Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 02-04-2020, 10:10 PM   #1
Joe/Ct
Senior Member
 
Joe/Ct's Avatar
 
Join Date: May 2010
Location: Waterford, CT
Posts: 216
Default Burning out headlight bulbs

I have a '28 roadster with positive ground 6 v battery and a generator. I keep burning out headlight bulbs. I have the generator set for 10 amps with the lights on. Suggestions?
__________________
Joe/Ct

"The older I get, the better I was"
Joe/Ct is offline   Reply With Quote
Old 02-05-2020, 12:19 AM   #2
J Franklin
Senior Member
 
J Franklin's Avatar
 
Join Date: May 2010
Location: oregon
Posts: 4,111
Default Re: Burning out headlight bulbs

First the generator should put out about 0 amps or less with the lights on. Next make sure the light sockets are clean of corrosion and they and battery are securely grounded. Check for loose connections between the generator and the battery. Older bulbs were rated for 6-8 volts and new Chinese bulbs are 6 volt.
J Franklin is online now   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 02-05-2020, 04:05 AM   #3
johnbuckley
Senior Member
 
johnbuckley's Avatar
 
Join Date: Jul 2010
Location: United Kingdom
Posts: 1,164
Default Re: Burning out headlight bulbs

poor ground at headlamp fitting is another possiblity.
johnbuckley is offline   Reply With Quote
Old 02-05-2020, 04:32 AM   #4
updraught
Senior Member
 
updraught's Avatar
 
Join Date: Feb 2015
Location: Australia
Posts: 1,285
Default Re: Burning out headlight bulbs

If you disconnect the battery with the lights on and rev the engine the lights will blow as the power goes straight to the lights, instead of being absorbed into the battery.
So check battery connections.
updraught is offline   Reply With Quote
Old 02-05-2020, 04:44 AM   #5
Synchro909
Senior Member
 
Synchro909's Avatar
 
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 4,738
Default Re: Burning out headlight bulbs

I think Updraught has it right.
__________________
For the first half of our life we trade our health for wealth. For the second half, we trade our wealth for health.
Synchro909 is offline   Reply With Quote
Old 02-05-2020, 08:26 AM   #6
eagle
Senior Member
 
eagle's Avatar
 
Join Date: Aug 2011
Location: Eagle Bend, MN
Posts: 1,549
Default Re: Burning out headlight bulbs

Quote:
Originally Posted by Joe/Ct View Post
I have a '28 roadster with positive ground 6 v battery and a generator. I keep burning out headlight bulbs. I have the generator set for 10 amps with the lights on. Suggestions?
First make sure you have a 6v battery and not an 8v. Second, if you have a battery disconnect make sure you never disconnect it while engine is running. Third, get yourself a fun projects voltage regulator, battery will last longer, no more messing with the third brush, they are a great addition to an A.
__________________
"There are some that can destroy an anvil with a teaspoon and shouldn't be allowed to touch anything resembling a tool."
eagle is offline   Reply With Quote
Old 02-05-2020, 09:46 AM   #7
rotorwrench
Senior Member
 
rotorwrench's Avatar
 
Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 10,997
Default Re: Burning out headlight bulbs

Some reproduction bulbs may not be very resilient to rough roads or common use. The better the condition of the suspension and tires, the better everything will last. Lamps only draw the current they need and shouldn't be affected all that much by generator output. The battery sets the voltage of the output so it shouldn't get high enough to burn the bulbs out if it is the correct voltage. Higher than normal voltage will certainly burn a bulb filament. Higher than normal current will overcharge the battery and overwork the generator. A bad alternator can burn bulbs filaments if the car is converted to alternator and the diode bridge goes out.

A person could try a different brand of bulbs if available.
rotorwrench is offline   Reply With Quote
Old 02-05-2020, 10:27 AM   #8
Patrick L.
Senior Member
 
Patrick L.'s Avatar
 
Join Date: May 2010
Location: Upstate NY and western Florida
Posts: 5,315
Default Re: Burning out headlight bulbs

I agree with most of the responses. A poor connection/ground can cause these generators to run away and produce 30-40v. Also 10 amp charge when running with lights on is a bit too much.
Patrick L. is offline   Reply With Quote
Old 02-05-2020, 11:34 AM   #9
redmodelt
Senior Member
 
redmodelt's Avatar
 
Join Date: May 2010
Location: Portland OR
Posts: 4,892
Default Re: Burning out headlight bulbs

With the lights off and an engine speed approx in the range of 20MPH the generator would be set in the 4-6 amps depending on driving conditions. While I would have to do the math, the KR Wilson generator testing and setup stand would be spinning the generator in approx the 900-1000 RPM range for setup. At 10 amps with the lights on is too high esp so if setup at idle speeds. As RPM increase so does output. The cutout is not a limiting device so as long as the points are closed the line voltage is going somewhere, lights battery etc. At 10 amps on a long drive would be good way to overcharge and boil your battery. That is why the output was set depending on the season and how much the cars were driven. Short trips higher base output, longer trips lower output.

While the diode type cutout replacement is not hard to find, the Fun-Project actual regulator has been hit/miss for sometime re availability.
__________________
I know the voices aren't real but damn they have some good ideas!
redmodelt is online now   Reply With Quote
Old 02-05-2020, 02:55 PM   #10
Tom Endy
Senior Member
 
Tom Endy's Avatar
 
Join Date: May 2010
Location: Southern California
Posts: 2,557
Default Re: Burning out headlight bulbs

A likely culprit is the battery ground cable where it connects to the frame. It is out of sight and out of mind and under the car where it is exposed to all kind of corrosion. Remove the battery to access it. Remove the bolt, nut, and the cable and wire wheel them. There is a raised boss on the frame where the cable connects. Clean this area thoroughly, remove all rust, paint, crud, and any powder coating. Make sure it is clean bare metal. This should be done every time you replace the battery.

Tom Endy
Tom Endy is offline   Reply With Quote
Old 02-05-2020, 04:36 PM   #11
Synchro909
Senior Member
 
Synchro909's Avatar
 
Join Date: Jun 2014
Location: Melbourne, Australia
Posts: 4,738
Default Re: Burning out headlight bulbs

Quote:
Originally Posted by Tom Endy View Post
A likely culprit is the battery ground cable where it connects to the frame. It is out of sight and out of mind and under the car where it is exposed to all kind of corrosion. Remove the battery to access it. Remove the bolt, nut, and the cable and wire wheel them. There is a raised boss on the frame where the cable connects. Clean this area thoroughly, remove all rust, paint, crud, and any powder coating. Make sure it is clean bare metal. This should be done every time you replace the battery.

Tom Endy
Very good advice but I'd also use some dielectric grease on the connection. It will prevent any further corrosion and help make a good connection.
__________________
For the first half of our life we trade our health for wealth. For the second half, we trade our wealth for health.
Synchro909 is offline   Reply With Quote
Old 02-05-2020, 07:41 PM   #12
IndyA
Member
 
Join Date: Dec 2016
Posts: 44
Default Re: Burning out headlight bulbs

Doesn't T.J ( I believe that was the first responder's name?) had a mis print..shouldn't the am meter read "0" when the lights are OFF not on???
IndyA is offline   Reply With Quote
Old 02-05-2020, 08:32 PM   #13
redmodelt
Senior Member
 
redmodelt's Avatar
 
Join Date: May 2010
Location: Portland OR
Posts: 4,892
Default Re: Burning out headlight bulbs

If you are talking about J Franklin's post; Not sure what you mean by 0 with the lights off? In normal operation with a points type cutout, the meter can drop to 0 or just above at lower road speeds with the lights on and maybe just under when stopped sitting with lights on.
__________________
I know the voices aren't real but damn they have some good ideas!
redmodelt is online now   Reply With Quote
Old 02-05-2020, 08:50 PM   #14
IndyA
Member
 
Join Date: Dec 2016
Posts: 44
Default Re: Burning out headlight bulbs

Remodelt is right... with my former bulbs (i've now switched to LED's) the am meter should show around 10 amps at idle and bulbs off.... with the bulbs on the meter should go down to around 0. The LED's use only about 3 amps but that's not material to this conversation... Apologize for the mistake...
IndyA is offline   Reply With Quote
Old 02-15-2020, 01:09 PM   #15
DHZIEMAN
Senior Member
 
Join Date: Dec 2016
Location: Sunrise Beach, Mo
Posts: 380
Default Re: Burning out headlight bulbs

Possibly a bad ground someplace!
DHZIEMAN is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 08:47 PM.