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New install 12 v radio into 6 volt truck help please
#1354588 Sat Apr 11 2020 07:03 PM
Joined: Jul 2019
Posts: 42
R
Rubidu8 Offline OP
Wrench Fetcher
I’m installing a new 12 v radio Into my 47 Chevy 3800. I have the 6 v to 12 v converter. Couple of questions: first, it calls for one connection to be to a switched 12v source and another to a constant 12 v source. Typically the switched source would be the ignition switch which of course on this truck is the original 6 volt. Do I need to add a switch on the dash for this 12 volt source, or is there a way around it?
Question 2: does the on/off switch on the radio not serve the same purpose as this switched source? In other words, can I just hook up the radio to constant 12 volt and turn it off and on at the radio? Or does this delete the memory function every time I turn it on and off? Thanks much for any advice! David

Re: New install 12 v radio into 6 volt truck help please
Rubidu8 #1354592 Sat Apr 11 2020 07:10 PM
Joined: Jun 2011
Posts: 3,548
E
Shop Shark
6 volt accessories draw twice the current than 12 volt accessories, so no need to upgrade when going to 12 v.

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: New install 12 v radio into 6 volt truck help please
Rubidu8 #1354594 Sat Apr 11 2020 07:16 PM
Joined: Apr 2005
Posts: 8,791
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
You will lose the memory every time you turn it off.🛠


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2)
‘39 Dodge Businessmans Coupe
USAF 1965-69 Weather Observation Tech (got paid to look at the clouds)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!

Re: New install 12 v radio into 6 volt truck help please
Rubidu8 #1354604 Sat Apr 11 2020 07:57 PM
Joined: Apr 2008
Posts: 785
F
Shop Shark
Might have better info posting in the "radio bench" forum


Ed
Re: New install 12 v radio into 6 volt truck help please
Rubidu8 #1354775 Sun Apr 12 2020 04:12 PM
Joined: May 2005
Posts: 1,636
B
Shop Shark
The reason for the constant voltage is for memory. The switched voltage is there to turn the radio off when to go to the off position on your switched source (ignition switch). You can tie both voltage wires to the 12 source. Just remember to turn the radio off (knob) when you exit the truck.


Six volt guy living in a twelve volt world
Re: New install 12 v radio into 6 volt truck help please
Rubidu8 #1354805 Sun Apr 12 2020 06:02 PM
Joined: Jul 2000
Posts: 992
G
Shop Clutterist
You created two threads asking the same question. Not cool.


Gord
----
1954 1/2 ton 235 4 speed

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