Vintage Chevrolet Club Forums
A nonprofit organization dedicated to the preservation, restoration and enjoyment of all Chevrolets and GMCs.

VISITORS: You are welcome to read our forums. If you want to participate FREE then you need to register. Join the VCCA and get access to the member-only features of the forum, including the ability to attach/upload photos. You'll also receive our monthly magazine "Generator & Distributor". Yearly membership as low as $25!

VCCA MEMBERS: Already a member? Great! Info to access the members-only area.

Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#374976 - 09/07/16 07:49 PM 1931 6V brake light bulb
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
In the last month I have replaced both #87 brake light bulbs twice in my '31 coupe. I've only driven about 30 miles since I replaced them last time. I just happened to check and found they were out again today. The ones that blew were GE, and I replaced this time with Wagner. I'm using YnZ's turn signal kit which is part of my harness. The front signal lights are in the cowl lights. The bulbs in the cowl lights have not blown in the 8 years the car has been restored. Any thoughts?
Sid

Top
Vintage Auto Garage - 6 Volt
#374980 - 09/07/16 08:50 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Junkyard Dog Offline




Registered: 11/23/01
Posts: 28629
Loc: Eagle Point, Oregon
Check for a bad ground, bad light sockets or a short in the wiring.

laugh wink beer2
_________________________
The Mangy Old Mutt

"If It's Not Junk.....It's Not Treasure!"

Top
#375082 - 09/08/16 07:03 PM Re: 1931 6V brake light bulb [Re: Junkyard Dog]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Sockets and ground checked out okay, but generator is putting out 10 volts. Will try to adj third brush. Thanks
Sid

Top
#375086 - 09/08/16 07:47 PM Re: 1931 6V brake light bulb [Re: 6wheel]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Finally figured out how to move brush. Generator now putting out 7.8 volts max. Hopefully, this will stop bulb blowing. I don't know how to secure brush. The screw on back of generator is tied to a bracket inside, but the bracket is no where near the new location of the brush.
Sid

Top
#375091 - 09/08/16 08:57 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Bill Barker Offline
Previous ChatMaster


Registered: 11/20/01
Posts: 5746
Loc: Issaquah, WA



Instructions are Available HERE.

REMEMBER: Move DOWN to go UP. And UP to go DOWN.
(Move brush DOWN to Increase Voltage, and brush UP to lower voltage.)

Top
#375110 - 09/09/16 01:41 AM Re: 1931 6V brake light bulb [Re: Bill Barker]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Thanks Bill, I'd seen similar picture in manual. I guess I need to study that part of the generator more closely. I moved the brush by using a screw driver like a pry bar. The screw shown in the picture on the back of the generator fastens a small plate on the inside, but it doesn't appear to attach to anything.
Sid

Top
#375111 - 09/09/16 01:58 AM Re: 1931 6V brake light bulb [Re: 6wheel]
Junkyard Dog Offline




Registered: 11/23/01
Posts: 28629
Loc: Eagle Point, Oregon
Quote:
The screw shown in the picture on the back of the generator fastens a small plate on the inside, but it doesn't appear to attach to anything.


The plate doesn't "attach" to anything...instead it holds pressure on the third brush bracket so that the third brush doesn't move after the screw on the end frame is tightened down. Check inside of the generator to make sure that the plate is on top of the third brush bracket to hold it in place.

laugh wink beer2
_________________________
The Mangy Old Mutt

"If It's Not Junk.....It's Not Treasure!"

Top
#375421 - 09/14/16 05:24 PM Re: 1931 6V brake light bulb [Re: Junkyard Dog]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
I found a spare generator in the attic. Its third brush has a bronze bracket that is secured by the clamp like the Dog days. The third brush on the generator on my 31 does not have this bronze bracket, or maybe not all of it. It seems very secure without being tied down. I had to move it by prying with a screw driver, and after driving 20 miles yesterday, it hasn't moved. The lower voltage is a good thing too. So far no more blown bulbs. Thanks guys.
Sid

Top
#380320 - 12/14/16 06:58 PM Re: 1931 6V brake light bulb [Re: 6wheel]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
I've driven the '31 about 150 miles in the last few months, and I noticed after a short drive that it was making about 7 amps at idle. Checked the stop light bulbs and found that both were blown again. I plan to have my spare generator checked out, and if it's okay I'll run it, since it's third brush appears to be complete.

Top
#380323 - 12/14/16 08:08 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Chev Nut Offline




Registered: 01/08/02
Posts: 24989
Loc: West Allis,Wi.
The amps will not blow the bulbs. Too many volts will do that.
_________________________
Chevgene

Top
#380324 - 12/14/16 08:11 PM Re: 1931 6V brake light bulb [Re: Chev Nut]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Thanks Gene. I'll check the generator output again. I presume the third brush has slipped again.
Sid

Top
#380330 - 12/14/16 09:19 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Junkyard Dog Offline




Registered: 11/23/01
Posts: 28629
Loc: Eagle Point, Oregon
If the clamp for the third brush is tightened down correctly the third brush should not slip.

laugh wink beer2
_________________________
The Mangy Old Mutt

"If It's Not Junk.....It's Not Treasure!"

Top
#380332 - 12/14/16 09:20 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Chev Nut Offline




Registered: 01/08/02
Posts: 24989
Loc: West Allis,Wi.
Check the voltage, Run engine for about 20 minutes at least fast idle) and it sould be around 7.5 volts.
_________________________
Chevgene

Top
#380735 - 12/22/16 08:22 PM Re: 1931 6V brake light bulb [Re: Chev Nut]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Generator output is still 7.5 volts. What else could blow bulbs? The bulbs fit very tightly in the reproduction taillight buckets. Maybe they are hitting the inside of the bucket as the car bounces. Also,every bulb I have used is made in China...am I the only one with this problem? I found 2 new bulbs in my stash with blown filaments. As another test I have a new working 87 brake light bulb in the left taillight bucket. We will see how long it lasts.
Thanks,
Sid

Top
#380779 - 12/23/16 04:35 AM Re: 1931 6V brake light bulb [Re: 6wheel]
Junkyard Dog Offline




Registered: 11/23/01
Posts: 28629
Loc: Eagle Point, Oregon
Bulbs made in China are junk.

The generator output of 7.5 volts is perfect.

laugh wink beer2


Edited by Junkyard Dog (12/23/16 04:35 AM)
_________________________
The Mangy Old Mutt

"If It's Not Junk.....It's Not Treasure!"

Top
#380898 - 12/24/16 09:45 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Tiny Offline



Registered: 01/01/06
Posts: 4469
Loc: South Central Kansas
Some China stuff is OK but most is junk. I bought a dozen 2530 headlight bulbs that were made in China. The low beam would burn out within 5 seconds. The high beam would last a while. I threw them away and bought two dozen NOS bulbs I found on ebay. If it were me I'd put another Chinese in, lay a brick on the brake pedal, pull up my chair & see if they do the same thing. Watch them for 20-30 minutes without driving the car. See if they simply burn out like the junk ones I bought. Does the inside of the glass have the typical burn mark a burned out bulb makes? For what it's worth I've had pretty good luck with Chinese Wagner bulbs.


Edited by Tiny (12/24/16 09:53 PM)
_________________________
VCCA Member 43216
Save a life, adopt a senior shelter pet.

Top
#381650 - 01/09/17 08:16 PM Re: 1931 6V brake light bulb [Re: Tiny]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
I ran the car at fast idle with left turn signal on the entire time. Bulb did not blow. Will continue to watch.
Thanks, Sid

Top
#382280 - 01/19/17 05:44 PM Re: 1931 6V brake light bulb [Re: 6wheel]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Put new bulb in right side and drove car about 5 miles. Checked bulbs when I got home...both brake light bulbs where blown. There was no discoloration. The filament just had a short section missing. Installed new bulbs in both buckets. One is GE, other is Wagner. I also moved the sockets so that the glass part of the bulbs couldn't touch the bucket.

Top
#382345 - 01/20/17 03:25 PM Re: 1931 6V brake light bulb [Re: 6wheel]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
I tested it running in the garage for 30 minutes. I left the brake lights on for 15 minutes, flashed the brake lights for 5 minutes, and flashed the left and right blinkers for 5 minutes each. I also tapped on each tailight bucket several times. Both bulbs continued to burn. I'll test drive it when the weather breaks.
Sid

Top
#382349 - 01/20/17 03:31 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Junkyard Dog Offline




Registered: 11/23/01
Posts: 28629
Loc: Eagle Point, Oregon
Quote:
Generator output is still 7.5 volts.


Is that at idle? If so, what is the generator output at speed when driving?

laugh wink beer2
_________________________
The Mangy Old Mutt

"If It's Not Junk.....It's Not Treasure!"

Top
#382351 - 01/20/17 04:20 PM Re: 1931 6V brake light bulb [Re: Junkyard Dog]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
It was at fast idle, and output was 7.5 volts.

Top
#382353 - 01/20/17 04:30 PM Re: 1931 6V brake light bulb [Re: 6wheel]
Junkyard Dog Offline




Registered: 11/23/01
Posts: 28629
Loc: Eagle Point, Oregon
What is the output while driving at speed?? The output might be too high which would cause the bulbs to blow while you are driving.

laugh wink beer2
_________________________
The Mangy Old Mutt

"If It's Not Junk.....It's Not Treasure!"

Top
#382354 - 01/20/17 04:43 PM Re: 1931 6V brake light bulb [Re: Junkyard Dog]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Thanks Dog. I'll check voltage at higher RPM.

Top
#382367 - 01/20/17 07:46 PM Re: 1931 6V brake light bulb [Re: 6wheel]
6wheel Offline
1000

Registered: 11/09/05
Posts: 1054
Loc: Mississippi
Output voltage at high RPM is 7.85. I just test drove it for about 3 miles. Checked bulbs halfway and they were good. Drove rest of way home and they were both blown! Could the brake light switch do this? It is old, but works. The turn signal switch came with the harness from YNZ.
Sid

Top
#382370 - 01/20/17 08:04 PM Re: 1931 6V brake light bulb [Re: 6wheel]
a3alf Offline

Backyard Mechanic

Registered: 02/12/11
Posts: 285
Loc: New York
If there is no burn marks and the filament is broken then the bulb is hitting something when driving.
Al

Top
Page 1 of 2 1 2 >


Moderator:  AntiqueMechanic, Coupefan 
Your Status
Please login to post or reply.* * *
Send My Password
Who's Online
1 Chat Members (Peter_Gariepy), 1 Guest and 35 Spiders or Bots online.
Key: Admin, Global Mod, Mod
Today's Birthdays
32confederate
Helpful Links
Forum Registration
New User Forum
Members Only Forum
Reset Your Password
Kill Your Cookies

VCCA Home
Join the VCCA
Member Photos
My 31' Chevy Show
What is missing?
31' headlight reflectors re-silvered at home
1936 Roadster - S. Africa
Chevy on the Levee
'37 Seat
Forum Stats
15086 Chat Users
79 Forums
50178 Topics
366686 Posts

Max Online: 304 @ 06/18/16 10:00 AM

 

Notice: Any comments posted herein do not necessarily reflect the official position of the VCCA.