1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

New problem, ampmeter spiked

Discussion in '40- & 55-Series Tech' started by burnt03, Jun 1, 2003.

  1. burnt03

    burnt03

    Messages:
    259
    Likes Received:
    1
    Joined:
    Oct 1, 2002
    Location:
    Peachland, BC, Canada
    Have the truck running again, but now the ampmeter in the gauge cluster stays pretty close to the +30 mark when the truck is accelerating (stays pretty central when idling though)

    What's my problem here??

    Thanks
     
  2. Pin_Head

    Pin_Head

    Messages:
    13,747
    Likes Received:
    1,316
    Joined:
    Feb 6, 2002
    Location:
    OC, CA
    Bad battery?

    If not, it is something wierd.
     
  3. Eternal

    Eternal

    Messages:
    247
    Likes Received:
    0
    Joined:
    Jan 3, 2003
    Do you have the original alternator in here. If not mine does that I have a chev alt in there and it can't read the amps correctly. Spikes while accellerating an level when Idling. If not don't know.

    Eternal-in the dog house....again
     
  4. CruisinGA

    CruisinGA

    Messages:
    6,163
    Likes Received:
    8
    Joined:
    Mar 27, 2003
    Location:
    Georgia Tech
    Either what pinhead said, maybe volt reg? Those normally do the opposite though. Its sure not anything normal other than bad battery or bad volt. reg. &nbsp:Do you have a manual? My haynes has got a ton of alternator/charging system troubleshooting methods. Might want to run through those.
     
  5. burnt03

    burnt03

    Messages:
    259
    Likes Received:
    1
    Joined:
    Oct 1, 2002
    Location:
    Peachland, BC, Canada
    Cool, thanks guys

    Just didn't want to worry about frying the coil or starting something on fire on the way to work today
     
  6. CruisinGA

    CruisinGA

    Messages:
    6,163
    Likes Received:
    8
    Joined:
    Mar 27, 2003
    Location:
    Georgia Tech
    I didn't say you wouldn't fry anything!
    30 amps flowing into your battery when its not needed is not good. Might want to get out the multimeter and see if there really is 30 amps flowin out of the alternator, maybe something is lying to you.
     
  7. arutgers

    arutgers

    Messages:
    88
    Likes Received:
    0
    Joined:
    Mar 30, 2003
    Location:
    Annen, the Netherlands
    I had the same a year ago, which is bad for the battery. Cause was a bad voltage regulator. It is possible to adjust the (mechanic) regulator according to the engine manual. But I replaced my old regulator with an electronic type. Works fine now.

    Ton
     
  8. burnt03

    burnt03

    Messages:
    259
    Likes Received:
    1
    Joined:
    Oct 1, 2002
    Location:
    Peachland, BC, Canada
    Whereabouts in the truck is the regulator located? ('78 FJ40)
     
  9. CruisinGA

    CruisinGA

    Messages:
    6,163
    Likes Received:
    8
    Joined:
    Mar 27, 2003
    Location:
    Georgia Tech
    I'm a '74, it may be the same, its mounted to the engine side of the firewall, stand next to the DS front tire and look under the brake/clutch master cylinders. Black nondescript metal box with a 3 wire plug, sticks out about 3 inches from firewall, 1.5 inches wide, about 3.5 inches long. Since your's may have the ps mounted alt. not sure where your volt. reg is.
     
  10. CruisinGA

    CruisinGA

    Messages:
    6,163
    Likes Received:
    8
    Joined:
    Mar 27, 2003
    Location:
    Georgia Tech
    Here's a pic. Kinda close up but should give you an idea. Napa has it, $20-30. If I were you I would try the solid state swap listed in Tech while you're at it. Less fluctuation, more sensitive, temperature senstive as well.