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Thread: P38 alternator - upgrade for GEMS

  1. #11
    Join Date
    May 2010
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    Mindarie, Western Australia
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    So all we really need is more smoke?

    Gary

  2. #12
    Join Date
    Feb 2013
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    Gosford, NSW, Australia
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    Quote Originally Posted by mtb_gary View Post
    So all we really need is more smoke?

    Gary
    Or a way to keep the smoke in

    "On a more serious note it seems Magneti Marelli alternators, apparently a Lucas design are more prone to failure from overheating and "losing their smoke" than eg ones made by Bosch."

    I still intend to measure the Bosch Alternator for you as well !

    Steve

  3. #13
    Join Date
    Feb 2013
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    Gosford, NSW, Australia
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    I finally have a little time to document some of what I found during my research;

    My MY96 had a 150 amp alternator (supposedly from a classic) fitted and it seemed good though I got an alternator fault message on the dash.

    It started to get very noisy so I got a new 120 amp one and fitted it.

    I eventually got around to replacing the bearings in the 150 version and refitted it to the car. It definitely held the voltage a little higher. However one of the new bearings decided to fail after a couple of weeks

    So it was back on with the 120 amp version! But about 2 weeks later my voltage started to flick very high, up 1to 16v So a dead regulator in that one. I then took the regulator our of the 150 amp one and put it in the 120 amp one and it worked fine! Whew.. now all I have to do is replace those bearings again

    Details follow, note the regulator is physically the same so I was able to fit the Transpo IX123 regulator to the Marelli but that does not make it a 150 amp alternator

    The 150 amp alternator uses Transpo rectifier and regulator and different stator windings as well I imagine.
    Transpo IX123 regulator
    Transpo IXR642 rectifier 6 x 50a; 300A
    The casings are marked 4135 and 4136 but I can't see any other markings on them

    The Marelli 120 amp (Denso DAN 016) uses
    Marelli RM2000.05 regulator
    Marelli 63624201 rectifier

    There are transpo versions of these as well
    Transpo IX124 regulator for Marelli
    Transpo IX638 rectifier for Marelli 6 x 40A; 240A

    A little about transpo here
    https://alternatorparts.com/transpo-...formation.html

    These guys are listing a 200 amp alternator !!

    Land Rover Range Rover High Output Alternators

    Might check those out in the future!

    Steve

  4. #14
    Join Date
    Feb 2010
    Location
    Townsville, QLD
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    Those high output alternators look very tempting!

    2002 P38 Range Rover HSE

    Sequential LPG - Redarc Charger - TPMS - Ashcroft Locker
    Wheel Carrier - Bullbar & Spotlights - 285/75/16 BFG KM3’s
    On Board Solar - Stainless Snorkel - 2” Suspension Lift

  5. #15
    Join Date
    Feb 2013
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    Gosford, NSW, Australia
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    Quote Originally Posted by Keithy P38 View Post
    Those high output alternators look very tempting!
    I agree mate !

  6. #16
    Join Date
    Dec 2015
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    Ballarat ,Australia
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    Curious as to what amp rating were used on the UK Police P38??

    Sent from my A1601 using AULRO mobile app

  7. #17
    Join Date
    Feb 2013
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    Gosford, NSW, Australia
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    I think I am going to go for one of these fairly soon

    Land Rover Range Rover 1995 1999 4.0L 4.6 160 HIGH AMP NEW Alternator /Generator | eBay
    Steve

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