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Technical Relays

Discussion in 'Traditional Hot Rods' started by cammer8, Jan 13, 2020.

  1. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,018


    Depends on the switch!

    VANDENPLAS likes this.
  2. Hemi Joel
    Joined: May 4, 2007
    Posts: 821

    Hemi Joel
    from Minnesota

    On cars I drive at night, I like to use relays. It makes the headlights brighter. With the headlights on and the engine at a high idle, measure voltage at the alternator or generator. Then measure voltage at the bulbs. I have measured as much a 4.75 volt drop. If you are losing more than 2 volts, you will for sure notice brighter lights with properly wired relays.
  3. leon bee
    Joined: Mar 15, 2017
    Posts: 482

    leon bee
    from Arkansas!

    What is a relay? Is that them little things make your fuel pump and other shit quit working?
    Boneyard51 likes this.
  4. morac41
    Joined: Jul 23, 2011
    Posts: 532


    Boneyard51 Your right but it's my preference to relay nearly everything..there's a lot more wire involved ..I've been building and using 8-10 relay looms in cars I built for myself and clients for 50 years..relays are very reliable and require little current to activate them
    Last edited: Jan 15, 2020
    Boneyard51 and Frankie47 like this.
  5. birdman1
    Joined: Dec 6, 2012
    Posts: 905


    Years ago I had a 1974 Audi fox. It had the Bosch electrical system with relays for everything. Was not uncommon for the headlines to go out because of poor relay connections. Had to pull over, wriggle the relay, and go on down the road
    Boneyard51 likes this.
  6. sevenhills1952
    Joined: Mar 14, 2018
    Posts: 930


    Initially cars were simple, over time complex, backup cameras, sensors, etc.
    Simplicity means less to fail. If a new car quits why even open the hood?
    I prefer simplicity, no fuseable links. A headlight switch will have a built in thermal breaker. I like glass fuses, proper gauge wire.
    I'd be thinking this: it's at night and my car quits. Do I want to walk, leaving it beside the road, or do I want something I can most likely get it going enough to make it home?

    Sent from my SM-S320VL using Tapatalk
  7. Boneyard51
    Joined: Dec 10, 2017
    Posts: 4,018


    I hear you. I’ve used relays a lot also and while I’ve had very little failure with the little Bosh type relays, I’ve encountered failure on other type of heavier duty relays. I still stand behind my advise “ use them when only when necessary “ . For me the less contacts and connections the better.

    morac41 likes this.

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