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Technical: Lamps
Dave Hennessey

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Bulb Chart for 1952 to 1969 K Models and XL Models [1]
Description 1952-1956 K, KH
1957-1958 XL, XLH
1959-1964 XLH, XLCH 1965-1969 XLH, XLCH (12 V)
C.P. / Watts Harley-Davidson C.P. / Watts Harley-Davidson C.P. / Watts Harley-Davidson
Headlamp Hi/Low 30 / 30 Watts 67717-48 45 / 35 Watts [2] 67717-59 50 / 40 Watts 67717-64
Tail / Stop 3 / 21 C.P. 68165-47 3 / 21 C.P. 68165-47 4 C.P. / 32 C.P. 68165-64
Generator Signal Light [3] 2 C.P. 68462-49 3 C.P. 71090-59 4 C.P. 71090-65
Oil Signal Light [3] 2 C.P. 68462-49 3 C.P. 71090-59 4 C.P. 71090-65
Speedometer Lamp [3] 1.5 C.P. (.25 amp) 71090-47 1.5 C.P. 71090-47 2 C.P. 68462-64
Spot Lamp (Bulb Type) 32 C.P. 68715-49 32 C.P. 68715-49 32 C.P. 68715-64
Spot Lamp (Sealed Beam)   —   — 30 Watts 68726-62 30 Watts 68726-64
Parking Lamp 3 C.P. 68165-15 3 C.P. 68165-15 3 C.P. 68166-64
Fender Lights 2 C.P. 68462-49   —   —   —   —
Turn Indicator Lamp 21 C.P. 68572-50 21 C.P. 68572-50 32 C.P. 68572-64(A)
Turn Indicator Pilot Lamp [3] 1 C.P. 68561-50 1 C.P. 71090-47 1.5 C.P. 71090-64

[1] This chart was compiled from section 5D of the 1959, 1966 and 1969 Service Manuals, which lists the bulbs used for all H-D models.
[2] The 1959 Service Manual shows 40/35, but the 1966 and 1969 Manuals show 45/35.
[3] The C.P. rating of these dashboard lamps does not seem realistic. They have similar C.P. ratings to a tail lamp. Tail lamps need to be seen 100 feet away. Dashboard lamps need to be seen only one foot away.

 

Finding the trade number of the bulb is sometimes easy - if we can find a NOS package, or by finding an existing original bulb on an original bike. But sometimes we have to try and match an existing, available, trade number to the Harley specs. To do this, we're gonna have to learn something about light bulbs.

Voltage is pretty easy - most bulbs are rated at a slighly higher value, like 6.4, than the nominal 6 or 12 volts. Amperage, the amount of current the bulb draws, is seldom given anywhere but in formal specifications. Wattage (volts x amps) is the usual specification. Candlepower is an ancient term that hasn't been used in 50 years, but our Harley books still use it. Base is a description of how the bulb mounts in its socket. Glass is the shape of the glass envelope. And Filament is a description of how the tungsten "heating element" is constructed.

 

6 Volt Bulbs
Harley # Trade # Volt Amps Watts C.P. Base Glass Filament Notes
67717-48 6006 6.4 7.81 / 6.25 50 / 40  — G16t PAR56 C6 / C6 Replacement? Original was 30/30 watts
67717-59 4031 6.4 7.03 / 5.47 45 / 35  — G16t PAR46 C6 / C6 Possible Original.
4020 6.4 4.69 / 4.69 30 / 30  — G16t PAR46 C6 / C6 Replacement? Original was 45/35 or 40/35
68165-15 63               Believed Original.
68165-47 1154 6.4 2.59 / .83 16.6 / 5.3 21 / 3 BAY15d S8 C6 / C6 Believed Original. Note: Indexed pins.
68462-49 55 7 .41 2.87 .16 BA9s G4-1/2 C2R Believed Original.
68561-50                  
68572-50                  
68715-49                  
68726-62                  
71090-47 44 6.3 .25 1.58 0.9 BA9s T3-1/4 C2R Believed Original.
71090-59                  
12 Volt Bulbs
Harley # Trade # Volt Amps Watts C.P. Base Glass Filament Notes
67717-64                  
68165-64 1034 12.8/14 1.8 / .593 23 / 8.3 32 / 4 BAY15d S8 C6 / C6 Believed Original. Note: Indexed Pins.
68166-64                  
68462-64 57 14 .24 3.36 .16 BA9s G4-1/2 C2V Possible Original.
68572-64(A)                  
68715-64                  
68726-64                  
71090-64 1815 14 .2 2.8 .11 BA9s T3-1/4 C2V Possible Original.
Weirdo Oldies
Harley # Trade # Volt Amps Watts C.P. Base Glass Filament Notes
 — 51 7.5 .22 1.65 BA9s G3-1/2 C2R
 — 53 14.4 0.12 1.73   BA9s G3-1/2 C2V  
 — 1158 6.4 / 7 2.63 / 0.75 17 / 5 21 / 3 BA15d S8 C6 / C6 Straight-across pins
 — 1133 6.2 3.91 24.2 32 BA15s RP11 C2R Straight-across pins
 — 1503 5.9 6.53 38.5 50 P15s30B RP11 C2V  
 — 2530 5.9 / 6.2 6.53 / 4.23 38.5 / 26.2 4 P15d30A RP11 C2V / C2V  
 — 2331 5.9 / 6.2 4.66 / 4.69 27.5/29.1 32/32 P15d30S RP11 C6 / C6  
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