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#1
06-24-2026, 09:22 PM
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77 Trans Am Cluster Help or Diagram
Howdy, replacing the circuit board in my cluster, also replacing some bulbs. I am curious what the bulb circled in red is for and what purpose the metal is supposed to have. There was nothing attached to it when I pulled the cluster. There is evidence that someone else has been in this dash before though. Thanks.
1977 Trans Am with a tach |
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#2
06-25-2026, 09:49 AM
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Looks like the fiber optic fitting for the ash tray light, there should be a long fiber optic wire coming out of the metal housing that goes to the ash tray.
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#3
06-25-2026, 01:54 PM
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Yup, for the Fiberoptic .
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#4
06-25-2026, 11:20 PM
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Appreciate the clarification. Car doesn't seem to still have that wire, my harness is a mess from the previous owners. Just making sure it wasn't anything too important.
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#5
06-26-2026, 06:59 AM
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The fiber optic cable isn't a 'wire' so probably not included in a wiring harness.
The fiber optic cable goes to the back of the lighter which is probably still there unless lighter is removed? 
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#6
06-26-2026, 07:14 AM
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A fiber optic cable looks like monofilament fishing line that’s black most times.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#7
06-26-2026, 05:15 PM
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My 1981 has two of those but appear to be attached to regular wires. One one the standard 8 illumination bulb, black drk. blue, and the other to the 33 brake light bulb , black lgt blue, that looks to be a ground. The warning can be activated by the emergency brake on or pressure issues with the combination valve.
Not sure why the manual has the gauge circuit upside down. |
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#8
06-27-2026, 05:55 PM
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That's so when you've got your head crammed under the dash it looks right side up. 😀
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If it breaks. I didn't want it in the first place. _____________________________________________ 69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN. |
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