Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

battery charger backwards

Discussion in 'The Garage' started by jrsavoie, Feb 10, 2006.

  1. jrsavoie

    jrsavoie Registered Member

    Joined:
    Dec 22, 2005
    Posts:
    19
    Likes Received:
    0
    Location:
    east central illinois
    My son-in-law hooked up the battery charger backwards on his 95 gas Tahoe. It turns over but won't start. where should we start?
     
  2. diesel4me

    diesel4me 1 ton status Premium Member

    Joined:
    Jul 24, 2003
    Posts:
    17,568
    Likes Received:
    943
    Location:
    Massachussetts
    in the fuse box..

    Not sure on late model GM's,but many vehicles have a reverse polarity protection fuse or diode in the fuse box in case this happens while jump starting or installing a battery..thats where I'd look first..its possible to charge a battery "backwards",and now the positive post will actually be the negative..might need a new battery now too..:doah:
     
  3. jrsavoie

    jrsavoie Registered Member

    Joined:
    Dec 22, 2005
    Posts:
    19
    Likes Received:
    0
    Location:
    east central illinois
    from what I gathered he was in a hurry for work. Hooked the charger up, hit boost. hit the key and sparks flew but he doesn't know from where. They said they checked fuses but I doubt they had a tester. I forgot to ask. I'm just assuming now that I think about it that they checked them visualy.
     
  4. Leper

    Leper 1/2 ton status

    Joined:
    Feb 18, 2005
    Posts:
    4,437
    Likes Received:
    0
    Location:
    Dallas Baby!!!!
    It should have blown one of the main fuses. Worst case scenario... put your nose close to the ecm and see if you smell some fried electronics.
     
  5. goldwing2000

    goldwing2000 Guest

    Funny story: one time I put a charger on backwards to a battery that was completely dead and it actually put a reverse charge on it. :rolleyes:
    I had to kill it completely again and re-charge it the right way.

    But yeah... either a fuse or a diode. There might be something in the owner's manual or service manual (you DO have a service manual, right?)
     
  6. 89GMCSuburban

    89GMCSuburban 1/2 ton status

    Joined:
    Nov 15, 2001
    Posts:
    3,005
    Likes Received:
    0
    Location:
    Thornton, CO
    Does anything else not work in the truck? Like lights, windows, radio etc.? If so, check the fusible links off the starter. Your best option to start tracing the wiring is from the starter...so I'd start there first. Check all fuses if all the stuff inside works, ECM fuse being blown DEFINITELY won't let it turn over.
     
  7. jrsavoie

    jrsavoie Registered Member

    Joined:
    Dec 22, 2005
    Posts:
    19
    Likes Received:
    0
    Location:
    east central illinois
    Turns over but won't start. lights & radio are working
     
  8. goldwing2000

    goldwing2000 Guest

    Unless '94 is different than '89, that may not be true. My buddy blew the ECM1 fuse on his Blazer and it just killed the fuel system. It still cranked fine and everything worked normally (other than the fuel pump).
     
  9. 89GMCSuburban

    89GMCSuburban 1/2 ton status

    Joined:
    Nov 15, 2001
    Posts:
    3,005
    Likes Received:
    0
    Location:
    Thornton, CO
    Turn over means start. Cranking is something else.....
     
  10. goldwing2000

    goldwing2000 Guest

    Start means start.

    Turn Over = Cranking, as in the crankshaft is turning over whether or not the spark plugs are firing. As the very first (and 7th) post says, "It turns over but won't start"

    If an engine won't turn over, then it won't spin. Either because the starter is not engaging or the engine is locked up.
     
  11. jrsavoie

    jrsavoie Registered Member

    Joined:
    Dec 22, 2005
    Posts:
    19
    Likes Received:
    0
    Location:
    east central illinois
    Might all depend on where your from.Though I thought that was a universal terminology. I'm closer to Michigan.
    Thanks for all the advice. I'll let you know how things progress.
     

Share This Page