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Old 08-23-2019, 05:52 PM   #1
coolcoupe
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Default heater wiring

Have a 47 car and was wondering where the best way to place to get power to my heater ? Do I just get power from the ignition switch or from some other source ?
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Old 08-23-2019, 06:42 PM   #2
FortyNiner
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Default Re: heater wiring

These may help.
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File Type: jpg 1945 Heater inst instructions 02sm.jpg (85.7 KB, 54 views)
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File Type: pdf 1940 Ford Heater Installation.pdf (789.9 KB, 24 views)
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Old 08-23-2019, 08:46 PM   #3
alanwoodieman
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Default Re: heater wiring

do not take the power off the "coil" side of the ign switch. I went back to the circuit breaker under the dash and then routed it thru a fuse to the heater
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Old 08-24-2019, 12:18 AM   #4
coolcoupe
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Default Re: heater wiring

With the switch turn on, would that make the heater only work when the ignition is in the on position or on all the time ?
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Old 08-24-2019, 07:51 AM   #5
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Default Re: heater wiring

THANK YOU Forty Niner!!!!!!!!!!!!!! Included in that batch of information is the elusive code for wiring a 46-8 heater switch which a lot of us have been looking for.
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Old 08-24-2019, 12:46 PM   #6
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Default Re: heater wiring

Glad to be of assistance.
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Old 08-24-2019, 01:46 PM   #7
19Fordy
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Default Re: heater wiring

Not trying to be redundant but, here's more info.
https://www.earlyfordv8.org/forum/pr...=18&Topic=1692

Will the posting #10 help?
https://www.fordbarn.com/forum/showt...ht=wire+heater

Last edited by 19Fordy; 08-24-2019 at 01:52 PM.
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Old 08-24-2019, 07:48 PM   #8
coolcoupe
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Default Re: heater wiring

Any problems with the power being hook up to the ignition switch ?
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Old 08-24-2019, 09:13 PM   #9
JSeery
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Default Re: heater wiring

Heater and fans are high current users, why would you want to attempt to connect them to the ignition switch? The ignition switch is not designed to handle high current loads.
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Old 08-25-2019, 06:08 PM   #10
coolcoupe
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Default Re: heater wiring

Thank you, JSeery thats what I was looking for. Moe
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Old 08-25-2019, 06:54 PM   #11
coolcoupe
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Default Re: heater wiring

Just had a thought, how would you hook it up if a person wanted the heater to only work when the ignition was on ?
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Old 08-25-2019, 06:56 PM   #12
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Default Re: heater wiring

Quote:
Originally Posted by coolcoupe View Post
Just had a thought, how would you hook it up if a person wanted the heater to only work when the ignition was on ?
Relays, just like a fuel pump or something. Relays are handy little things for this type of stuff. Use a wire from the ignition switch as the trigger wire.
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Old 08-25-2019, 07:05 PM   #13
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Default Re: heater wiring

Here are the 1945 instructions, see the paragraph on switch connections. It tells you to connect to the red and black wire on the fuse block so the heater will only go when ignition is on. If you need this in higher resolution send me your email address and I can email it to you.

Hope this helps?
Attached Images
File Type: jpg 1945 Heater inst instructions 01sm.jpg (93.5 KB, 10 views)
File Type: jpg 1945 Heater inst instructions 02sm.jpg (99.8 KB, 8 views)
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Last edited by meric42; 08-25-2019 at 08:30 PM. Reason: Spelling
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Old 08-25-2019, 07:51 PM   #14
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Default Re: heater wiring

It sure does say that!! The Red/Black wire is the wire from the ignition switch to the resistor on the fuse panel. I don't think that is a good idea at all!!! But, this is what the instructions say.

They say to connect to the Red/Black wire on the ignition switch for the Ford and to the fuse panel on the Merc.

Last edited by JSeery; 08-25-2019 at 07:59 PM.
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