63 Impala unknown firewall wires - Impala Tech
Electrical & Wiring Troubleshooting electrical problems

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post #1 of 6 (permalink) Old 04-22-2019, 04:00 PM Thread Starter
Join Date: Jan 2019
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63 Impala unknown firewall wires

Hello Impala world. So I have a 63 impala 409 4 speed manual transmission convertible power windows and top from canada. Now that im putting the car back together, im confused on where some of these wires go. I didn't originally take the car apart so this is why im confused. On the firewall, there is one wire that has a single connection on it that i don't know where or what it is for. I do have a red wire that fits into the slot and could possibly be wired to the positive on the starter. Second mystery wire is that there is a grommet that has two wires coming out of it. Wires are thick such as a 110 wall plug and the grommet is perfectly formed into the wires making me think it is a factory installed part. I believe this might be the back up light switch wires for the car. If someone can enlighten me on this i gladly appreciate the help.

Thank you
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post #2 of 6 (permalink) Old 04-22-2019, 04:04 PM Thread Starter
Join Date: Jan 2019
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Here are the pictures
Attached Images
File Type: jpg D3809387-4F4D-44D8-97DE-557D568E2F15_1555963379318.jpg (17.5 KB, 35 views)
File Type: jpg 0A74674E-5ECB-422D-BAFC-772015B44D19_1555963393180.jpg (17.6 KB, 27 views)
File Type: jpg 1E857F2B-530C-4CF3-8CEE-83567EDD5CEF_1555963410077.jpg (26.1 KB, 27 views)
File Type: jpg 43B5AC56-305C-4EE5-917F-2E5C8C5BD8FE_1555963423934.jpg (19.1 KB, 29 views)
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post #3 of 6 (permalink) Old 04-22-2019, 07:00 PM
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Location: Greenville, SC
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I'm guessing the red wire goes to the generator. The other ones I have no clue. A factory assembly manual would make this a breeze though.

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post #4 of 6 (permalink) Old 04-22-2019, 08:37 PM Thread Starter
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Yeah i purchased a very detailed wiring diagram and im still a bit confused. I believe the red wire goes to the starter providing direct power for the windows and the convertible top. I did see a little grease at the end of the terminal so I believe it goes to the starter. The other two wires i believe are the back up switch wires since the switch is located on the transmission itself. I will find out once i start to put the car back together. Thanks for your input.
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post #5 of 6 (permalink) Old 04-23-2019, 08:41 AM
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Location: Coopersville, MI
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I believe you are correct that the two thick wires go to the reverse switch on the transmission, but the connector on the end appears to be cut off. I can't tell the wire colors in the photo, but if memory (as I don't have a schematic in front of me, serves me right one is purple in color. The red wire would require me to have a drawing in front of me and have to see where the other end terminates.
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post #6 of 6 (permalink) Old 04-23-2019, 07:35 PM
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The wiring diagram only shows the circuits. The assembly manual has detailed diagrams on how the wires are routed, clipped in place, bundled, etc. You need that.

Two doors, four doors, wagons, and ragtops.
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