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#1
06-11-2007, 01:22 PM
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Id this Defogger Switch?
 We are hoping it has a 70's Trans Am, GP, GTO application. Anybody? thanks!
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--------------------------- Fool Around, Get Hurt, Don't come Crying to me. |
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#2
06-11-2007, 02:42 PM
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#3
06-11-2007, 04:21 PM
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yes, I know that. I'm thinking it may have some Pontiac applications.
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--------------------------- Fool Around, Get Hurt, Don't come Crying to me. |
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#4
06-11-2007, 07:26 PM
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#5
06-11-2007, 09:57 PM
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Quote:
i iwas thinking 77 - 81 bird. i had a 74 g/p with a similar one in it also. i don't know if i save it or not. mike
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so many pontiacs, so little time.................. moderator is a glorified word for an unappreciated prick.................. "Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." --Albert Einstein "There is no such thing as a good tax." "We contend that for a nation to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle." - Winston Churchill |
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#6
06-12-2007, 08:25 AM
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1977 LeMans uses the same switch.
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1976 LeMans B09 Freeway Enforcer, 455/M40 Smokey 1977 Trans Am, 400/M21 Black/Gold Bandit. 44K actual miles 2017 Sierra SLT 1500 Z71 4X4  2019 Canyon SLT Crew 4X4  
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#7
06-12-2007, 09:13 AM
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#8
06-12-2007, 11:10 PM
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Quote:
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#9
06-13-2007, 10:00 PM
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Not 79-81 T/A or Firebird. I have two switches I pulled out of a 79 T/A and a 81 Firebird. Close but no cigar. The mounts on the T/A Firebird switches are about mid way in the black plastic housing. The resistor is the same silver band on the 79 but my son read 4004 for numbers on the resistor(my trifocals are not in yet). The 81 switch has no resistor. hope my pics help. John.
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#10
06-13-2007, 11:23 PM
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4004 is a diode. It's a very generic 1A diode that has been in production for years. I don't believe they are required ;-)
It would probably work for the 2nd gen cars, but stick out slightly further than an original based on the plastic tab pictures. |
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#11
06-15-2007, 11:42 AM
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Ben is right, it's a diode. As cars started having more electronics, diodes were included, wired across relay coils. When relay coils are turned off they create a voltage spike. The diode clamps (suppresses) the spike so it doesn't damage on-board computers.
On an earlier car the presence of the diode will not hurt anything, either. George
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