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Thread: Alternator problem

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    Patrol God Stropp's Avatar
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    Alternator problem

    Recently had a 130amp Bosch alternator fitted and now I get battery, sub tank and handbrake light flash on, checked the ground and voltage is 13.8 when idling, obviously the bloody lights donít flash when the meter is on it, I suspect the new alternator is on way out however they wonít cover it with warranty until it shits itself. Am I right in thinking alternator?
    2003 gu3 td42tdi roaming this great country

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    Patrol God mudnut's Avatar
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    All connections good? Battery terminals clean and tight? Was there any modifications to the wiring harness to fit the new alternator. Sorry Strop, I can't remember which Patrol you have. If it has an ECU or ECU controlled alternator, maybe it needs to be reset? No fuses have blown?
    Last edited by mudnut; 2nd June 2022 at 11:21 PM.
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    Patrol God Stropp's Avatar
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    Quote Originally Posted by mudnut View Post
    All connections good? Battery terminals clean and tight? Was there any modifications to the wiring harness to fit the new alternator. Sorry Strop, I can't remember which Patrol you have. If it has an ECU or ECU controlled alternator, maybe it needs to be reset? No fuses have blown?
    Td42tdi 2003 so not ecu, Iíve checked everything even cleaned to earths and checked the battery terminals, only thing new is the sparky remade the wiring harness for the spotties as it was too light he said
    2003 gu3 td42tdi roaming this great country

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    Patrol God mudnut's Avatar
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    I think you need to take it back to the eleccy and get them to recheck their work. A pain in the arse but maybe they cut a wire or there is a crook crimp on a lug, especially if the fault is intermittent. Copper can work harden on a vehicle, due to vibration, so if a loom was bent, it may have broken a wire which is now only just touching.

    Try turning the headlights, spotties, wipers fan and radio on and see how the alternator copes with a bit of load. Get someone to rev the engine above 1500rpm and measure the voltage output.

    Use a the handle of a screwdriver and tap in and around the loom, alternator, fuses and battery, to see if the voltage changes.
    Last edited by mudnut; 3rd June 2022 at 01:35 PM.
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    Quote Originally Posted by Stropp View Post
    only thing new is the sparky remade the wiring harness for the spotties as it was too light he said
    Well the sparky was the last to touch the vehicle so its his fault!!! Thats how it works doesn't it?

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    Patrol God Stropp's Avatar
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    Sparky did the light harness but my mechanic did the alternator change, itís a bit weird the warning lights were lashing on the way up to Jurien bay then when we slowed down it stopped flashing fuk nose
    2003 gu3 td42tdi roaming this great country

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    Patrol God
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    Stropp.
    You're saying at idle you're getting 13.8v and no flashing lights.
    Also no flashing lights when slowed down ...

    Just thinking out loud , but would the lights flash due to over voltage ?? At speed revs are higher so volts are higher. Yours might be too high?
    Checked volts at high revs???
    2005 TD42TI

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    I'm a bit over warning lights myself. My dirtbike doesn't have any warning lights and seems to work fine so long as it has fuel, coolant, oil, etc.
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    Factory snorkel, flashlube catchcan pro, 3" manta exhaust, hpd boost controller, dyno-tuned & egr deleted, 2x dual batt systems, 3 batteries, arb bullbar, cheap HIDs, stock lift/tyres, rear helper airbags

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    Patrol God Stropp's Avatar
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    Quote Originally Posted by Hodge View Post
    Stropp.
    You're saying at idle you're getting 13.8v and no flashing lights.
    Also no flashing lights when slowed down ...

    Just thinking out loud , but would the lights flash due to over voltage ?? At speed revs are higher so volts are higher. Yours might be too high?
    Checked volts at high revs???
    Now itís not doing it, think Iíll take it to the auto sparky to check
    2003 gu3 td42tdi roaming this great country

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    Hodge (4th June 2022), MB (5th June 2022)

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