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stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1220
  
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| Towing electrics help need |
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Good afternoon all I have a 2024 Adria Mississippi caravan, when towing the fridge doesn’t work on 12 volt battery is charging and volt meter is reading 14.7 at battery and 10.1 at fridge turn fridge off and it reads 14.7 turn fridge off and once under load it reads 10.1 volts again, we tried the dealership owners Volvo xc60 hybrid and all worked well , have done a little research and it says that euro 5/6 certain cars are not compatible due to smart alternator , so I am hoping that someone may be able to assist me with a solution, regards Steve
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 21st Oct 2024 2:07 pm |
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karsteb
Member Since: 10 Aug 2014
Location: Oslo
Posts: 14
  
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Could be a zener-diode in your fridge has popped and is short-circuited. Happend to my Engel fridge. The zener was rated a 15V and acts as a overvoltage protection circuit for the fridge. The voltage from the D4 alternator can sometimes exceed 15V and hence it broke and short-circuited. Always broke the car-fuse afterwards.
My brother who is an electrical engineer said "nah - no problem, you don´t need the zener. Good engineering, but a little over-protective" and just snipped off the zener - did not even replace it, and it has never bothered me again.
Could maybe be be something else since you do not see a persistent short-circuit (since it works with another car) - if there is a zener, it will be broken once you exceed the breakdown voltage and will be short-circuited forever. Maybe there is a smarter protection mechanism. But if it is a zener, your local TV repair guy will recognise it by looking at it without any schematics.
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| 31st Dec 2024 1:30 am |
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Sylvester19
Member Since: 17 Jul 2020
Location: Central Scotland
Posts: 135
 
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Have you checked the earth point in the rear boot passenger side access panel along with the trailer wiring loom connectors & the socket connections? As a minimum you should get battery voltage or whatever the alternator is putting out at the time. Measure the voltage at the car earth point and power wire when the fridge is connected, unfortunately I don't know the wire colour in the connectors for pin 10.
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| 31st Dec 2024 10:57 pm |
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stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1220
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Thank you for the replies, but the caravan dealership as fitted a sterling wild-side relay and I will be picking up the caravan on Friday and will find out if the problem as gone, everything worked fine on my previous caravan but as my friend as the same car and caravan, I have looked into the issue and found out that anything car with a smart alternator will not operate the new thetford fridge, I will update on Friday when I pick up caravan
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| 1st Jan 2025 11:16 am |
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Sylvester19
Member Since: 17 Jul 2020
Location: Central Scotland
Posts: 135
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What model of Thetford and battery type fitted? Hopefully the dealership can do some basic checks on the wiring when the car is connected and running, did they do a volt check using a voltmeter at the input side of the sterling unit, fridge on, fridge off & compare voltages on pin 9 & 10 input to unit? 10.4v is the cut off voltage for the Thetford I've fitted, needs 11.7v to cut in, and max running voltage 16v at the fridge, 10.1 is too low.
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| 1st Jan 2025 3:07 pm |
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stephenw46
Member Since: 22 Jun 2011
Location: West Midlands
Posts: 1220
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The dealership as checked the caravan and it is fine the problem is not just with landrovers it is apparently all towing vehicles with Stuart alternators and thes new fridge freezers the fridge is drawing more then the car gives but hopefully all will work okay when I pick it up Friday
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| 1st Jan 2025 3:40 pm |
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Sylvester19
Member Since: 17 Jul 2020
Location: Central Scotland
Posts: 135
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I'd appreciate if you'd post the input side voltage of 9 & 10 the dealer gets when the car is running and fridge switched on.
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| 1st Jan 2025 10:56 pm |
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