13 Years Available
Dodge Diplomat Light Bulb Sizes
Complete bulb size reference for the Dodge Diplomat from 1977 to 1989. Find headlight, fog light, turn signal, and brake light bulb sizes for every model year.
Every Dodge diplomat from 1977 to 1989 uses the same H4656 low beam bulb — once you confirm your year is within this range, you only need one part number.
Year Range
1977 – 1989
13 model yearsBulb Sizes Across Years
| Position | Bulb Type(s) | Years | Status |
|---|---|---|---|
| Low Beam | H4656(1977–1989) | 13 years | Consistent |
| Side Marker | 168(1977–1989) | 13 years | Consistent |
| High Beam | H4651(1977–1989) | 13 years | Consistent |
| License Plate | 168(1977–1989) | 13 years | Consistent |
| Brake Light | 1157(1977–1989) 921(1987–1988) 1156(1986–1986) | 13 years | Changed |
| Turn Signal Rear | 1157(1977–1989) | 13 years | Consistent |
| Tail Light | 1157(1977–1989) | 13 years | Consistent |
| Reverse Light | 1156(1977–1989) | 13 years | Consistent |
| Map Light | 912(1981–1989) | 9 years | Consistent |
| Dome Light | 912(1981–1983) | 2 years | Consistent |
| Turn Signal Front | 1157A(1977–1981) | 5 years | Consistent |
| Parking Light | 1157A(1977–1981) | 5 years | Consistent |
Common Diplomat Replacement Parts
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Frequently Asked Questions
We have bulb size data for the Dodge Diplomat from 1977 to 1989, covering 13 model years. Select your year below for a complete position-by-position bulb chart.
No, the Dodge Diplomat has used the H4656 low beam bulb consistently across all 13 model years in our database. Any year in the 1977–1989 range uses the same bulb.
The Dodge Diplomat uses a H4656 bulb for the low beam and a H4651 for the high beam. Select your year below for the exact fitment chart.
Yes. The Dodge Diplomat uses a H4656 low beam, and direct-fit LED conversion kits for that size are widely available. LED upgrades typically produce 2–3× more light output than stock halogen and last 25,000+ hours. Look for a DOT-compliant kit with a proper beam cutoff pattern.
Select your model year from the list below. Each year page shows every bulb position — low beam, high beam, fog light, turn signal, and brake light — with the correct size and a link to buy it on Amazon.