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Thread: (Newbie) golf mk5 1.9 TDI : losing all electric systems when left in the sun...

  1. #1
    Join Date
    Mar 2022

    (Newbie) golf mk5 1.9 TDI : losing all electric systems when left in the sun...

    Hi all, newbie here.

    I have a golf mk5 1.9 TDI 2004 with a very particular issue :

    • Car stays parked in hot sun for 2-3 hours
      • when started, car will run fine for 10-20mns
      • then electric systems go down one by one
        • A/C (only fan was active at the time, not A/C)
        • turn signals / stop lights
        • sometimes car radio (not always)
        • power windows
        • all dashboard light and screen

      • then finally the engine stalls... fun when you're on the highway...

    • If I try to start again : no power at all (dashboard lights and screen off) : nothing
    • If I wait one minute: dash lights come back, but the car can't start : starter stuttering (clack-clack-clack) like with a dead / weak battery
    • once I leave the car off for a few minutes (2-3), the car will start again and run for 5-10 mns
    • then the cycle starts again...

    This seems to only happen only when the car has been sitting in the sun...

    What I've tried so far:

    • I've checked as much as I could of the electric wiring, fixed a few messes the previous owner(s) did
    • checked and replaced any fuse that seemed in bad shape (found some that look slightly corroded, and one blown, with copper wire to "repair" it... )
    • checked light connectors and repaired / replaced when needed (one had a pin burnt : replaced the connector and soldered new wire with clean pin)

    I've done extensive research but couldn't find anything about it...

    Anyone has any idea ? going crazy trying to find the fault here !

    Much thanks!

    Last edited by evon; 21-06-2022 at 05:23 PM.

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