Light Bulb Reference Guide for 1966 Mustang – included part number, quantity and link to purchase part from MustangParts.AverageJoeRestoration.com
Exterior Bulbs
| Year | Description/Location | Mfg Bulb Part # | Qty |
| 1966 | Tail/Brake Lamps | 1157 | 2 |
| 1966 | Backup Lights (in Rear Valance) | 1142 | 2 |
| 1966 | Front Parking Lamps (in Valance) | 1157 | 2 |
| 1966 | License Plate Lamp | 97 | 1 |
Signal Flasher Relays
| Year | Description | Mfg Part # |
| 1966 | Turn Signal Flasher Relay (2 pin Type) | SF-224 |
| 1966 | Emergency “Hazard” Flasher (2 Pin Type) | SF-552-B |
Interior Bulbs
| Year | Description/Location | Mfg Bulb Part # | Qty |
| 1966 | Courtesy Lamps – Under Dash | 631 | 2 |
| 1966 | Glove Box Lamp (Dash) | 1895 | 1 |
| 1966 | Glove Box Lamp (Console) | 1445 or 1895 | 1 |
| 1966 | Door Mounted Courtesy Lights | 1004 | 2 |
| 1966 | Quarter Pillar Courtesy Lamps (Fastback) | 1003 | 2 |
| 1966 | Console Rear Courtesy Lamps | 1816 | 2 |
| 1966 | Seatbelt Warning Lamp (Dash Mount) | 1895 | 1 |
| 1966 | Cigarette Lighter | 1895 | 1 |
| 1966 | Brake Warning Lamp | 257 | 1 |
Interior Bulbs
| Year | Description/Location | Mfg Bulb Part # | Qty |
| 1966 | Shifter Illumination Lamp (Auto Only) | 1893 or 1445 | 1 |
| 1966 | Rally Pak Gauge Lamps | 1816 or 1895 | 2 |
| 1966 | Radio Dial Lamp | 1893 | 1 |
Instrument Cluster
| Year | Description/Location | Mfg Bulb Part # |
| 1966 | Instrument Panel Lights | 1895 |
| 1966 | Turn Signal Indicator | 1895 |
| 1966 | Warning – Oil, Alternator, Brakes | 1895 |
| 1966 | Bright Indicator | 1895 |