Caution everyone, this is a long post.
Sorry I was away. Jamman is right. You only need to hook up the 12 pwr. The D+ and S+ are signal wires. I have the 12v pwr hooked up, no d+ or S+. My fridge will NOT find and switch to 12V automatically. It will auto switch in priority to 110 then propane. I have to manually choose/force 12v and thats the way I like it, uh huh, uh huh. (wasn't that a catchy song at one time).
Front page text selection thru adobe of my manual is below. I thought it was the same as rbryan4 link but now I think about it I looked at the manual in that link a few weeks ago and decided I did not like it as it was from another country and geared to 220 v (and who knows what else is different). The manual I have I beleive I got off a dometic website. Should have kept the link but didn't. I will pm you the whole manual if you like. its about 1.5 MB.
RMD 8501 RMD 8505
RMD 8551 RMD 8555
Looks like it was copyright 2009.
Here's section 4.9.3 without the pictures. (i've noted where there are pics)
4.9.3 Terminal strip
pic of back of fridge showing terminal strips)
A = Ground heating element DC
B = Positive connection,heating element DC
C = Ground electronics
D = Positive connection, electronics
D+ = Alternator signal
S+ = AES input signal from solar
Fig. 36 (pic close up of term strip A and B.
Pic close up of term C and D and D+S+
For MES and AES it is compulsory to provide
a permanent 12V DC supply at the terminals
C/D (permanent voltage supply for functional
4.9.4 D+ and solar connection (only for
D+ − connection:
n >Automatic Mode< the AES electronic system
automatically selects the most efficient energy
supply. In automatic mode the electronic
system uses the D+ signal (dynamo +) of the
alternator to detect 12V DC. 12V DC operation
is selected only while the engine is running in
order to prevent battery discharge.
on the vechicle
on the appliance
S+ − connection:
12V DC energy can be optionally achieved by
mounting solar equipment to the vehicle. The
solar power equipment must be provided with a
solar charging controller with AES output (ade-
quate charging controllers available in selected
stores). The "S+ connection (Solar +) must be
connected to the respective terminal of the solar
charging controller (AES output). The electronic
system uses the S+ signal of the solar charging
controller to detect solar 12V DC.
Cable cross−sectional areas:
There are no particularly high current flows via
the D+ and S+ connection; therefore no particu-
larly large cross-section is required for these
connections (approx. 1mm˛ is sufficient).
As I said I will pm you the manual.