Packard Forum Index » Pre-War (1899-1942)

After recieving my ‘41 180 back from the shop for accident repairs, I found that the head lights, parking lights, trunk light and rear turn signal lights are not working. I do have front turn signals. Not sure if I have brake lights as I was alone when I discovered this lighting issue and had no good way to check brake lights. When I spoke to the shop that had done the repair from the accident I was told that they were all working when the car left the shop and was returned to me. I trust them to be telling me the truth. They indicated all the wiring for the lighting goes through the panel headlight switch. They suggested I spray some WD40 on the sliding switch rod and try working that. The last time I was at the car, I was tight on time but did try it but the problem was not solved. Any thoughts? They also said that the light switch may just be worn out at this point. Is there a fuse or circuit breaker I should be looking for? I am horrible with electrical issues so any input you can provide as to what and where to check, in a dumbed down form, will be appreciated.

There are 1 or 2 20amp glass fuses on the bottom side of the light switch closest to the firewall. With the light switch off, you can pop them out with a finger or plastic fuse puller.
If you have a multimeter, you can check for continuity between the ends of each fuse without pulling them. I wouldn’t advise spraying WD 40 on the switch, esp since they worked before.

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If they removed the front fender or clip check for any loose, damaged or disconnected wires at the dimmer switch and the headlight terminal junction block on the left fender. Parking lights and headlights are connected to their feed wires at that block. In addition to the fuses Joe mentions, there is a built in circuit breaker on the head light sw which Packard calls a thermostatic relay in their writings. That protects the headlight, parking, instruments, and with possibly the addition of a second inline fuse in series, the tail, license plate and trunk lights. From the headlight switch, parking lights are powered via a wire directly going to the fender junction block. Headlights are powered thru the dimmer switch first and then to the junction block. Tail and trunk light feed is from the headlight switch via a wire which goes to the instrument light switch. Some early cars did not have any fuse, others had an inline fuse before the instrument light switch and still others had the inline fuse on the wire going to the rear of the car. If you have a voltmeter you might check power in and then turn the switch on and check the wires out to be sure the switch is working.

If you have the factory turn signals there should be a couple of 3 or 4 way inline connectors under the dash and since the fronts work, it is possible the rear turn signal wiring has been left disconnected. If you have aftermarket signals then because there were so many brands offered it is anyone's guess as to how they are connected unless you happen to have the diagram for your particular system. In the factory system brakes shared a dual filament bulb with the tail lights and the rear turn signals had separate turn signal only bulbs. In many aftermarket systems some were like modern systems and used the same bulb filament as the brakes. In those systems the stop light wire goes thru their turn signal switch first so it could be split and power each side bulb separately. If you have an aftermarket setup, with rear brakes and turn signals not working I would look for a disconnection in that wiring.

Here is an illustration of the headlight sw showing terminals. The 40 switch is the one with wire labels but I didn't check to see if colors are the same in 41. Since you have a 180, in 41 while the basic switch is electrically the same they added an extra resistor and terminal to the switch for dimming the OD active light for the cars which have overdrive. The circuit breaker or thermostatic relay is a large flat metal bar on top of the switch with a set of contacts at one end.

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