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Relays for brighter headlamps

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ryan22re, Jul 25, 2005.

  1. ryan22re

    ryan22re 1/2 ton status

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    last year i added two relays to my 87 and man what a difference. i used two relay kits from gm (actually its a starter relay recall part) part # 22694036, which is a relay with a short wiring harness use part # 88880045 for a longer harness. i used the original power wires to the low beams to energize the relays, and used some heavier wire run from juction block on the firewall to power the head lamps. i also ran heavy gauge wire from the low to high beam. i went from around 11.8-11.9 volts at the lamps to about 14.0 volts. the difference was amazing. dont have the part numbers of the terminals i used to attach the heavy gauge wire to the headlamp connectors, but i could get it if any one is interested. could also draw a wiring diagram. total cost was around $40.

    ryan
     
  2. J.R.

    J.R. Guest

    i would be interested in a write up and diagram on what you all did!! thanks
     
  3. pos727

    pos727 Newbie

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    I second that. Thanks
     
  4. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    i would do this as well.
     
  5. ryan22re

    ryan22re 1/2 ton status

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    ok guys am working on diagrams part #s and some digital pics.

    i'll probably do diagrams for both single and dual headlamps.

    ryan
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Is this what you are talking about doing?
     
  7. ryan22re

    ryan22re 1/2 ton status

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    yes thats what i am talking about.

    ryan
     
  8. ryan22re

    ryan22re 1/2 ton status

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    but the way that i did it only requires two relays and will keep the low beams on while the high beams are on. the way i read that diagram, it is really written for just single lamps.

    ryan
     
  9. R72K5

    R72K5 Banned

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    why is stock voltage lower than 14 in the first place ? GM have a reason or is is due to resistance of the stock wiring ??

    hmm..
     
  10. ryan22re

    ryan22re 1/2 ton status

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    it is due to the small gauge wire and the length of the wires.

    ryan
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    Yep. You'll typically see at least a .5-1V drop at the fuse panel alone from alternator output voltage. When factoring in all the other connections/wire between the firewall and the headlights (light switch, etc) I can imagine quite a bit less.

    Easy enough to test, check voltage at the alternator with the headlights on, then pull a headlight plug and test voltage there.
     

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