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  1. H

    Alternator failing to produce power until revs rise

    :) Thanks guys. All fixed with a fortnight's testing completed . The resister and diode were wired in externally with a heat sink attached . The ignition lights extinguish immediately on startup . Good result
  2. H

    Alternator failing to produce power until revs rise

    The parts arrived today and were installed . The warning lights extinguish and the alternator produces power at startup . There are 3.75 volts in wire "L" with the ignition on before the motor is started . The resisitor became warm to the the touch after a minute or two . I left it outside the...
  3. H

    Alternator failing to produce power until revs rise

    Thanks for the advice guys .Keep it coming .I am learning as I go and having a bit of fun with it too. Electronics is a real gap in my knowledge . I am (was) a fitter-machinist/welder . With your help and Youtube I feel I'm improving my personal data base. :) I understand now why flashing the...
  4. H

    Alternator failing to produce power until revs rise

    Sure thing . I had to order the parts off Ebay . The electronics store is gone .....maybe a Covid Closure , so it will be a few days until they arrive . Interestingly , I applied 12v to wire "L" from the 12v sub-system I run in the truck , and it was enough to excite the rotor . The warning...
  5. H

    Alternator failing to produce power until revs rise

    Good advice there Peg . How many times does it happen you pay good money to a "tradesman" and end up doing it yourself ? I could tell a story about a wheel alignment professional who put the castor correction wedge under the back of the axle instead of the front and had the vehicle steering...
  6. H

    Alternator failing to produce power until revs rise

    I spoke to the autolec this morning . He said the rectifier assembly is one solid state unit and unavailable . The fix will have to parallel the existing circuit as pc1966 suggested , which can be easily done externally . There is an electronics store in town with loose components available . I...
  7. H

    Alternator failing to produce power until revs rise

    I will talk to the auto lec tomorrow about the internal configuration of the alternator . I didn't pull it to bits so have no idea of it's construction
  8. H

    Alternator failing to produce power until revs rise

    After studying the circuit I think the problem lies after the IG connection enters the alternator . Either the diode or the resistor is open circuit . Current should move through the diode and resistor and the reduced voltage thereafter energises the rotor . This reduced voltage should be...
  9. H

    Alternator failing to produce power until revs rise

    I got hold of the relevant wiring diagram and have found the Charge Light Relay which appears to be working .
  10. H

    Alternator failing to produce power until revs rise

    I will do as suggested guys . Now I have a logic trail to follow knowing that the fault has nothing to do with the alternator .
  11. H

    Alternator failing to produce power until revs rise

    Thanks very much people :) I tried putting a resistor in series with the charge light wire with no result . The lights stayed on until the engine hit 3000 rpm . I next wired up the alternator direct from the batteries with the plug out of the equation . An 8 ohm resistor used to simulate the...
  12. H

    Alternator failing to produce power until revs rise

    Thanks for the replies people . Yes, the alternator is original installation .The pulley ratios look about 1 to 3 . Motor to alternator. I will wire the alternator up directly using more resistance in the warning light circuit and get back to you . HJ61 Peg. The vehicle was a grey import to...
  13. H

    Alternator failing to produce power until revs rise

    The auto lec has seen the installation . Cables good . The batteries are good . The earth between the alternator and the vehicle shows no resistance . I thought maybe that the current through the connecting plug may be passing through a dodgy relay so I wired direct from the batteries to test...
  14. H

    Alternator failing to produce power until revs rise

    Hi people . My first post . I have a 1989 turbo diesel Landcruiser with a 24 volt system . The alternator , for many years has needed to be spun up before it began to produce power and the dash lights extinguished . About 1250 engine rpm or three times that for the alternator . Recently it would...

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