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03-19-2012, 11:20 AM
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#1 |
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Registered User
Join Date: Jul 2011
Location: El Campo, Tx
Posts: 1,246
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Why when one turn signal burns out does it double the speed of the other?
Why does this happen?
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72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!! |
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03-19-2012, 11:39 AM
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#2 |
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Registered User
Join Date: Jun 2011
Location: Richmond,Va
Posts: 2,934
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Re: Why when one turn signal burns out does it double the speed of the other?
I'll take a shot at explaining it. The flasher has a bi-metallic strip in it that heats and cools to cause the flash. The bulbs are what is considered a "load" on the system. If one bulbs is burned out, causing an open circuit, the flasher does not have to work that load causing it to cycle faster. I'm sure someone like VetteVet can word it better than I just did.
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Nick Carter 1967 C10 Short bed Fleetside Project Cheap Thrills! 2WD C10 Modern/Performance Alignments Easiest Alignment Ever! |
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03-19-2012, 12:15 PM
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#3 |
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Registered User
Join Date: Dec 2006
Location: Rolla, MO
Posts: 2,463
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Re: Why when one turn signal burns out does it double the speed of the other?
I always thought they engineered that in to alert the driver they had a turn signal burned out since you're usually inside the car driving and can't see the turn signals on the outside.
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-Scott- |
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03-19-2012, 03:14 PM
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#4 | |
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Registered User
Join Date: Dec 2008
Location: Yay Area CA
Posts: 2,329
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Re: Why when one turn signal burns out does it double the speed of the other?
The OEM flasher is a thermal bi-metallic type and the speed of the flasher is dependent on resistance (resistance limits current flow and current flow is what heats up the bi-metal element breaking contact). If you lose one bulb on the left side resistance to ground on that side increases resulting in less current draw causing it to flash slower. The right side does not speed up but rather the left side slows down making it seem like the other side sped up. If you have a short to ground it will cause the flasher to cycle really fast until it fails.
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1965 GMC shortwide big window 1969 Chevy C20 long (for now) 2005 Silverado 2500HD Crew Cab Quote:
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03-19-2012, 05:17 PM
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#5 |
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Registered User
 
Join Date: Oct 2011
Location: Sacramento, Calif
Posts: 70
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Re: Why when one turn signal burns out does it double the speed of the other?
What year vehicle? It matters.
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1998 GMC Suburban 2500 454 4X4 1984 GMC Jimmy - 3/4 ton axles, 5.7TBI 1990 GMC Suburban (Parts Donor) scrapped 1965 Buick Riviera - (Sold) 1999 Mercury Grand Marquis 1965 GMC SBSS (Sold) |
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