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Joined: Aug 2005
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Grease Monkey
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Grease Monkey
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Where is the best place to pull power from, to power the original two speed defroster switch on my 1948 Chevy Fleetline Aero Sedan?
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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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Chevrolet did it from the ignition switch. The side of the switch that is hot only when the ignition is in the "on" position.
Gene Schneider
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Joined: Aug 2005
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Grease Monkey
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Grease Monkey
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Thanks for the help. I couldn't seem to find it on the wiring diagram in the service manual.
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That is because the radio, heater, defroster, etc. were dealer installed accessories and not mentioned in the shop manual.
Gene Schneider
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ChatMaster - 6,000
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Gene, I think you are right. Nevertheless, owing to the fact that the radio, heater and defroster, fog lights, and back-up light have an "off" position why not hook them up to the "hot" side of the ignition switch. Is it because you people up north not so smart and, thus, tend to forget that you turned those stinkin items on? Yep! I think that must be it.  Down here we only used the defroster to keep the windshild clear of fogging whilst at the drive-in with little Suzzie. When the picture show was over we always remembered to turn it off. Did too!  Charlie 
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Joined: Jan 2002
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That is exactly why they are not hooked to the hot side of the ignition switch. This makes it impossible to leave an accessory on and kill the battery.
Gene Schneider
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Joined: Nov 2008
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Backyard Mechanic
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Backyard Mechanic
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So I have to ask, how many of the accessories can be supplied from the switched side of the ignition switch. Thanks Mike
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Joined: Jan 2002
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As long as you use a flat eye type terminal any reasonable number that the screw will hold. The wire leading from the starter to the Ign. switch is 10 or 12 gauge so it can carry a lot of amps.
Gene Schneider
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Joined: Dec 2001
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Technical Advisor ChatMaster - 10,000
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Technical Advisor ChatMaster - 10,000
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The downside is the ignition switch. If the load is high it can put a strain on the switch and may destroy it. If you have several appliances to connect it may be advisable to set up a circuit using a relay. 
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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ChatMaster - 25,000
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While I agree 100% with the above it would be unusual to have all the accessoris on at once. On a collector car you will along with them.
Some things could be hooked to the always hot side of the switch, then nothing is going through the switch. Just remember to turn them OFF at the end of the ride.
Gene Schneider
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Joined: Nov 2008
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Backyard Mechanic
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Backyard Mechanic
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Is the switched terminal capable of handling the heater, defroster, radio and signal light load simultaneously?
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Joined: Jan 2002
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ChatMaster - 25,000
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That would be considered a standard load so yes it would handle it with ease. The six volt ignition switchs seldom gave any problems. The 12 volts were another story.
Gene Schneider
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Joined: Nov 2008
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Backyard Mechanic
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Backyard Mechanic
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Thanks Gene, I guess I'll move some wires around. No more wondering if I left the signal lights on!
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Might reconsider the turn signal switch if it has the hazard position. You would have to leave the key on to us them.
I have a battery disconnect on my 48 that I open when I put it in the garage.
1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
2019 Ford Ranger Lariat Super Crew
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Wouldn't you notice leaving some of these items on: a. Trun signals b. Back-up light c. hear the defroster or heater motors running Why not hook some of these items to the "on" (head and parking)side of the light switch. You would surely notice leaving the light on. The only thing I can see needs to be "on" when only the ignition switch is on is the ... well, I can't think of anything really. Can any of you and why? Maybe the back-up light. It may be easy to forget that. Charlie
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Joined: Sep 2009
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Let me add to my last comment. If hooked to the ignition switch and you happen to leave the acccessorits on when you turn off the engine, what will happen when you start the engine the next time? They will be on and the chance of you leaving them on is almost 100 percent. We must think this thing through and not assume that we are so stupid as to leave things on. That's the reason they have an on and off switch. As for me, I hook up every thing to the "hot" side of the ignition switch or a hot post on the light switch. Three things, I think, should always be on the hot side of the ignition switch: a. The cigar lighter b. The radio c. The electric winding clock e. Defroster and Heater switches The back-up liight should be on the ignition side. You don't need it if you're not going anywhere. Okay, you nay-sayers. Make you case or if you're a-packin, say when. Charlie
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Joined: Jan 2002
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The cigar lighter was NEVER hooked to the hot side.
Gene Schneider
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Shade Tree Mechanic
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Shade Tree Mechanic
Joined: Jan 2012
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Due to the lack of an accessory position on the ignition switch and to help reduce ignition noise, I believe most dealer installed radios were hot all the time from being connected to the amp gauge. Been a long time since we were at a drive-in but last time there were no speakers. The drive-in transmitted the soundtracks via a radio frequency. Now I guess they use WiFi 
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