Left turn sig. and brake out - The 1947 - Present Chevrolet & GMC Truck Message Board Network

smoked68 · 08-09-2007, 04:29 PM

OK guys heres the newest escapade. Noticed last night that the left rear turn sig. and the brake light (same side) are not working. The running light does though??? Also the idiot light (brake, on the instrument panel) is now on. Brakes are working just fine for now, I am concerned though. So, I noticed that when we had the turn sig. cam issue that none of the rear sigs or brake lights worked. Again running lights ok. Front turn sigs. both work fine as do the rt. rear??? What to do what to do. Any and all ideas welcomed, this thing acts like its 40 years old. Thanks, Mike............

'68 longbed · 08-09-2007, 04:54 PM

IF had a bad ground all yor lights would be goofy...i'd say a bad socket or filiments in the bulb are crossing. change the bulb, clean the socket would be a good start.

68K20 x Drill · 08-09-2007, 04:56 PM

try the hazards, they use a different switch and blinker.

Longhorn Man · 08-09-2007, 07:10 PM

the brake light and flasher on one side... sounds like a bad bulb, or a single bad wire, or a bad turn signal switch.
I wouls suspect it in that order.

**Stocker** · 08-09-2007, 07:22 PM

^ Yup, brake & t.s. light use the same filament... Bad bulb may *possibly* cause dash light to come on? If it's a bad bulb or wire, it won't affect the operation of the brakes at all.

cdowns · 08-09-2007, 07:54 PM

as far as the idiot light on the dash i'd suggest checking the level of fluid in the master cylinder and if you unplug the wire from the switch on the combination valve it should go out if it doesnt that means your getting a back feed to that indicator light

Longhorn Man · 08-09-2007, 09:27 PM

yeah, I forgot to mentione that... the dash light is completely unrelated to the lights in the back.
It indicates a pressure imballance between the front and rear systems... check the master cylinder level, and if one is adnormally low, look for a leak somewhere.

smoked68 · 08-10-2007, 06:19 AM

The bulb is good, brand new, even replaced with another new just to be sure. Fluid levels were checked before I made the post, although the emerg flasher check I did not think of. Will try that when I get off this afternoon. A I have had no blown fuses, could the flasher cause just one side to do this? Also the running light works back there. Oy vey this is not helping my blood pressure. Lastly as I was crawling around under the rear of the truck I noticed that the rear end is leaking or slinging oil at the drive shaft. Is there a seal like that in the rear of the trans?? or is it one that you have to remove the engine stand on your head and face a full moon at midnight to get to. Or hopefully pop it out and replace??? Thanks, Mike......

08-09-2007, 04:29 PM	#1
smoked68 Registered User Join Date: Oct 2006 Location: Rock Hill, SC Posts: 421	Left turn sig. and brake out OK guys heres the newest escapade. Noticed last night that the left rear turn sig. and the brake light (same side) are not working. The running light does though??? Also the idiot light (brake, on the instrument panel) is now on. Brakes are working just fine for now, I am concerned though. So, I noticed that when we had the turn sig. cam issue that none of the rear sigs or brake lights worked. Again running lights ok. Front turn sigs. both work fine as do the rt. rear??? What to do what to do. Any and all ideas welcomed, this thing acts like its 40 years old. Thanks, Mike............ __________________ 1968 chevy shortbed, Dark Shadow Gray 4 bolt 383 Stroker,Weiand Super Charger, disc brakes, 9 inch, 391 gear, 20" Eagle wheels, muncie 4 speed/ Hurst shifter, 4/7 drop, Hedman midlengths, 3 inch exhaust w/ 2 chamber flows. 1966 Mustang with 306 roller, c-4, 9 inch Detroit locker rear. 1965 Fastback Mustang w/347 stroker, top loader 4spd, 9 inch detroit locker. 1966 Mustang coup, 306 roller, c4, 9 inch. 65 Cobra, 427, T6oo, 9inch, of course. First gen Hayabusa, airbox mod and running 2 exhaust cams.. Zoom Zoom Zoom

08-09-2007, 04:54 PM	#2
'68 longbed Registered User Join Date: Jun 2007 Location: mississippi Posts: 181	Re: Left turn sig. and brake out IF had a bad ground all yor lights would be goofy...i'd say a bad socket or filiments in the bulb are crossing. change the bulb, clean the socket would be a good start. __________________ "spiiiider pig, spiiiiider pig, does whatever spiiiider pig does. "

08-09-2007, 04:56 PM	#3
68K20 x Drill Registered User Join Date: Apr 2007 Location: Freedom CA Posts: 488	Re: Left turn sig. and brake out try the hazards, they use a different switch and blinker. __________________ 68 Chevrolet k20 Longbed 350 SM465/205, Dana 44, 14bolt, Power steering, Power Disk Brakes, 35" BFGs. 84 Chevrolet Suburban K20 6.2 Banks turbo TH400/NP208 Now with G80 68 GMC C20 Parts? Truck And a few cars

08-09-2007, 07:10 PM	#4
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Left turn sig. and brake out the brake light and flasher on one side... sounds like a bad bulb, or a single bad wire, or a bad turn signal switch. I wouls suspect it in that order.

08-09-2007, 07:22 PM	#5
Stocker 20' Daredevil (Ret) Join Date: May 2003 Location: Jefferson State Posts: 13,696	Re: Left turn sig. and brake out ^ Yup, brake & t.s. light use the same filament... Bad bulb may possibly cause dash light to come on? If it's a bad bulb or wire, it won't affect the operation of the brakes at all. __________________ - Mike - 1972 K20 LWB 350/350/205 RIP El Jay

08-09-2007, 07:54 PM	#6
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Left turn sig. and brake out as far as the idiot light on the dash i'd suggest checking the level of fluid in the master cylinder and if you unplug the wire from the switch on the combination valve it should go out if it doesnt that means your getting a back feed to that indicator light __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-09-2007, 09:27 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: Left turn sig. and brake out yeah, I forgot to mentione that... the dash light is completely unrelated to the lights in the back. It indicates a pressure imballance between the front and rear systems... check the master cylinder level, and if one is adnormally low, look for a leak somewhere.

08-10-2007, 06:19 AM	#8
smoked68 Registered User Join Date: Oct 2006 Location: Rock Hill, SC Posts: 421	Re: Left turn sig. and brake out The bulb is good, brand new, even replaced with another new just to be sure. Fluid levels were checked before I made the post, although the emerg flasher check I did not think of. Will try that when I get off this afternoon. A I have had no blown fuses, could the flasher cause just one side to do this? Also the running light works back there. Oy vey this is not helping my blood pressure. Lastly as I was crawling around under the rear of the truck I noticed that the rear end is leaking or slinging oil at the drive shaft. Is there a seal like that in the rear of the trans?? or is it one that you have to remove the engine stand on your head and face a full moon at midnight to get to. Or hopefully pop it out and replace??? Thanks, Mike...... __________________ 1968 chevy shortbed, Dark Shadow Gray 4 bolt 383 Stroker,Weiand Super Charger, disc brakes, 9 inch, 391 gear, 20" Eagle wheels, muncie 4 speed/ Hurst shifter, 4/7 drop, Hedman midlengths, 3 inch exhaust w/ 2 chamber flows. 1966 Mustang with 306 roller, c-4, 9 inch Detroit locker rear. 1965 Fastback Mustang w/347 stroker, top loader 4spd, 9 inch detroit locker. 1966 Mustang coup, 306 roller, c4, 9 inch. 65 Cobra, 427, T6oo, 9inch, of course. First gen Hayabusa, airbox mod and running 2 exhaust cams.. Zoom Zoom Zoom



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