While working on my headlamps, I may have inadvertently damaged my headlamp switch by shorting two wires...The cardboard insulator broke in half while trying to press together the original headlamp connectors...@#$!$ Even though the 30 AMP fuse is Ok, the lights won't come on now... While searching for a replacement, is the correct # 1994017 or 1994007? Thank you...
Thank you very much for the clarification, now I go in search of... Should this switch if found new come with the resistor, GM 817911? Which is probably burnt on mine now... Another question I have is the fuse... Mine is set up with a 30 amp, wonder if it is correct...
Interesting how the "replacing" number has nothing to do with the original switch...[img]http://[/img][img]http://[/img]
I understand, so in theory the superseded number (middle photo) could be used if you figure out the wiring... As for other numbers, there is also a GM 1994017 that is identical to the GM 1994007 which is a one year only switch as pointed out by Mike B... Do you know the exact application of GM 1994017? or is that also a revised number to the original GM 1994007?
Your headlight switch is set up for a voltage cutout, not a voltage regulator. Which do you have? There are four positions on that switch; position 1- off; position 2 for when you have a current draw such as heater and/or radio; position 3-parking lights; position 4 headlights. The more modern switch, of course, does not have that same position 2. And yes, the resistor shown is part of the headlight switch and integral with the voltage cutout system.
Are you sure your switch and resistor are damaged?
My '37 truck came with a 25 amp fuse in it, so your 30 amp fuse should be OK.
You're correct... My truck does not have a voltage regulator and the switch works the way you describe...The resistor is blown out. It happened when I was working with the original headlamp connectors. The insulating gasket split in half causing a short which blew the resistor. If you knew the thickness and type of wire used I suppose it may be repaired?
Still trying to confirm if GM 1994007 is the same as GM 1994017 though...They appear to be identical in every respect.
I can't find anywhere were 1994007 and 1994017 / 1995040 paths ever crossed, so there must be something different between the two. It could be the knob shaft length or the mounting hole diameter in the dash or wiring or ???, but 1994017 /1995040 is not listed for 1939 applications that I can find.
1994017 /1995040 became the "universal" replacement switch for the pre-1939 cars and trucks...
Very interesting indeed, since 1994007 and 1994017 are identical switches... Please see photos. Maybe the differences are any of the possibilities you mention? Still 1994017 and and 1995040 are completely different switches altogether... Can be confusing.