Alternator getting hot

Discussion in 'Sparky's corner' started by CJay, Apr 29, 2019.

  1. BUICKRAT

    BUICKRAT Got any treats?

    Twice time' a charm. Just put a new tank and sender in mine, gauge went way past full. Pulled it down again, had to replace the little 90 degree connector to the sender, seems the old sender still had the stuck internal remains on it.
     
  2. Brett Slater

    Brett Slater Super Moderator Staff Member

    The piece of crap remanufactured alternator I got from the local parts store was whistling and whining when I installed it.

    Then, after not driving the car for a couple weeks, I grab it the other morning to bring it to work and there's an 8 inch diameter maroon-ish puddle under the car. The alternator boiled my battery!

    Changed the voltage regulator and put the multimeter on it today. It hovered around 14.00 and then spiked to about 16.50. And man, did it stink!

    I'm waiting on the correct, date coded one I sent to Stellar last week.
     
  3. stellar

    stellar Well-Known Member

    Brett, I think you may have a bad battery. The 4 most common reasons for overcharging are defective alternator, defective regulator, bad grounds, bad battery. If the battery wasn't bad before, it probably is now. Did it smell like rotten eggs or sulphur? If so the battery is probably cooked. Check the grounds and change the battery and retest.
     
  4. Brett Slater

    Brett Slater Super Moderator Staff Member

    The alternator hasn't sounded right since the get go but I was so glad go be back in action, I kinda overlooked the whistling and whining. Shame on me.

    As for smell, it was like hot wires. The whining would come and go and be especially prevalent while driving.

    Also, the GEN light stays on now. This is new and happened after changing the regulator. Poor ground, perhaps? I did have to bend the strap a little to fit the socket on. I've ordered a new one.

    The light did go off for a bit driving home but came back on and stayed on for the rest of the ride.

    I'll wait until I get my alternator back and top off the battery before doing anymore testing. The car used up enough of my patience yesterday.
     
  5. stellar

    stellar Well-Known Member

    what kind of regulator are you using? Mechanical or solid state?
     
  6. Brett Slater

    Brett Slater Super Moderator Staff Member

    AC Delco that's bolted to the firewall.

    So, an OEM one.
     
  7. bostoncat68

    bostoncat68 Platinum Level Contributor

    hey @Brett Slater it looked good when I saw it! I must admit that I hate high volume reman parts as it seems like they are more trouble than they are worth... 75% of the time it seems like there is some snafu...
     
  8. Brett Slater

    Brett Slater Super Moderator Staff Member

    Thanks! Nice to meet you and your wife.

    Thankfully, you weren't there to hear it whining. :rolleyes::rolleyes:
     
    bostoncat68 likes this.
  9. bostoncat68

    bostoncat68 Platinum Level Contributor

    Brett Slater likes this.
  10. BRUCE ROE

    BRUCE ROE Well-Known Member

    Gauge past full usually means an open circuit some where
    along the wire from the gauge to the tank sender, or from
    the tank unit ground wire to the body. Also an open sender
    is possible. Just try grounding near the gauge and note it
    going to E. Keep moving down the path, no effect means
    you just passed the open circuit. Bruce Roe
     

Share This Page