6x6 28v alternator

[xplore]

Hi, have a 6x6 with both 12v & 28v alternators my problem is with the 28v alternator which l use to run only the 24v plug n play roof mounted air con. the alternator just stopped producing any volts, both belts are ok, the large cable running from alternator to control box has been disconnected and reconnected ( just in case it was loose ) where to from here ? anyone got any ideas……Gaz. 

[Philthy]

Hi, have a 6x6 with both 12v & 28v alternators my problem is with the 28v alternator which l use to run only the 24v plug n play roof mounted air con. the alternator just stopped producing any volts, both belts are ok, the large cable running from alternator to control box has been disconnected and reconnected ( just in case it was loose ) where to from here ? anyone got any ideas……Gaz.

Start simple = checked the fuses?

Need more information and the specs for aircon. like its draw... Both start/run.

How long did it work for?

Does the aircon. have its own fuse? 

You have traced wire back to the CAV with test equipment?

What mods have you done from standard issue?

If you are sure its the CAV buy a new one that is 25kg less in weight. Or go to a truck wrecker... 

[Sixty]

If the batts are flat the generator will not have a 'sense' voltage and they do not self-excite  ;-)

Jump start the 24V batts and re-check output.

[xplore]

Thanks Guy's for your valuable input, l have done the following'
1 checked fuses
2 have had the air con for 4 mths without a prob's
3 air con has it's own fuse
4 have carried out quiet a few mods but the 28v system has been left alone ( apart from the air con )
So l will charge up batteries and see how we go, will keep you posted…..again thanks for your help….Gaz

[John H]

as Sixy said.

[xplore]

If the batts are flat the generator will not have a 'sense' voltage and they do not self-excite  ;-)

Jump start the 24V batts and re-check output.

Well finally had a chance to charge batteries and you are quiet right Sixty generator now charging fine ,again thanks for your and others for help and advice….Gaz

[aussiegregmac]

Well done Sixty.  I'm in awe.   You da man.

[Sixty]

If the batts are flat the generator will not have a 'sense' voltage and they do not self-excite  ;-)

Jump start the 24V batts and re-check output.

Well finally had a chance to charge batteries and you are quiet right Sixty generator now charging fine ,again thanks for your and others for help and advice….Gaz

no worries  ;-)

[tona]

    HI SIXTY , BEEN MEANING TO ASK YOU WHAT THE LETTERS F.N.Q. STAND FOR ,TONA,.

[Ravvin]

Far North Queensland.

[circlework]

If the batts have lost charge, but the sense wire is definitely connected, there is a problem with either the alternator not reaching the correct voltage to charge them, or the aircon is dropping too much voltage for them to charge.   You might check what your float voltage is ... can't remember what the float spec is but probably 2 x 13.8V = 27.6V.   Somebody else might know?