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Re: Why upgrade to 12 volt? [Re: AaronW] #1298423 Mon Feb 11 2019 01:01 AM
Joined: Apr 2005
Posts: 7,545
Justhorsenround Offline
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
Have you read the Stovebolt Tech Tip on 12 volt conversion?


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)


"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" and lock up those on the wrong side of that line.

Re: Why upgrade to 12 volt? [Re: Justhorsenround] #1298430 Mon Feb 11 2019 01:26 AM
Joined: Oct 2018
Posts: 104
K
kclark2227 Offline
Shop Shark
Originally Posted by Justhorsenround
Have you read the Stovebolt Tech Tip on 12 volt conversion?


Yes sir I did. Didn't say anything about headlight relays. Kinda why I'm asking.

Re: Why upgrade to 12 volt? [Re: AaronW] #1298452 Mon Feb 11 2019 02:49 AM
Joined: Feb 2004
Posts: 18,845
H
Hotrod Lincoln Online
Boltergeist
Headlight relays have been in use since the 1940's so it's nothing new, and there's a very good reason to do so. Using them on 6V systems is particularly beneficial. Every time electric current passes through a switch or a connection, a tiny bit of voltage is consumed to push the electrons through the connection. It's called "voltage drop". That leaves slightly less voltage available to do the job once it gets to the headlights. Stack up 5 or 6 such connections from the battery, to the ammeter, to the light switch, to the dimmer switch, to a junction block, to the headlight filament, and then negotiate a similar ground path back to the battery. Auto makers are notorious for pinching pennies and using the smallest gauge wires they can get away with. It affects their bottom line when they're producing millions of vehicles a year, and their shareholders don't really care if you can actually see where you're going. You'll need to carry a flashlight to check if the headlight is actually burning.

Now- - - -run a HEAVY wire , like a #8 or so, from the battery cable at the starter to the radiator core support, and tie it into two relays, one for high beam and another for low, and run a heavy ground wire back to the engine, body, or frame (wherever the battery ground cable is attached). Use good, new wires (maybe #12 or so) from the relays to the headlight connectors, and back to the common ground. Use the signal from the dimmer switch just to trigger the high and low beam relays. You've just eliminated 80% or so of the connections the headlight current must negotiate and made the headlights noticeably brighter in the process. Is it worth it? Thousands of purchasers of aftermarket headlight relays have certainly thought so, for as long as I can remember!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Why upgrade to 12 volt? [Re: AaronW] #1298453 Mon Feb 11 2019 03:01 AM
Joined: Jun 2004
Posts: 8,073
W
Wrenchbender Ret. Online
Master Gabster
With the headlights on, take jumper wire from the pos. bat. post to the hot wire on the headlight plug. You will be surprised how much brighter the lights get.
George


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

1956 Chevy 1/2-Ton Pickup

Re: Why upgrade to 12 volt? [Re: AaronW] #1298501 Mon Feb 11 2019 03:40 PM
Joined: Jul 2000
Posts: 619
G
Gord&Fran Offline
Shop Shark
If you want brighter headlights, forget about installing relays and install LEDs. Forget halogen; that's 1970's tech.


Gord
----
1954 1/2 ton 235 4 speed
Re: Why upgrade to 12 volt? [Re: Wrenchbender Ret.] #1298572 Tue Feb 12 2019 12:29 AM
Joined: Mar 2010
Posts: 8,205
5
52Carl Offline
Master Gabster
Originally Posted by Wrenchbender Ret.
With the headlights on, take jumper wire from the pos. bat. post to the hot wire on the headlight plug. You will be surprised how much brighter the lights get.
George

This test will let you know if you need the relays or not. I would add doing a similar test of the ground by jumping from a known good ground (battery would be best) and the ground of each headlight. A relay only addresses the positive side of the equation.
Carl

Re: Why upgrade to 12 volt? [Re: AaronW] #1298587 Tue Feb 12 2019 01:30 AM
Joined: Jan 2002
Posts: 1,953
C
cmayna Offline
Shop Shark
Why upgrade to 12v? So you can keep your phone charged while you text and drive!! Ohhhhhhh, don't get me cookin' about that!


Craig's '50 Chevy 3100 5 window
My truck
If I'm not working on my truck or VW camper, I'm fishing with the wife or smoking Salmon.
Re: Why upgrade to 12 volt? [Re: AaronW] #1298609 Tue Feb 12 2019 05:40 AM
Joined: Feb 2004
Posts: 18,845
H
Hotrod Lincoln Online
Boltergeist
Actually, most personal electronics run on 5 volts, so the 7+ volts available when a 6V system has the engine running charges stuff just fine! Ditto on the texting and driving- - - - - -shove somebody's smart phone where the sun don't shine. but use a little K-Y jelly if you're feeling merciful!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Why upgrade to 12 volt? [Re: AaronW] #1298618 Tue Feb 12 2019 10:23 AM
Joined: Sep 2001
Posts: 28,323
tclederman Offline
Boltergeist
I recently bought a cheap/Chinese (shipped from China), cigarette-lighter socket-adapter for two USB ports.
The adapter displays vehicle electrical system voltage. I will post a report on how well it works on a 6v system.

On my small 12v truck, it displays a little less than 12v when the truck is off, and it shows around 12.4v when the truck engine is running.

I’ll test it on a 6v truck (idling, and turned off) - charging a GPS and a cell phone (separately, and together).


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 48 years
1954 3104 5-window pickup w/Hydra-Matic - part of the family for 14 years
Z-series (54/55) GMC 350 (2-ton) COE - now part of Dave's family
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engine are not "splash oilers" - this is a splash oiler.
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