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unexplainable flat battries 24v

For all things Electrical.

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unexplainable flat battries 24v

Post by GOT MUD »

hey for the second time in a row have had flat battries on the truck the first time was last sunday went to start it after not driving it for a while and they were flat pull started it and fine while i was driving volt meter showed 24v on gauge but at idle it droped to 20v which i thought was strange then 2nd time for flat bats was today i had not driven it all week but did start it at let it idle for a minute on friday nite but today absolutly flat by the wat the battries are only a month old anyone have any ideas i know i didnt leave any thing on please any help would be good before i burn the truck to the ground this 24v thing really gives me the shytes :bad-words:

cheers :x
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Post by wayne74 »

sounds like an alt prob it should be charging a little higher round 26 volts even at idle it should be higher then 20 .even check ya alt belt make sure it tight
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Post by GOT MUD »

yeah ive checked belts and the alt was done up about 4 months ago but it has done much driving since
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Post by RoldIT »

muduppig wrote:yeah ive checked belts and the alt was done up about 4 months ago but it has done much driving since
Take the ALT back and get it checked, should be way higher than 20v at idle (as stated earlier).
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Post by Doggy »

what 12v stuff if any do you have one there? When 12v gear is hooked up to one battery in a 24v circuit it will drain the weaker battery. My shorty safari does this and I only have my stereo on there, used to have amps and subs connected but found that they drained it waaaay to much. Mine will go flat about once every 2 months or so. I just got used to it and charge it up
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Post by murcod »

Don't hook up your 12v gear to one battery! I did that on a relations truck for his alarm and it stuffed the batteries (one overcharges and the other gets undercharged ;) )

Luckily they covered it under warranty......
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Post by GOT MUD »

i have cd uhf and am but none are hooked to one battery they were running though a converter before it died going to try and tap 12v from inside cab off cig lighter (also see nissan section)
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Post by ZAPPAGQ »

HAVE YOU TRIED TAKING ONE OF YOUR BATTERY LEADS OFF (WITH EVERYTHING OFF) AND PUT A MULTIMETER ON AMPS IN CIRCUIT YOU MAY FIND THAT SOMETHING IS DRAWING POWER THAT YOU DONT KNOW OF. ALSO IF THE ALTERNATOR DIODES ARE PLAYING UP THEY WILL ALLOW POWER BACK THRU FLATTENING YOUR BATTERY! jUST A THOUGHT I HAD THE SAME DRAMA ON MY ONE TONNER
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Post by ZAPPAGQ »

HAVE YOU TRIED TAKING ONE OF YOUR BATTERY LEADS OFF (WITH EVERYTHING OFF) AND PUT A MULTIMETER ON AMPS IN CIRCUIT YOU MAY FIND THAT SOMETHING IS DRAWING POWER THAT YOU DONT KNOW OF. ALSO IF THE ALTERNATOR DIODES ARE PLAYING UP THEY WILL ALLOW POWER BACK THRU FLATTENING YOUR BATTERY! jUST A THOUGHT I HAD THE SAME DRAMA ON MY ONE TONNER
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Post by RoldIT »

ZAPPAGQ wrote:HAVE YOU TRIED TAKING ONE OF YOUR BATTERY LEADS OFF (WITH EVERYTHING OFF) AND PUT A MULTIMETER ON AMPS IN CIRCUIT YOU MAY FIND THAT SOMETHING IS DRAWING POWER THAT YOU DONT KNOW OF. ALSO IF THE ALTERNATOR DIODES ARE PLAYING UP THEY WILL ALLOW POWER BACK THRU FLATTENING YOUR BATTERY! jUST A THOUGHT I HAD THE SAME DRAMA ON MY ONE TONNER
Have you tried turning your caps-lock off?
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Post by GOT MUD »

alts out taking back tommorow to get it checked did notice somthing rattling around in it :shock: see how it goes
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Post by GOT MUD »

ZAPPAGQ wrote:HAVE YOU TRIED TAKING ONE OF YOUR BATTERY LEADS OFF (WITH EVERYTHING OFF) AND PUT A MULTIMETER ON AMPS IN CIRCUIT YOU MAY FIND THAT SOMETHING IS DRAWING POWER THAT YOU DONT KNOW OF. ALSO IF THE ALTERNATOR DIODES ARE PLAYING UP THEY WILL ALLOW POWER BACK THRU FLATTENING YOUR BATTERY! jUST A THOUGHT I HAD THE SAME DRAMA ON MY ONE TONNER
this sound like an idea but which one would you take off in 24volt system :?:
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Post by murcod »

Doesn't matter which lead as they're in series. Just do the one to the chassis earth and put the multimeter in there.
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Post by GOT MUD »

cool thanks for that :D
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Post by GOT MUD »

Just a update on whats happening auto elec pulled apart the alt and found 2 burnt diodes. :shock: Which could be the reason for flat batteries as ZAPPGQ said. Have not got any clarafication(spelling) on why this could of happen, the auto elec was still having a go at me cause there was dirt in it :roll:when i was walking out. He is being really negative about the whole mq 24v thing saying they are shyte (sort of know that) but he even told me to throw the whole truck on dump pile (by the way hes never seen the truck just the alt) when i ask him about getting it more reliable, the electrical system thats is.
Anyway time to start taking it to another auto elec, i found one closer to home who seems to know whats going on he also does truck and earthmoving gear so he knows 24v stuff backwards.He also wasnt negative about my truck.I will hopefully get the alt back this arvo repaired by the first guy at no charge i think, cause he did the whole thing up a couple of months ago, then i stick with the new guy from know on.

rant over sorry :D
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Post by ZAPPAGQ »

Good to hear you are getting it sorted. There is nothing worse when talkin to a professional and all you get is negative!! Doesnt help the problem or the temper :twisted:
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Post by bilby »

get both ya batteries checked for a collapsed cell . it will drain the good one overnight if a couple of plates are rooted

had this happen in my GQ the aux. battery had 2 collapsed cells and kept pulling the charge outta the cranking battery

enter the isloator and new battery and ALL IS GOOD ( for now :P )
just a little left of insanity :)
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