Ammeter problems - smoked and crispy - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand

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  #1  
Old 25-04-2005
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Default Ammeter problems - smoked and crispy

I completely toasted my ammeter on Saturday night

I was doing a triple line pull on the Warn 8274 off a tree with FrankenJeep (my Willys) having to also pill a fully laden CJ7 with a dead Ramsey winch (we now call these Ramsey winches 'allnighters' because we spent the night on top of this mountain and had to wait until morning the mud to dry to a goey clay rather than the porridge we were trying to drive in before)

The conditions were severe , really deep wheel ruts left by 36" equipped rigs which swallowed our 32" tyres and meant that both jeeps were dragging there chassis and diffs through the mud

The ammeter started to smoke and then sparks started flying out and FrankenJeep was blinking like a Christmas tree from the intermittent dead short

Luckily the ammeter stayed in one piece even if the glass was covered in vaporised and then dried brown melted electrcial insulation and the needle pegged off the scale to the right , it didn't go complete dead short and I nursed the winch the remainder of the trip by doing double line pulls

I had one bad electical fire once where the ammeter got shaken apart from off road vibrations and it took out the engine bay wiring harness in FrankenJeep - so the ammeter is a real potential immobiliser and possibly Jeep killer

The winch is taking power straight off the battery

The alternator is a 120amp 14V Bosch unit out of a Mercedes 300e and I am running 2 x 80amp hr batteries

The ammeter has a max rating of 60 amps which is the largest I could find locally here

Tonight I am bypassing the ammeter and I am trying to find a 300 or 400 amp ammeter off one of the old aircraft ground power units in the airport scrap yard

Does anyone else have these problems ?
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  #2  
Old 25-04-2005
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Oh yeah - I forgot to mention - it was a 15 to 20 deg hill about 250m long - we started at 9:30pm and we climbed the hill around 7am after calling it quits and breaking out tents at 2:30am starting again at 6am

I was so tired I slept in the passenger seat with my legs extending out on the bonnet - too tired to pitch a tent !
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  #3  
Old 25-04-2005
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nice one tone.
get bigger tyres.
  #4  
Old 25-04-2005
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JJ, is an ammeter the same as a voltage regulator ?

I refer to the internal voltage regulators the TJ alternators have.

Beefier units (eg 220amp) have dual externals (eg US-made Penntexx, avail in Aus too) with plenty of fins for cooling.

I may be on drugs if so, lemme know what a ammeter is
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  #5  
Old 25-04-2005
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No he meant Amateur! They were making amateur jeep porn...
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  #6  
Old 26-04-2005
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ammeter as in the gauge on the dash ???


Dont feed it direct current, create a small meter circuit that only has a % of the real current following through it and calibrate with the appropiate resistors


This is how a ammeter in a multi meter works. It can not handle more then a few milliamps but with the meter you can measure amps !!!
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Old 26-04-2005
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Default Amps

As you found out putting 120 amps through a 60 amp don't work to well.
Similar problem in a ute I had - fixed by putting in a ammeter that could take/show higher readings and some heavier wiring - got one from a marine supplies outlet cause hard to find in automotive places - no problems since - also not being much of a sparky had it wired up by auto electrician. - could also try a truck place maybe
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