47-55.1 Recommended Electronic Voltage Reducer 12 Volt To 6 Volt - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pvienneau · 07-21-2022, 08:38 AM

Hello all, decided to do a 12 Volt conversion on the 49 3100. I have the big items for project (12 Volt gen, 12 Volt batt, ballast res.,12 volt coil) but curious about voltage reducers. What reducers did others use or recommend to use? I have a heater, flashers, and want to keep the original gauge cluster. Any help is appreciated.

_Ogre · 07-21-2022, 11:58 PM

Speedo, oil pressure and temperature are mechanical and needs no conversion
Gas gauge needs to be addressed, Google it or someone will chime in
Amp meter should be bypassed or converted into a volt gauge,
I did a gauge conversion write up in my thread
Flasher, install a 12v flasher and all light bulbs
All switches are good, will draw half the power on 12v
Starter motor won't handle extended cranking time, treat it nice and it will last years
The only thing left is the heater blower motor, buy a 12v motor

_Ogre · 07-22-2022, 12:02 AM

PS: a coil is a coil, the ballast resistor drops 12v to 6v in the run position

pvienneau · 07-26-2022, 12:03 PM

Thanks Ogre

**mr48chev** · 07-27-2022, 04:36 AM

There is a style of reducer called a Runtz reducer that is designed for gauges
https://vintageautogarage.com/12-vol...r-made-in-usa/ You can also order from these guys through Amazon if you prefer. https://www.amazon.com/Gauge-Reducer...56275261&psc=1
Most of the places associated with vintage cars and trucks sell them though. One for each gauge but you only have one gauge that needs one.

07-21-2022, 08:38 AM	#1
pvienneau Registered User Join Date: Aug 2011 Location: Boston, MA Posts: 695	Recommended Electronic Voltage Reducer 12 Volt To 6 Volt Hello all, decided to do a 12 Volt conversion on the 49 3100. I have the big items for project (12 Volt gen, 12 Volt batt, ballast res.,12 volt coil) but curious about voltage reducers. What reducers did others use or recommend to use? I have a heater, flashers, and want to keep the original gauge cluster. Any help is appreciated. __________________ Pat 1949 unmolested Indy Farm Deluxe AD 1949 Standard 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=581544

07-21-2022, 11:58 PM	#2
_Ogre Registered User Join Date: Jan 2012 Location: Motown Posts: 7,680	Re: Recommended Electronic Voltage Reducer 12 Volt To 6 Volt Speedo, oil pressure and temperature are mechanical and needs no conversion Gas gauge needs to be addressed, Google it or someone will chime in Amp meter should be bypassed or converted into a volt gauge, I did a gauge conversion write up in my thread Flasher, install a 12v flasher and all light bulbs All switches are good, will draw half the power on 12v Starter motor won't handle extended cranking time, treat it nice and it will last years The only thing left is the heater blower motor, buy a 12v motor __________________ cool, an ogre smiley Ogre's 58 Truk build how to put your truck year and build thread into your signature shop air compressor timer

07-22-2022, 12:02 AM	#3
_Ogre Registered User Join Date: Jan 2012 Location: Motown Posts: 7,680	Re: Recommended Electronic Voltage Reducer 12 Volt To 6 Volt PS: a coil is a coil, the ballast resistor drops 12v to 6v in the run position __________________ cool, an ogre smiley Ogre's 58 Truk build how to put your truck year and build thread into your signature shop air compressor timer

07-26-2022, 12:03 PM	#4
pvienneau Registered User Join Date: Aug 2011 Location: Boston, MA Posts: 695	Re: Recommended Electronic Voltage Reducer 12 Volt To 6 Volt Thanks Ogre __________________ Pat 1949 unmolested Indy Farm Deluxe AD 1949 Standard 4 speed http://67-72chevytrucks.com/vboard/s...d.php?t=581544

07-27-2022, 04:36 AM	#5
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,710	Re: Recommended Electronic Voltage Reducer 12 Volt To 6 Volt There is a style of reducer called a Runtz reducer that is designed for gauges https://vintageautogarage.com/12-vol...r-made-in-usa/ You can also order from these guys through Amazon if you prefer. https://www.amazon.com/Gauge-Reducer...56275261&psc=1 Most of the places associated with vintage cars and trucks sell them though. One for each gauge but you only have one gauge that needs one. __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.



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