Lost 12 volt for fridge (1 Viewer)

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Jul 6, 2009
1,929
2,448
Funster No
7,383
Hi all dometic fridge freezer, stil have auto select for gas or 240, but when I start engine it does not switch to 12 volt/ always has done before. The 12 volt control circuit seems ok but I presume have lost the d+ circuit
 
OP
OP
B
Jul 6, 2009
1,929
2,448
Funster No
7,383
The system has an Electroblock 630 I am looking for a 2 amp fuse that appears to control the D+ but cannot see it?
 
Apr 27, 2016
7,144
8,418
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
This EBL 630 has a totally different structure to other EBLs. The EBL has a bus output (SDTbus) that goes out to different bus modules located around the MH. The fridge has its own module (KM630) (Kuhlschrank Modul).

There isn't a 2-amp fuseon the D+ like the other EBLs. There is a 'polyfuse' self-resetting fuse inside the EBL.

First thing to check with D+, is it present at the front of the EBL on the 2-pin connector BL14? It should be present on both pins. There are two alternatives for the D+ signal, the easiest one to check is if it is 'active high', about +12V when the engine is running, and about zero when the engine is stopped. If not, is might be an 'active low' signal.
 
OP
OP
B
Jul 6, 2009
1,929
2,448
Funster No
7,383
This EBL 630 has a totally different structure to other EBLs. The EBL has a bus output (SDTbus) that goes out to different bus modules located around the MH. The fridge has its own module (KM630) (Kuhlschrank Modul).

There isn't a 2-amp fuseon the D+ like the other EBLs. There is a 'polyfuse' self-resetting fuse inside the EBL.

First thing to check with D+, is it present at the front of the EBL on the 2-pin connector BL14? It should be present on both pins. There are two alternatives for the D+ signal, the easiest one to check is if it is 'active high', about +12V when the engine is running, and about zero when the engine is stopped. If not, is might be an 'active low' signal.
Many thanks for your reply, will have a check in the morning
 
OP
OP
B
Jul 6, 2009
1,929
2,448
Funster No
7,383
This EBL 630 has a totally different structure to other EBLs. The EBL has a bus output (SDTbus) that goes out to different bus modules located around the MH. The fridge has its own module (KM630) (Kuhlschrank Modul).

There isn't a 2-amp fuseon the D+ like the other EBLs. There is a 'polyfuse' self-resetting fuse inside the EBL.

First thing to check with D+, is it present at the front of the EBL on the 2-pin connector BL14? It should be present on both pins. There are two alternatives for the D+ signal, the easiest one to check is if it is 'active high', about +12V when the engine is running, and about zero when the engine is stopped. If not, is might be an 'active low' signal.
Thank you again for your input. I disconnected the 12 volt hab supply from the batteries waited a few mins reconnected and the auto switching now works fine turn ehu off fridge switches to gas, start the engine goes to 12 volt. But from a couple of days ago the fridge now refuses to light on gas. Plenty of gas heater working fine and hard as its cold, full flame on the burners and a recent new regulator. Even with all gas appliances off fridge will not light on gas. Good spark but no gas. No apparent power to gas valve. Problem as away in France for 90 days?

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