73-87 Chevy _ GMC Trucks > Electrical

New to forum: Have a 1986 C30 Light issue sat from 2008 untill now!

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SFR7771:
I'm having a lighting issue on my 1986 c30:

    Working: Headlights, front blinkers, cab lights, and the left rear blinker.

    Not working: Tail lights, marker lights, dash lights, and right rear blinker.

    I’ve checked all the fuses, wiring, the fuse on the red wire under the hood, and the wire block.

    I’m also getting no power at the 5-pin trailer connector in the bed.

Is there anything else I should check? I’m trying to get this fixed before driving to the C10 Nationals tomorrow.

Captkaos:
Are you getting power at the rear light sockets? power at the cluster connector?  Power at the rear light harness connector?

bd:
You didn't mention whether you checked for the correct bulbs and the filament integrity.  Verify the lamp grounds and ensure the bed is grounded to the frame.  Check the wiring harness for melting, abrasion, pinching, and/or severing where it passes over the rear axle near the exhaust pipe; the harness plastic retaining clips fail, allowing the harness to sag or fall away from the frame toward the exhaust.

Regarding the dash lights, see Diagnosing Inoperative Dash Instrument Lighting.

For reference: 1986 GM Wiring Manual

SFR7771:
No power at rear on anything but left blinker, no power marker lights. Bulbs are correct...

bd:
Verify power on the rear lamp wire harness where it exits the firewall bulkhead connector along the driver (left) side of the connector.  If you have power there the fault is rearward.  Typically, the rear lamp wiring runs through corrugated loom along the left frame rail.  Wire damage/separations can be difficult to locate when hidden inside the loom.  Be patient.

If there is no power through the bulkhead connector, use the diagram of the headlamp switch connections (previously linked) to test power through the pins of the switch.

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