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Shade Tree Mechanic
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OP
Shade Tree Mechanic
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Where is the location of the Stop Light Switch on a 1940 Sedan?
Thanks, Wes
six volts forever
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Joined: Jan 2006
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Hall Monitor ChatMaster - 7,000
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Hall Monitor ChatMaster - 7,000
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It's on the back of the master cylinder on my 38.
VCCA Member 43216
Save a life, adopt a senior shelter pet.
1938 HB Business Coupe
1953 210 Sedan
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Joined: Apr 2004
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Shade Tree Mechanic
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Shade Tree Mechanic
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Thanks Tiny - There it is, I was looking around the brake pedal, looks like the horn may be getting power from there also.
Wes
six volts forever
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ChatMaster - 25,000
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ChatMaster - 25,000
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The stop light switch gets power from a terminal on the light switch that is live at all times. The horn relay gets power from a wire that runs from the starter (positive battery cable connection) to the ammmeter. This wire is of a larger gauge as the horn has a high amp draw.
Gene Schneider
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Joined: Apr 2004
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Shade Tree Mechanic
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Shade Tree Mechanic
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Chevgene, The reason I said it looks like it goes to the horn buton is that there are (3) wires on the stop light switch, (2) of which look like original wire and one somewhat new that goes up the steering column, I will have to check it out when I wire up the turn signals, which may be a challenge as I'm not really clear on the stop light wiring arrangement for the turn signals yet..........
Wes
six volts forever
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Joined: Jul 2006
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Backyard Mechanic
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Backyard Mechanic
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If its "add on" turn signals that share the stoplight filiment in the rear bulb, then the stoplight current from the switch will go to the turn signal switch where it can be interupted if the corresponding turn signal has been applied.
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Joined: Jan 2002
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ChatMaster - 25,000
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ChatMaster - 25,000
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The wire that goes into the steering mast jacket is a gouund wire. When you depress the horn you are just grounding the circuit. Just something to keep in mind.
Gene Schneider
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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I may have missed it, but when you add turn signals you use the one wire that goes to the back of the car for the LR stop signal. Then it is necessary to run an additional wire from the RR back to one of the wires on the turn signal switch.  
RAY Chevradioman http://www.vccacolumbiariverregion.org/1925 Superior K Roadster 1928 Convertible, Sport, Cabriolet 1933 Eagle, Coupe 1941 Master Deluxe 5-Passenger Coupe 1950 Styleline Deluxe 4-Door Sedan 1950 Styleline Deluxe Convertible 2002 Pontiac, Montana, Passenger Van 2014 Impala, 4-Door Sedan, White Diamond, LTZ 2017 Silverado, Double Cab, Z71, 4X4, White, Standard Bed, LTZ If you need a shoulder to cry on, pull off to the side of the road. Death is the number 1 killer in the world.
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Joined: Jul 2006
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Backyard Mechanic
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Backyard Mechanic
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That would be correct. Each rear stoplight/turn signal(left and right) must have its own wire coming from the turn signal switch. The turn signal switch will also have 2 wires going to the front turn signals(1 to each side) and a feed wire from a switched hot and a feed from the switched side of the stoplight switch. Should be a total of 6 wires to the turn signal switch. If this is not correct for early systems I expect to be corrected. 
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Joined: Apr 2004
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Shade Tree Mechanic
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Shade Tree Mechanic
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Thanks guys, I will be hooking up my new turn signals shortly and if I have a problem you'll be hearing from me.
Thanks lots, Wes Marquis
six volts forever
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Oil Can Mechanic
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Oil Can Mechanic
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wes, it is possible that the wire going up the mast is hooked up wrong, that wire should be a ground wire unless the previous owner hooked up a side mount horn button on the column. i found on the car i bought, the previous owner had rigged and bypassed the wiring. so i had a fun time troubleshooting the electrics. it might be something you might take a look at closer to avoid a short. just a thought..kw
Ken's 1940 Special Deluxe Sedan
1970 Cadillac Hearse
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