1928 Plymouth 1937 Plymouth Plymouth: The First Decade

Light Bulbs

Unless otherwise noted, Chrysler part numbers are from [Chrysler 1959] and/or [NAPA 1937]. Design volts, amps, output and filament information is from [GE 1970].

[Chilton 1931 293] notes that:

“All numbers over 100 are for headlights.
All numbers from 61 to 94 are for auxiliary lights.
Even numbers indicate double contact (D.C)
Odd numbers indicate single contact (S.C.)”

Apparently a large number of bulbs that were originally designed for headlights were later destined to be used in dome light and brake light applications.

Typical Use Chrysler Mazda7 Number Bulb Base Design Volts CP or Watts Design Amps Filament
Indicator, Radio 187189 44 T-3 1/4 Min. Bay. 6.3 .90 C 0.25 C-2R
Auto instrument 115273 51 G-3 1/2 Min. Bay. 7.5 1 C 0.22 C-2R
Auto instrument 125588 55 G-4 1/2 Min. Bay. 7.0 2 C 0.41 C-2R
Dash, parking light 142303 63 G-6 SC Bay. 7.0 3 C 0.63 C-2R
Dome light 142306 81 G-6 SC Bay. 6.5 6 C 1.02 C-2R
Dome light 142304 87 S-8 SC Bay. 6.8 15 C 1.91 C-6
Dome light 142446 88 S-8 DC Bay. 6.8 15 C 1.91 C-6
Head light
Note 1
142307 1000 RP-11 DC Bay. 6-8 32 C
32 C
  C-2V
    1105 RP-11 SC Bay. 6.2 50 C 5.72 C-2V
Head light
Note 2
142305 1110   DC Bay. 6-8 21 C
21 C
   
Head light
Note 2
  1116 S-10 DC Bay. 6-8 21 C
32 C
  C-2V
Note 3 142308 1129 S-8 SC Bay. 6.4 21 C 2.63 C-6
    1133 RP-11 SC Bay. 6.2 32 C 3.91 C-2R
    1134 RP-11 DC Bay. 6.2 32 C 3.91 C-2R
Tail & brake light 145416 1154 S-8 DC Index 6.4
7.0
21 C
3 C
2.63
0.75
C-6
C-6
Tail & brake light 142449 1158 S-8 DC Bay. 6.4
7.0
21 C
3 C
2.63
0.75
C-6
C-6
Auto spotlight   1183 RP-11 SC Bay. 5.5 50 C 6.25 C-2V
Searchlight   1184 RP-11 DC Bay. 5.5 50 C 6.25 C-2V
Head light
Note 4
  1188 RP-11 DC Bay. 6.2
6.2
50 C
32 C
5.72
3.91
C-2V
Head light
Note 5
110183 2320 RP-11 DC Pref. 6.2
6.4
32 C
21 C
4.52
3.3
C-2V
Head light
Note 5
659530 2331 RP-11 DC Pref. 6 32 C (27 W)
32 C (27 W)
  C-6
Head light 854750 4030 PAR-56     40 W
30 W
   
Auto Spotlight 1253120 4515 PAR-36   6.4 30 W   C-6
Head light   6006 PAR-56   6.1
6.2
50 W
40 W
  C-6
C-6
Head light   6012 PAR-56   12.8
12.8
50 W
40 W
  C-6
C-6
Head light   6014 PAR-56   12.8
12.8
60 W
50 W
  C-6
C-6
Head light
Note 6
  H6024 PAR-56   12.0
12.0
60 W
40 W
5.02
3.34
 
Note 1
[Chrysler 1959] indicates that the 1000 bulb has a 32 CP rating. When sold in antique automotive swap meets these bulbs are often referred to as 50 CP bulbs. Several samples of the 1000 bulb and the original boxes they were delivered in clearly indicate that the bulb is 32cp/32cp. The filament type of the 1000 is based on examination of a sample bulb.
Note 2
Information from [Chilton 1931 293]. The 1116 bulb was listed as a 32cp replacement for the 21cp 1110 bulb. [NAPA 1937] shows the 1110 bulb to be a two filament bulb with each filament at 21cp. It also shows the 1116 to be a two filament bulb with 21cp and 32cp ratings. Photos of a boxy of 1116 bulbs provided by Jeff Machusak that confirms the 32cp/21cp rating and lists the bulb shape as S-10 (1-1/4 inch diameter spherical) while the photos show as slightly non-spherical shape but not the RP-11 shape of other era headlight bulbs. The photos clearly show the filaments as C-2V.
Note 3
[Chilton 1931 293] indicates that the 1133 bulb was a 32 CP replacement for the 21 CP 1129. This seems odd in that the bulb shape and filament are different. It is unlikely that the 1133 could have been properly focused in head lamps designed for the 1129 bulb.
Note 4
Data on the 1188 bulb is based on samples clearly marked “50-32C 6-8V” The filament type and bulb shape listed here are based on examination of sample bulbs. Design voltage and current draw based on that typical of other 32cp and 50cp bulbs intended for the same application
Note 5
Data from [NAPA 1937]
Note 6
Data from Internet Web searches. Not verified by printed source.
Note 7
Mazda was a trademark of General Electric and was selected based on the Persian god of light named Ahura Mazda.