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Thread: What would cause the 150 Mega fuse to blow?

  1. 6th November 2013, 11:20 AM #1
    Discotrip Guest

    What would cause the 150 Mega fuse to blow?

    Hi,

    Finally getting through some issues on my D2. The engine is quiet and running like it should, except the main 150A mega fuse blew a couple of days ago. I just got the car back from the mechanic with a temporary 80A fuse which blew as we were pulling up. I'm waiting on a replacement and a spare from Element 14.

    My question is what would cause the 150A fuse to blow? The day it happened I tested the air suspension while the car was moving and figure it might have had something to do with the compressor. The compressor is working, and apparently the alternator is behaving itself too. Not sure what else could cause the short.

    Regards,
    Antony.
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  2. 6th November 2013, 11:22 AM #2
    Graeme
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    A chaffed heavy cable touching earth somewhere.
    MY21.5 L405 D350 Vogue SE with 19s. Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
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  3. 6th November 2013, 11:49 AM #3
    Discotrip Guest
    Yeah, I had a look but can't see anything touching or that might be causing it. Not sure if these are just known to blow after some time or what. Since it's a 150A, I imagine there must be quite a bit of current going through there anyway.
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  4. 6th November 2013, 12:32 PM #4
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    Rok_Dr
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    To blow that fuse means you have a big short somewhere... Only other thing I can think of is the starter motor.

    Cheers

    Steve
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  5. 6th November 2013, 12:36 PM #5
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    Petetheprinta
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    Quote Originally Posted by Discotrip View Post
    Hi,

    My question is what would cause the 150A fuse to blow?.
    160A...sorry...sorry, couldn't resist it
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  6. 6th November 2013, 03:32 PM #6
    Discotrip Guest
    Smart guys on here it seems!
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  7. 6th November 2013, 05:13 PM #7
    Discotrip Guest
    Would anyone happen to know the amperage that regularly gets used along that fuse? It blew the 80A temp fuse today but I don't know if that's the issue repeating itself or whether it regularly exceeds 80A on a normal basis.

    Guess will have to see tomorrow, although at $12 a go excluding postage I don't want to keep popping them! Not sure if there is any way to connect a multimeter or something that records the usage while I'm driving?
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  8. 6th November 2013, 07:09 PM #8
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    Judo
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    Quote Originally Posted by Petetheprinta View Post
    160A...sorry...sorry, couldn't resist it
    DAMN IT. I was going to reply 151A.


    Also, I would definitely not use a multi meter to check current that high. I would expect to see things melting, smoking and possibly fireworks if you try.
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  9. 6th November 2013, 07:25 PM #9
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    Sounds like something is wrong there - it shouldn't blow an 80amp fuse in normal service either. Did it blow straight away, or after some time? If it is drawing that much current, I would have thought the cause would be easy to see - you aren't far off letting the smoke out and causing a fire.
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  10. 6th November 2013, 07:47 PM #10
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    bee utey
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    Quote Originally Posted by Discotrip View Post
    Would anyone happen to know the amperage that regularly gets used along that fuse? It blew the 80A temp fuse today but I don't know if that's the issue repeating itself or whether it regularly exceeds 80A on a normal basis.

    Guess will have to see tomorrow, although at $12 a go excluding postage I don't want to keep popping them! Not sure if there is any way to connect a multimeter or something that records the usage while I'm driving?
    Any decent electronics shop should be able to sell you a current shunt that you place into the circuit, then read the current remotely. Most shunts are rated so that their design current shows up as a 75mV voltage across them.

    examples

    Current Meter 100 AMP Analog Shunt Centre Zero Charge Discharge 12V 24VDC 100A | eBay

    Current Panel Meter 200 AMP Analog Round Shunt Display Solar 200A 12V 24V DC | eBay

    Oh and if you're blowing fuses fit a circuit breaker instead:

    150A DC Circuit Breaker High Current Isolator 150 AMP Surface Mount Single Pole | eBay
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