Bad Alternator???
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Thread: Bad Alternator???

  1. #1
    FRESHMAN ROVER
    Join Date
    July 28th, 2016
    Location
    Missouri
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    16

    Bad Alternator???

    I had my 1990 rrc idling in the driveway last week and had the pleasure of watching all the lights slowly dim and the engine slowly die. Obviously the alternator.

    Today I replaced the old/original alternator with a rebuilt one. Got everything hooked up and jumped to start, yet she died about 5 minutes later in the same way. I tested the amps at the alternator and it seems to swing between 0-75 (alternator is a 100). The tachometer also does not work consistently when revved in neutral.

    Have I definitely been sent yet another bad alternator?? Or could there possibly be another issue?

    Please help,
    Alec

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  3. #2
    Moderator RRToadHall's Avatar
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    Re: Bad Alternator???

    Ouch. Certainly sounds like a faulty unit. Was this a local purchase or through a Rover supplier?

    If it was local have them test it/replace it. If it was through a supplier give them a buzz and see what their return policy is.

    Was your battery fully charged when installed the new alternator? If not give a good long charge. Then run through the electrical troubleshooting stickie above. The series of tests in the stickie will test battery, alternator and cables.
    "The power of good is always stronger than the power of non-good.
    The power of light is stronger than the power of darkness,
    the power of knowledge is stronger than the power of ignorance."
    ~ Maharishi Mahesh Yogi~

  4. #3
    FRESHMAN ROVER
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    July 28th, 2016
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    Missouri
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    Re: Bad Alternator???

    Well, I ran a few test. Voltage with engine off seems to be around 12.2. Idling is around 13.1 and @ 2000rpm the voltage will rise to around 14 but fall back to around 13 quite often. The tachometer is working quite sporadically so maybe this is a result of me not keeping rpms consistent enough? Finding a consistent amp reading at the alternator is impossible, it swings between 0 and 75 at idle.

    As the battery approaches death, revving up the engine causes lights to dim and flicker at a faster pace. Death also seems to come quicker when revving the engine rather than idling. Maybe this is normal? But I found it rather strange.

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  6. #4
    SOPHOMORE ROVER
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    July 13th, 2008
    Location
    Upstate NY
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    306

    Re: Bad Alternator???

    sounds like the replacement unit is faulty to me as well but I have to ask, you're certain that you tightened the belt and it's not slipping?
    1990 Range Rover
    1995 Range Rover LWB
    2006 Range Rover
    2004 Discovery 2

    http://www.roverparts.com/News/archi...verSurgery.cfm
    http://www.defendersource.com/forum/...irs-60356.html

  7. #5
    FRESHMAN ROVER
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    July 28th, 2016
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    Missouri
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    Re: Bad Alternator???

    Yes, that belt is as tight as can be. I would kill for it to be that simple.

  8. #6
    FRESHMAN ROVER argyle219's Avatar
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    December 6th, 2014
    Location
    Orlando, FL
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    Re: Bad Alternator???

    Does the battery light light up on your instrument cluster if not that may be your issue if the alternator is good. For some reason Land Rover made that light part of the charging circuit and if that bulb blows your alternator will not put out voltage. The bulb has a red base as compared to the black ones for the rest of the lights. Not sure if that is true for all classics but it was for my 1988 m.y.


    Sent from AutoGuide.com Free App

  9. #7
    FRESHMAN ROVER
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    Re: Bad Alternator???

    Unfortunately, this light is working very well. I've had the joy of seeing it quite often recently :,(

  10. #8
    FRESHMAN ROVER
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    May 20th, 2009
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    phx/flg
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    Re: Bad Alternator???

    Not a unique problem. In fact I had the same trouble on my 1990. I turned my core in and got a new alternator from AZ. It didn't work but now my core is gone. So I try another from AZ. still no good. The problem is, as I have posted many time, the diode pack. I was lucky and got another core and took it to a rebuilder who freshened the core and put in a new diode pack. I sourced the pack on line. Problem resolved. Ialso lost an alternator on my 95lwb. again ordered the right diode pack and had it rebuilt. Still fine.

    I just remember, there is a tutorial online that show how to change the pack yourself. I don't know where it is, start looking!

    good luck
    geneo

  11. #9
    FRESHMAN ROVER
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    Re: Bad Alternator???

    here's a piece I had saved.

    Just a heads up for everyone as I am going through this now (squealing, burning belts and intermittent tach operation) even after a rebuild. I've just had it with the Marelli's.

    Ready to go for $95.95 delivered from these folks. They have the higher amp models as well for slightly more...(fast reply and very friendly) -

    "We can supply the 105 amp alternator (re-clocked) with 4 groove pulley for $74.00 + $9.95 for the pigtail (with all 4 wires) + $12.00 for shipping = $95.95
    This should do it for you."

    Thanks, Mike

    Mike Lewis
    DB Electrical
    [email protected]
    800-753-2242
    Starters, Alternators and more for Cars, Trucks, Tractors and ATVs

  12. #10
    SOPHOMORE ROVER grnole's Avatar
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    April 6th, 2011
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    Stamford CT
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    Re: Bad Alternator???

    i 2nd LWBblue, I purchased a unit for a p38 (105amp) and swapped the pulley from the existing unit. Hookups and mounts were the same on the 95. Unsure about earlier models.... Just saying I was happy with my result.
    1995 4.2L RRC LWB Beluga Black Tan Leather 5" Rovertym lift

  13. #11
    Premium Member crazyguy's Avatar
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    October 28th, 2013
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    Palm Beach, FL
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    Re: Bad Alternator???

    I got two bad ones from autozone and I suspect my current one is at least part of the problem on my low idle.
    1990 RRC. 4.2 wearing green.

  14. #12
    SOPHOMORE ROVER miggit's Avatar
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    July 12th, 2014
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    Milton Keynes UK
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    Re: Bad Alternator???

    Just a word to the wise.. Alternators don't like totally flat batteries, as they tend to max the output current, I was told by a refurbishers to either charge the battery before starting, or, to leave the jump leads connected for 10 minutes after starting to help reduce the load on the new alternator... I haven't suffered a failed rebuilt unit since...
    ​Range Rover Classic 1988 Fueled by the Devil (2.4 VM Diesel)

  15. #13
    FRESHMAN ROVER
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    June 28th, 2016
    Location
    Reno NV
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    Re: Bad Alternator???

    Hope you got it sorted out. I recently had an Alt.issue and took the unit to Autozone. They tested it and I was able to definitively rule out that as the source of my problem(without buying a new one first). Fortunately for me after replacing a couple of connections and re grounding, she was back on the road
    92 Range Rover Classic
    03 Disco (gone but not forgotten)

  16. #14
    FRESHMAN ROVER
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    August 30th, 2018
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    4

    Re: Bad Alternator???

    I'm having this same issue, what connections and grounds did you check?

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