 speedo high beam indicator - wires and socket questions |
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| jimkelly |
 Nov 17 2013, 11:04 AM
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#1
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Delaware USA  Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region  |
my 1975 car seems to have a 2 prong plastic type socket, which appears to have an internal connection to the speedo can for ground.
my question is why does this socket have 2 spades? in my 1972 car, the white/green wire was cut and this light was spliced into the regular dash lights but this car seems to use a metal socket that grounds directly to speedo can. I want to revise my wires once again to allow for a high beam indicator light in my speedo. thoughts? should I use a metal or plastic type socket? I know - or think - that some of my lights are in plastic dual spade sockets because they are feed ground thru the ecu - like oil pressure dummy light? thus wondering if there are 2 kinds of plastic sockets? thanks Attached image(s)    
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Replies(1 - 3)
| toolguy |
Nov 17 2013, 06:09 PM
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#2
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Senior Member Group: Members Posts: 1,268 Joined: 2-April 11 From: San Diego / El Cajon Member No.: 12,889 Region Association: Southern California 
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metal socket grounds to instruments common ground. . plastic socket = no electrical conductivity therefor it has to have a ground wire connection |
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| StratPlayer |
Nov 17 2013, 06:15 PM
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#3
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StratPlayer Group: Members Posts: 3,278 Joined: 27-December 02 From: SLC, Utah Member No.: 27 Region Association: Rocky Mountains 
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The plastic holders have a metal tab on the side that grounds the holder.
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| jimkelly |
Nov 17 2013, 06:30 PM
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#4
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Delaware USA Group: Members Posts: 4,969 Joined: 5-August 04 From: Delaware, USA Member No.: 2,460 Region Association: MidAtlantic Region |
i'm assuming there are at least 2 kinds of plastic sockets, one with ground to can and one that needs ground from ecu.
here also is a pic of a plastic socket without a grounding tab, and this one seems to take a different bulb than other sockets. thanks guys! jim Attached image(s) 
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