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12 Volt Conversion #1289170
Thu Nov 29 2018 03:13 AM
Thu Nov 29 2018 03:13 AM
K
kclark2227  Offline OP
New Guy
Joined: Oct 2018
Posts: 21
Kannapolis, NC
I have read several articles about 12 volt conversion. I will need to do this to add a 7 way plug to utilize my trailer's electric brakes. Those of you that have converted, did you buy a conversion "kit" or did you do better buying the individual items and make your own "kit".

Re: 12 Volt Conversion [Re: kclark2227] #1289171
Thu Nov 29 2018 03:17 AM
Thu Nov 29 2018 03:17 AM
G
Grigg  Offline
Master Gabster
Joined: May 2005
Posts: 8,676
Lexington, VA
What year?
Up to 50’s can be as simple as new light bulbs, an alternator, and resistor each for coil and fuel gauge.
Later might be more complicated but I doubt by much, I’m just not familiar with the newer trucks.


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: 12 Volt Conversion [Re: kclark2227] #1289227
Thu Nov 29 2018 03:51 PM
Thu Nov 29 2018 03:51 PM
W
Wrenchbender Ret.  Offline
Master Gabster
Joined: Jun 2004
Posts: 7,908
Lenexa Ks.
You pretty well nailed it Grigg. Anything mid 50's on up is all ready 12 volts. He will probably use a 12 volt radio. Put a resister on the heater circuit or a 12 volt blower motor. I have run 6 volt heaters on 12 volts.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1956 Chevy 1/2-Ton Pickup

Re: 12 Volt Conversion [Re: kclark2227] #1289228
Thu Nov 29 2018 04:02 PM
Thu Nov 29 2018 04:02 PM
G
Grigg  Offline
Master Gabster
Joined: May 2005
Posts: 8,676
Lexington, VA
I forgot about the heater. New 12 v motors are generally available for about 30-$40 at local auto parts store.
Search in electrical forum for details on that.

In my experience the 6V starter will be just fine and dandy, and crank with authority on 12V
https://www.stovebolt.com/ubbthread...7279/Easy/cheap_heater_blower_motor.html

Last edited by Grigg; Thu Nov 29 2018 05:46 PM. Reason: add link

1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Re: 12 Volt Conversion [Re: kclark2227] #1290133
Fri Dec 07 2018 12:08 AM
Fri Dec 07 2018 12:08 AM
truckernix  Offline
Master Gabster
Joined: Mar 2002
Posts: 8,697
Bracebridge Ontario Canada
I converted my 51 to 12 volts. I used a 12 volt generator and regulator, resistors for the heater motor and another type for the the gas gauge. I used a 12 volt coil that does not require a resistor, as marked on the side of it. The heater resistor is 1 ohm 50 watts and the gas gauge resistor is 30 ohms 2 watt.

I used a reflector type headlight that uses an H4 bulb. They are very bright with a modern type pattern. They look almost identical to a sealed beam unit.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!

Moderated by  69Cuda, Grigg 

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