FRAMING JOHN DELOREAN - ON VOD www.framingjohndeloreanfilm.com
Page 2 of 2 FirstFirst 1 2
Results 11 to 14 of 14

Thread: Solid state AUX relay

  1. #11
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    8,354

    My VIN:    03572

    Just for your info. I'm measuring the conduction resistance so you can calculate the heating produced by any load current. I pump 5 amps through the load and measure the voltage drop in millivolts from the power pin to the load pin.

    Well it looks like those 85 amp lugs I used on the AUX relay really make a big difference in resistance (voltage drop). I tested three pined relays with the same setup and got the following.

    My solid state headlight relay resulted in 2.02 milli-ohms.

    A standard TYCO 30 amp relay resulted in 13.4 milli-ohms.

    A BEULER 40/60 amp relay resulted in 5.6 milli-ohms.

    My AUX relay resulted in 0.50 milli-ohms.

    So lets plug a 30 amp load onto each relay and compute the watts of heat it produces. This is not adding the heat produced by the coil power in standard relays which runs about 1 watt.

    Headlight relay = 1.818 watts
    TYCO relay = 12.06 watts
    BEULER relay = 5.04 watts
    My AUX relay = 0.45 watts
    Dave M vin 03572
    http://dm-eng.weebly.com/

  2. #12
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    8,354

    My VIN:    03572

    I got my 60 amp supply repaired and just ran the resistance check at 40 amps just to verify my old 5 amp check was correct. This also gives me more resolution.

    My AUX relay resulted in 0.4935 milli-ohms.

    So the resistance is resulting the same testing at 5 amps or higher amps.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #13
    Member mhanch's Avatar
    Join Date:  Sep 2019

    Location:  Renton, WA

    Posts:    63

    My VIN:    10332

    Club(s):   (PNDC)

    So dave - this makes me think - is there any reason to proactively replace the current AUX relays with something more modern in general? Would that perform any better in the system or is it not really needed?

  4. #14
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    8,354

    My VIN:    03572

    Quote Originally Posted by mhanch View Post
    So dave - this makes me think - is there any reason to proactively replace the current AUX relays with something more modern in general? Would that perform any better in the system or is it not really needed?
    This is just to reduce some heat generated in the relay compartment. The OEM relays don't fail much.
    Dave M vin 03572
    http://dm-eng.weebly.com/

Page 2 of 2 FirstFirst 1 2

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •