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^ volt headlights #1153417 Fri Mar 04 2016 04:06 PM
Joined: Sep 2008
Posts: 93
R
red 53 pickup Offline OP
Shop Shark
My 53 has been all done over(year right)everything is good, changed out the Gen. to a 6 volt Alt. Problem is my head lights are WEAK. Do I need new ones ore what other can be wrong? This sight has always been the bestis of sights

Re: ^ volt headlights [Re: red 53 pickup] #1153437 Fri Mar 04 2016 04:59 PM
Joined: Sep 2013
Posts: 948
M
moparguy Offline
Shop Shark
I have a 6 volt alternator and my lights are very adequate. This wasn't always the case however since my onewire alternator didn't charge at low rpm and once charging would kick out at low rpm's (below 2k or so). To fix that I ran a wire from the accessory side of my ignition switch with a tail light fixture and bulb located near the switch under the dash. Other end goes to the inside terminal of two terminals near the charge (or hot terminal) of the alternator. This makes the alternator charge if it's turning.

I also ran a 8 ga. wire from the alternator to the battery wire on
the starter. No problems now.

If the above makes no sense see this; https://www.youtube.com/watch?v=Zcaisr1Gh6o

Good Luck, RR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: ^ volt headlights [Re: red 53 pickup] #1153438 Fri Mar 04 2016 04:59 PM
Joined: Nov 2005
Posts: 5,553
3
3B Offline
Master Gabster
Hy red 53 pickup, there could be a high resistant connection somewhere in the wiring system, possibly in the dimmer switch. Measure the voltage at the headlights to verify what is available for the headlights. Verify the ground wires for the headlights, also verify that the wires to the headlights are going to the correct terminals on the headlights, one harness I installed had every connection to the headlights in the wrong spot. If everything is good, replace the headlights, hope that helps.

Re: ^ volt headlights [Re: red 53 pickup] #1153461 Fri Mar 04 2016 06:06 PM
Joined: Feb 2004
Posts: 19,484
H
Hotrod Lincoln Offline
Boltergeist
First check the voltage at the battery terminals. With the engine running at 1,000-1,500 RPM it should be around 7.5 volts. Then check the voltage at the headlights. It should be very close to the same voltage, at least 7V. If it's not, find the high resistance connection- - - -ammeter, headlight switch, dimmer switch, junction blocks, etc. The dimmer switch is by far the most likely choke point. The simple solution is to install a heavy hot wire (#8 or so) from the battery to near the headlights, and use a relay from there to provide a low-resistance high/low beam circuit. Use the dimmer switch to trigger the relay. Also be sure the headlights have a very good ground circuit.
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: ^ volt headlights [Re: red 53 pickup] #1153649 Sat Mar 05 2016 10:02 PM
Joined: Jun 2004
Posts: 8,153
W
Wrenchbender Ret. Offline
Master Gabster
Make sure someone hasn't put 12 volt sealed beams in at one time.


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

1956 Chevy 1/2-Ton Pickup

Re: ^ volt headlights [Re: red 53 pickup] #1153662 Sat Mar 05 2016 11:23 PM
Joined: Aug 2005
Posts: 8,805
Tiny Offline
Global Mod
I use a 6v one wire alternator and it charges just fine at idle. I'd listen to Wrenchbender's advise & check that first.


Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
Re: ^ volt headlights [Re: red 53 pickup] #1153771 Sun Mar 06 2016 08:05 PM
Joined: Sep 2008
Posts: 93
R
red 53 pickup Offline OP
Shop Shark
Thanks everyone, got some good advice...Paul

Re: ^ volt headlights [Re: red 53 pickup] #1153793 Sun Mar 06 2016 10:42 PM
Joined: Nov 2010
Posts: 344
R
root Offline
Shop Shark
Has anyone thought about the grounds on the lights? With bad grounds the lights will be dim. root

Re: ^ volt headlights [Re: red 53 pickup] #1153796 Sun Mar 06 2016 11:09 PM
Joined: Dec 2015
Posts: 2,049
69Cuda Offline
Big Bolt Forum Moderator
If I am reading this correctly, your lights were fine until you switched from gen to Alt, right? I am assuming your alt is a 1-wire and you are not using the regulator that was running with the generator, with the mechanical regulators, you could go in and adjust to get a bit more voltage, some would even run 8 V and put an 8V battery in the vehicle to make the starter spin faster. It may be that your generator/regulator was actually putting out higher voltage than your alternator.


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
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Sufficient unto the day is the evil thereof
Re: ^ volt headlights [Re: red 53 pickup] #1153797 Sun Mar 06 2016 11:16 PM
Joined: Oct 2006
Posts: 951
B
BC52 Offline
Shop Shark
Although I have a 12 volt system,I had a similar problem. I was losing almost 2 volts through the wiring and switch. The headlight switch now controls a relay,and I can use H4 headlight that are very bright.

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