12v dc plug not working

Submitted: Thursday, Aug 29, 2013 at 17:30
ThreadID: 104098 Views:3119 Replies:4 FollowUps:2
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The dc plug on our primus 40l fridge/freezer isn't working. Does anybody know if they have a fuse? The power is right up to the lead end but when we put it into the fridge plug it won't work.
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Reply By: Sand Man (SA) - Thursday, Aug 29, 2013 at 18:18

Thursday, Aug 29, 2013 at 18:18
I assume you mean the 12v socket on the fridge?
The end of the lead has the plug.

Looking at a manual for a primus fridge, it is recommended that a fuse be included in the circuit to the fridge. This may indicate there is no internal fuse on the fridge itself.
Take a look at the area adjacent to the 12v socket. Can you see a bladed fuse of some kind?

Does it run OK on 240v?

What voltage measurement are you getting at the end of the 12v lead plug?
The fridge appears to have 3 different settings for low voltage cutout.
The voltage you are getting should be 12.8 volts or above, which indicates a full battery capacity. Any voltage drop in the circuit may reduce the voltage below the minimum necessary to overcome the low voltage cutout device.

The low voltage cutout device itself may also be faulty.

The chances are you need an expert to look at and test the fridge operation both on 240vac and 12vdc and diagnose the problem.

Bill


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AnswerID: 517266

Follow Up By: Member - Bob M6 - Thursday, Aug 29, 2013 at 19:30

Thursday, Aug 29, 2013 at 19:30
Hi Sandman,

It works ok on 240v. Can't see a fuse. Over 12.8v at end of the plug. Can't see the dropout settings must only work when the plugged in but I'm sure it was 10.7 or thereabouts.

I think we need the expert. Thanks for your reply, if I find out what's wrong I'll post it.

Thanks again
Bob
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Reply By: Member - mechpete - Thursday, Aug 29, 2013 at 20:08

Thursday, Aug 29, 2013 at 20:08
check all your connections back to the battery , you can have 12v at the plug end with no load ,
but a poor connection between the battery an fridge somewhere it drop off under load
an ya fridge won,t go .
been there an done that
mechpete
AnswerID: 517272

Reply By: Member - Rosco from way back - Thursday, Aug 29, 2013 at 21:29

Thursday, Aug 29, 2013 at 21:29
Is this a 3 way rather than compressor fridge? If so the 12V heating element may be cactus.
AnswerID: 517279

Follow Up By: Member - Bob M6 - Thursday, Aug 29, 2013 at 21:39

Thursday, Aug 29, 2013 at 21:39
Its a 12/240v fridge/freezer. Compressor type
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FollowupID: 796924

Reply By: Grizzle - Friday, Aug 30, 2013 at 07:27

Friday, Aug 30, 2013 at 07:27
See if it works with the engine running, a lot of the the time the extra voltage will overcome poor wiring. If it works like that then you may need to check the car wiring. If not you may have a fridge problem.

Wiring for fridges is always a pain if its not quite right!!!

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AnswerID: 517297

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