Re: 1942 "160" turn signal & brake wiring problem??
Posted by HH56 On 2021/6/5 13:33:27
To have the brake light and turn signal share the same filament there needs to be some way of interrupting the constant brake light feed to the side that is flashing. Without doing that the flashing could not be seen since the constant brake light on voltage would override the flash and keep the light lit.
Prior to the 23rd series Packard did not offer that feature. Brake and tail lights used a single bulb with the bright filament being for brakes. They chose to use a simple 3 wire turn signal switch that could only direct the turn signal flash to a side and light both bulbs at once. Since brakes already were at the rear bulb powering the bright filament that meant a separate bulb was needed in the rear for the signals. With the introduction of the 23d series 49s they went to a turn signal switch with 6 wires that was capable of connecting the 4 turn signal filaments independently as well as interrupting and directing the brake light signal to the side opposite the bulb needed for flashing. With that switch change they were able to use the same rear bulb filament for both functions.
The factory 42 diagram is a bit lame and leads to confusion in that it only shows 3 wires going into the single rear housing. The A.E.A diagram that can be downloaded from the PAC site does show the two bulbs in the rear housing but the print quality is rather poor in trying to read the wire color labels.
For clarification of the difference in turn signal circuits and switches here is the 49 to 56 extracted diagram. You can compare it to the prewar to 46-7 circuit. With the exception of 48s having only a single dash indicator light, those models also had the same basic 3 wire turn signal switch so needed the separate rear bulb as used in the earlier years.
Attach file:
49-56 Turn Signal Extraction2.jpg (239.76 KB)
Prior to the 23rd series Packard did not offer that feature. Brake and tail lights used a single bulb with the bright filament being for brakes. They chose to use a simple 3 wire turn signal switch that could only direct the turn signal flash to a side and light both bulbs at once. Since brakes already were at the rear bulb powering the bright filament that meant a separate bulb was needed in the rear for the signals. With the introduction of the 23d series 49s they went to a turn signal switch with 6 wires that was capable of connecting the 4 turn signal filaments independently as well as interrupting and directing the brake light signal to the side opposite the bulb needed for flashing. With that switch change they were able to use the same rear bulb filament for both functions.
The factory 42 diagram is a bit lame and leads to confusion in that it only shows 3 wires going into the single rear housing. The A.E.A diagram that can be downloaded from the PAC site does show the two bulbs in the rear housing but the print quality is rather poor in trying to read the wire color labels.
For clarification of the difference in turn signal circuits and switches here is the 49 to 56 extracted diagram. You can compare it to the prewar to 46-7 circuit. With the exception of 48s having only a single dash indicator light, those models also had the same basic 3 wire turn signal switch so needed the separate rear bulb as used in the earlier years.
Attach file:
49-56 Turn Signal Extraction2.jpg (239.76 KB)
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