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Old 05-14-2018, 10:14 AM   #1
70GMCer
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What is this wire

Found this under the carpet.

Anyone know what this wire is for?
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Old 05-15-2018, 03:32 AM   #2
chengny
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Re: What is this wire

IDK how the circuit is currently wired/routed - but some modifications must have been done. As original:

The cut leads went to the switch for the backup lights.

DK BLU is/was hot from the fuse block (fed by the 15A TURN B/U fuse)

LT GRN supplied the B/U lamps - via the rear lighting harness.

Because of the presence of the grommet, it's likely that the transmission was changed from a 4 speed manual to either a 3 speed manual or an A/T. The B/U light switch used with a 4 speed MT is mounted on the transmission, while the other two types are located in the cab.
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Old 05-15-2018, 06:51 AM   #3
70GMCer
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Re: What is this wire

Quote:
Originally Posted by chengny View Post
IDK how the circuit is currently wired/routed - but some modifications must have been done. As original:

The cut leads went to the switch for the backup lights.

DK BLU is/was hot from the fuse block (fed by the 15A TURN B/U fuse)

LT GRN supplied the B/U lamps - via the rear lighting harness.

Because of the presence of the grommet, it's likely that the transmission was changed from a 4 speed manual to either a 3 speed manual or an A/T. The B/U light switch used with a 4 speed MT is mounted on the transmission, while the other two types are located in the cab.
That would explain why I have no backup lights then.

The truck is an original auto trans. So, is the backup light switch located on the column?

Is it a part of the neutral safety switch?

Thanks for the help on this...
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