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Yesterday, 08:24 PM
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Senior Member
 
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,744
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Re: Electrical
The next thing to test is the turn signal switch. These wire colors are on the wiring harness side of the connector going to the steering column wiring.
purple - power from turn signal flasher brown - power from hazard flasher white - brake light power black - horn button light blue - left front turn signal light dark blue - right front turn signal light yellow - left rear turn signal/brake light green - right rear turn signal/brake light Leave the steering column connected to this connector, and insert a test probe into the back of the wiring harness side connector at the points you want to test. The interesting colors in your case are white for brake light power. Make sure the white wire has 12V with brake pedal pressed, and doesn't have 12V with brake released. If that works repeat the test at the yellow and green wires. Follow the wiring diagram in the service manual for your truck's year. Or here is a general purpose 67-72 diagram https://67-72chevytrucks.com/vboard/...27#post9186727 |
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