used in early production vehicles are color coded for the purpose of size identification while others are stamped with a manufacture number. All Ford service diodes and current production diodes are identified by manufacture number.
ACTION:
If service is required, refer to the appropriate model/year Electrical and Vacuum Troubleshooting Manual (EVTM) to determine the size and location of the diode(s). Refer to the following Electrical Diode Application Chart for the correct service part number.
NOTE:
IF THE DIODE REQUIRING REPLACEMENT DOES NOT HAVE THE SAME RATING AS LISTED IN THE APPLICATION CHART, USE THE NEXT HIGHER RATED DIODE.
ELECTRICAL DIODE APPLICATION CHART
PART NUMBER PART NAME
E8DZ-10C912-A Diode - 1.0 Amp - 400V
E8DZ-10C912-B Diode - 6.0 Amp - 400V
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 89-2-8
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 203000, 203200, 2770
96-24-6
11/18/96
WIRING - ELECTRICAL DIODE IDENTIFICATION AND SERVICE REPLACEMENTS
FORD:
1984-86 LTD
1984-88 EXP
1984-94 TEMPO
1984-97 CROWN VICTORIA, ESCORT, MUSTANG, THUNDERBIRD
1986-97 TAURUS
1989-97 PROBE
1994-97 ASPIRE
1995-97 CONTOUR
LINCOLN-MERCURY:
1984-86 MARQUIS
1984-87 LYNX
1984-92 MARK VII
1984-94 TOPAZ
1984-97 CONTINENTAL, COUGAR, GRAND MARQUIS, TOWN CAR
1986-97 SABLE
1987-89 TRACER
1991-94 CAPRI
1991-97 TRACER
1995-97 MYSTIQUE
MERKUR:
1985-89 XR4TI
1988-90 SCORPIO
LIGHT TRUCK:
1983-97 RANGER
1984-90 BRONCO II
1984-97 ECONOLINE, F-150-350 SERIES
1986-97 AEROSTAR
1991-97 EXPLORER
1995-97 WINDSTAR
MEDIUM/HEAVY TRUCK:
1984-91 C SERIES, CL-CLT-9000 SERIES
1984-97 F & B SERIES, L SERIES
1986-97 CARGO SERIES
1996-97 AEROMAX, LOUISVILLE
This TSB article is being republished in its entirety to update the applicable model years.
ISSUE:
Electrical system concerns that are due to diode failure may be serviced with an approved Ford service diode. Some electrical diodes used in early production vehicles are color coded for the purpose of size identification while others are stamped with a manufacture number. All Ford service diodes and current production diodes are identified by manufacture number.
ACTION:
If service is required, refer to the appropriate model/year Electrical and Vacuum Troubleshooting Manual (EVTM) to determine the size and location of the diode(s). Refer to the following Electrical Diode Application Chart for the correct service part number.
NOTE:
IF THE DIODE REQUIRING REPLACEMENT DOES NOT HAVE THE SAME RATING AS LISTED IN THE APPLICATION CHART, USE THE NEXT HIGHER RATED DIODE.
ELECTRICAL DIODE APPLICATION CHART
PART NUMBER PART NAME
E8DZ-10C912-A Diode - 1.0 Amp - 400V
E8DZ-10C912-B Diode - 6.0 Amp - 400V
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 89-2-8
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 203000, 203200, 2770
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.