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Thread: LS1 PCM wiring

  1. #11
    Registered Member 55 Rescue Dog's Avatar
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    Quote Originally Posted by chevynut View Post
    There you go again with your BS. Did I say you never need a relay? No, I didn't, but as usual you try to twist and distort what people say and put words in their mouths. I have relays where I NEED them.

    So I'm guessing your car has relays everywhere, even where they're not needed and you just run small wires and use relays for every device?

    You don't need a relay when the load is small and a switch can handle it. You use relays where you NEED them, either for logic functions (such as AND/OR) or to carry high loads. The backup light switch on a T56 is meant to break the circuit to the backup lights, not to run a relay. That's how it's wired on cars that have them because the load is small and the switch can handle the current. And with LED lights you surely don't need a relay.

    Assuming that they are LED's, and not 100 watt back-up lights which would be awesome. No BS
    Last edited by 55 Rescue Dog; 08-11-2017 at 05:24 PM.

  2. #12
    Registered Member WagonCrazy's Avatar
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    Ok guys...I get both your direction here.
    I'm going to leave this one wired with the relay because 1) it was already there in the fuse panel and 2) wiring it as CNut suggests means 2 wires (total) passing thru the firewall instead of 1 as it's wired now. Normally, that wouldn't be a big deal but I already have nearly 70 wires passing thru now just for the engine-to-PCM stuff and the few other wires needed for the engine-to-gauges. So it's getting tight in that spot.
    CNut...I get what you're saying in your solution, and yes...that would work (to avoid the relay). Since it was already wired for the relay, I just chose to finish it up by putting that ground wire into pin 86 on the relay.
    Definately value your electrical engineer perspective on this though. I'm learning as I go...

    Now I have to see if I can get LED backup lights for a 57 Chevy. I like that option over the normal bulb style...

    Onward!
    1957 Nomad- LS1/T56 on C4 chassis- [URL=http://s78.photobucket.com/user/pcardey/library/57%20Chevy%20Nomad%20wagon[/URL]

    1959 Fleetside Apache 1/2 ton, shortbed, big window- [URL=http://s78.photobucket.com/user/pcardey/library/59%20Apached%20Fleetside%20Big%20Window%20Shortbed[/URL]

  3. #13
    Registered Member chevynut's Avatar
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    Quote Originally Posted by 55 Rescue Dog View Post
    Assuming that they are LED's, and not 100 watt back-up lights which would be awesome. No BS
    The stock backup lamps are 25 watts each, as I already explained above, and a fraction of that (about 2.5 watts each) if they were LEDs. What moron would put 100 watt bulbs in the backup light sockets?

    And besides, I'm guessing that BU switch can handle as much current as a relay. It probably CAN handle 100 watts.

    Paul, are you sure your car can handle all the extra weight of those unnecessary relays?
    Last edited by chevynut; 08-12-2017 at 12:46 PM.
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

  4. #14
    Registered Member 55 Rescue Dog's Avatar
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    Quote Originally Posted by chevynut View Post
    The stock backup lamps are 25 watts each, as I already explained above, and a fraction of that (about 2.5 watts each) if they were LEDs. What moron would put 100 watt bulbs in the backup light sockets?

    And besides, I'm guessing that BU switch can handle as much current as a relay. It probably CAN handle 100 watts.

    Paul, are you sure your car can handle all the extra weight of those unnecessary relays?
    Congrats, I'm pretty sure that you will win the trophy for the heaviest Pro-street Tri-five ever. I=E/R
    So what if you could see better with 200 watts of LED lights with only 1.6 amps of current which would be useful, instead of 4.16 amps with only the dim glow of 50 watts.
    Last edited by 55 Rescue Dog; 08-12-2017 at 03:52 PM.

  5. #15
    Registered Member WagonCrazy's Avatar
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    Just did a google search for 1957 chevy led backup lights and NOBODY MAKES THEM. Plenty of molded backup light assy's for 1955 and 1956 chevys, but nothing for a 57. Wierd...
    Guess I'll just stick with the filament style bulb for now....and swap to an LED bulb later on if need be.
    For the absolute lack of time those lights will be on, I think I can safely bypass the expense of anything more than standard (now old fashioned) filament style bulbs.

    Of course, I'm already over budget (and overweight) by one $8 Relay now...
    1957 Nomad- LS1/T56 on C4 chassis- [URL=http://s78.photobucket.com/user/pcardey/library/57%20Chevy%20Nomad%20wagon[/URL]

    1959 Fleetside Apache 1/2 ton, shortbed, big window- [URL=http://s78.photobucket.com/user/pcardey/library/59%20Apached%20Fleetside%20Big%20Window%20Shortbed[/URL]

  6. #16
    Registered Member chevynut's Avatar
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    Quote Originally Posted by WagonCrazy View Post
    Just did a google search for 1957 chevy led backup lights and NOBODY MAKES THEM.
    All you need to find is a single filament replacement LED bulb, it doesn't have to be made for a 57 Chevy.

    Here's one possibility that they say is for a 58 Chevy BelAir. They don't go back to '57 but I'm pretty sure it's the same, or equivalent.

    https://www.superbrightleds.com/more...ofit-car/1686/

    There are many other options for other car backup/turn/brake lights on the site. All you have to get is the correct base and wattage or lumens you want.

    https://www.superbrightleds.com/sear...ype,1156,1,40:
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

  7. #17
    Registered Member chevynut's Avatar
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    Here's another one that should work, and it's probably available locally:

    https://jet.com/product/detail/7e3a6...3-1f3879471222
    56 Nomad, Ramjet 502, Viper 6-speed T56, C4 Corvette front and rear suspension

    You can see my 56 Nomad build here http://www.picturetrail.com/chevynut

    For affordable C4 Corvette Suspension conversions for your car, visit http://www.classicedgedesigns.com

    Other vehicles:

    56 Chevy 2-door BelAir sedan
    56 Chevy 210 4-door sedan
    57 Chevy 210 4-door sedan
    1961 Willys CJ3B Jeep
    2001 Porsche Boxster S
    2003 Chevy Silverado 2500 HD Duramax

  8. #18
    Registered Member WagonCrazy's Avatar
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    Those will do the trick Laszlo. Thanks for doing the legwork to find them and posting the links.
    1957 Nomad- LS1/T56 on C4 chassis- [URL=http://s78.photobucket.com/user/pcardey/library/57%20Chevy%20Nomad%20wagon[/URL]

    1959 Fleetside Apache 1/2 ton, shortbed, big window- [URL=http://s78.photobucket.com/user/pcardey/library/59%20Apached%20Fleetside%20Big%20Window%20Shortbed[/URL]

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