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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: 4wdmemes on September 30, 2021, 09:54:25 PM

Title: No Headlights, Taillights, Horn, or Gauges
Post by: 4wdmemes on September 30, 2021, 09:54:25 PM

Hello all, today I started up my 1984 K10 LWB and noticed that I have no headlights, taillights, sidemarkers, interior lights, or horn. Although when I press the brake, the brake lights work, so no burnt bulb. And the turn lamps work when I use the turn signals. Any help is appreciated, 1984 diagrams would especially be helpful. ;D

Title: Re: No Headlights, Taillights, Horn, or Gauges
Post by: bd on October 01, 2021, 10:56:47 AM

The 1984 Wiring Manual (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/X8430_1984_GMC_CK_Light_Duty_Trucks_Wiring_Manual.pdf) is available along with all the other manuals in our Technical Forum (http://forum.73-87chevytrucks.com/smforum/index.php?topic=30115.msg252586#msg252586).

Number 1157 (and the subsequent 2057) bulbs have dual filaments.  The brake/turn signal lamps and running lamps employ separate filaments within the bulbs.  So bad bulbs remain a possibility until physically verified.

Using an incandescent test light, is the alternator #2 regulator terminal constant 12 volts?  Check the fusible links and connections to the starter solenoid 3/8" B+ stud.

Title: Re: No Headlights, Taillights, Horn, or Gauges
Post by: Susipfm on May 29, 2022, 08:55:16 AM

I am having the same issue, I found a cab to frame ground strap broken, ordering a new one to see if that is the problem, I'll keep you posted

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