This started with AC compressor not coming on, checked all connections and there is no power going to compressor, compacitor is good but the start boost is not good (got one ordered). While trying to diagnose this problem I noticed the lights were dim. The fresh battery that was put in the camper now only has 6 volts. I checked all fuses at electric box and they are good, I am hooked to shore power (pole barn wired for camper). With the battery out the campers lights are dim and the slides will barely move. If this is my converter could it also be causing the AC compressor to not come on? I hooked a fresh battery to the camper but the AC compressor still will not start. Condenser fan and blower will work though. Thanks

Check the wiring from the converter to the battery. My bet is you have either a loose positive wire or a loose negative wire. In my case, same thing, my negative wire took about 3 turns on the converter negative terminal strip.

It could be low or no voltage from shore power.Verify shore power with known good appliance. (Drill motor)

Sounds like to me you have lost your 120VAC connection at the pole barn... This means the converter/charger is not ON and the battery has run down on you. When a battery goes below 12.0VDC it means you are approximately at 50% charges state. ZERO charge state on a battery is around 10.5VDC... I would look first for why the converter/charger is not ON. The converter/charger should put out at least 13.6VDC when it is powered ON.AT the pole barn connection you should look for 120AC VOLTAGE readings at the 30A Pedestal receptacle...30ANOSHOCKZONE ImageUsing a 120VAC Circuit tester at the pole barn connection using a RV30A-15A adapter you should see the bottom two ORANGE LIGHTs for 'CORRECT' being ON telling you all three connections for HOT-NEUTRAL-GROUND are correctly wired.Google ImageI think you have lost your SHORE POWER 120VAC connection feeding the 120VAC Power Distribution Panel...Google ImageIf you have good 120VAC feeding the Trailer and your converter/charger is ON then you need to read the DC OUTPUT VOLTAGE at the converter/charger DC OUTPUT connection for 13.6VDC. If all of the connection between the converter/cbarger DC OUTPUT connection are correct then you also see this 13.6VDC on the battery terminals. If you only read the 8VDC at the converter/charger terminals and the battery terminals then the converter/charge is OFF or FAILED. Both the Converter/charger and the battery DC output connections feed the same point on the 12VDC Distribution point. IN this case you are actually reading the 8VDC coming from the drained down battery. Your ceiling lights being dim tells you this as well... If the converter/charger was ON and working then you would see bright ceiling lights and read the 13.6VDC on the battery terminals. Clear as mud - right????Let everyone know what you read and they will start responding what is wrong...My bets is the converter/charger is not putting out its normal 13.6VDC and since the battery readings is only 8VDC and your interior lights are dim this means your now run down battery is feeding the 12VDC Distribution Panel OK. This means to me the Converter/Charger unit is OFF for whatever reason... Either has NO 120VAC input voltage or a FAILED unit...If you have just hooked up your batteries before turning on shore etc you may have also wired the battery terminal in REVERSE and blown the two REVERSE POLARITY fuses. You would have seen sparks at the battery terminal for a second when you hooked it up backwards...Roy Ken

Roy Ken do you think the OP can understand what you have posted?? Use the KISS program.JMO

You do need good 12v power to operate the A/C controls and thermostat. New battery should have handled that.Check your fuses. Especially the main fuses next to the stack. I speculate the battery may have gone in with reverse polarity.

Only getting 8 volts from converter at battery connection

jerryspoolman
Explorer
Jul 08, 2017
KISS!
Fix the Low voltage first. Then work on the AC problem if it still exists
Greyhound_RB
Explorer
Jul 04, 2017
Glad your converter problem is solved. Got one question for your ac. You report 8.5 volts to cool wire at t-stat. What's your voltage at fan wire at t-stat?
The 8.5v seems low and I would think fan would have to have more than 8.5v to energize the fan relay inside ac unit.
all4coop
Explorer
Jul 04, 2017
Update on Convertor and AC
Replaced convertor and have 12 volts at lights and 14+ to battery. Replaced start compacitor hoping because it was bad the compressor would start. No such luck, fan comes on but no compressor. Could the thermostat if it were bad cause the compressor not coming on? I have 8.5 volts at the thermostat cool connection... Is this normal? Thanks
STBRetired
Explorer
Jun 06, 2017
With 120V in and not getting 13V+ out of the converter, I would say that the converter is bad.
all4coop
Explorer
Jun 06, 2017
yes I have, I have 120V there. Thanks for the info on posting pic
time2roll
Nomad
Jun 06, 2017
all4coop wrote:
can't figure out how to attach pic.:(
try deleting the period "." after the "Height=118" in the syntax.

Have you removed the cover plates to get at the 120v wire?
MrWizard
Moderator
Jun 06, 2017
all4coop wrote:

HERE is the pic of my convertor showing the main fuses at the top and the battery pos/neg which is where I checked voltage.
all4coop
Explorer
Jun 06, 2017
I'll give that a try and check the voltage on another plug.
MEXICOWANDERER
Explorer
Jun 05, 2017
"Good Power" means checking receptacle voltage while under load. Plug in a 1500 watt heater. What to you have?
all4coop
Explorer
Jun 05, 2017
can't figure out how to attach pic.:(