wepeterson47 Posted May 30, 2012 Share Posted May 30, 2012 I inherited an 89 Sunrader from my relatives who are in no posiiton to provide me any info. Anyone know where the aux. battery would likely be on a 21' rear dinette model? Would it be near the inverter by chance? Same question for a battery isolater. I don't see an aux battery anywhere in the MH so I'm wondering if it was removed for some reason. Thanks in advance. wep Quote Link to comment Share on other sites More sharing options...
5Toyota Posted May 30, 2012 Share Posted May 30, 2012 i dont know the sunrader i might be wrong but i thought the rv battery went in the box on the back end the battery isolater is often under the hood that part you mentioned is called a converter changes 120 volt to 12 volts runs most everthing charges rv battery LINDA S WOULD KNOW more i think Quote Link to comment Share on other sites More sharing options...
Derek up North Posted May 30, 2012 Share Posted May 30, 2012 Sorry, no direct knowledge of Sunraders, but I think if you find a (small) ventilated compartment on the outside, probably near the inverter, you'll be getting 'warm'. Quote Link to comment Share on other sites More sharing options...
linda s Posted May 30, 2012 Share Posted May 30, 2012 On the outside drivers side there is a door for a compartment behind where your closet is. Battery should be in there. Battery isolater is in the engine compartment. Mine is older so I think different isolater but follow wires from alternater and they take you to the isolater. Linda S Quote Link to comment Share on other sites More sharing options...
wepeterson47 Posted May 31, 2012 Author Share Posted May 31, 2012 What are these? They're wired directly to the battery . Quote Link to comment Share on other sites More sharing options...
troyrobo Posted May 31, 2012 Share Posted May 31, 2012 that is your battery isolator Quote Link to comment Share on other sites More sharing options...
wepeterson47 Posted May 31, 2012 Author Share Posted May 31, 2012 On the outside drivers side there is a door for a compartment behind where your closet is. Battery should be in there. Linda S Only small door and storage for 110V cord (and door further back which is access to back of fridge) on driver's side. F.W.I.W. it's a 21' Rear Dinette model. Is it possible there is only one battery? wep Quote Link to comment Share on other sites More sharing options...
wepeterson47 Posted May 31, 2012 Author Share Posted May 31, 2012 that is your battery isolator How does it work, exactly? wep Quote Link to comment Share on other sites More sharing options...
linda s Posted May 31, 2012 Share Posted May 31, 2012 What are these? They're wired directly to the battery . Yes that round one is your isolater. It works by separating the charge from your alternater to the house battery and the truck battery. That way they both get charged but they are not directly connected so you can run down the battery in the house but still get the rv started. Did ya find the house battery though Linda Quote Link to comment Share on other sites More sharing options...
stamar Posted May 31, 2012 Share Posted May 31, 2012 the square ones are relays. they prevent the house battery from sucking all the juice out of the truck battery when its empty. Quote Link to comment Share on other sites More sharing options...
waiter Posted May 31, 2012 Share Posted May 31, 2012 The large round one is the isolator, Its a relay that connects the house battery to the truck battery. The two small square things are self resetting circuit breakers. If you have a short, these things will click like a turn signal as they reset and pop, reset and pop, etc. NOTE TO CHECK - Whoever owns this, you need to verify that you really do have an Isolator, and not a starter relay. Most mechanical Isolators are three wire, They have the two large connectors and one small connector. The small connector feeds an electrical coil inside the unit that energizes the relay, the other side of the internal coil is physically connected to the case. (It gets it power from the small terminal, and is returned through the case to ground. I've seen isolators that have isolated coils, i.e. one side of the coil is NOT connected to the case, but comes out to another terminal connection. These generally cost a little more, and there is no need to have the isolated coil in our application. This is why I say to just check on this, as it is unusual to see this type of isolator in this application. The reason this caught my attention, a can type starter relay can look exactly like this. you can tell the difference with a couple observations, a Starter relay, the two small terminals will probably be marked with a "S" and an "I". ALSO - And this is the important part, starter relays are not meant for continuous duty, The case will be very, very hot if left energized for more than a few minutes. i.e. burn your hand hot. If it doesn't burn you hand after being on for about 10 minutes, its probably OK John Mc 88 Dolphin 4 Auto Quote Link to comment Share on other sites More sharing options...
linda s Posted May 31, 2012 Share Posted May 31, 2012 The large round one is the isolator, Its a relay that connects the house battery to the truck battery. The two small square things are self resetting circuit breakers. If you have a short, these things will click like a turn signal as they reset and pop, reset and pop, etc. NOTE TO CHECK - Whoever owns this, you need to verify that you really do have an Isolator, and not a starter relay. Most mechanical Isolators are three wire, They have the two large connectors and one small connector. The small connector feeds an electrical coil inside the unit that energizes the relay, the other side of the internal coil is physically connected to the case. (It gets it power from the small terminal, and is returned through the case to ground. I've seen isolators that have isolated coils, i.e. one side of the coil is NOT connected to the case, but comes out to another terminal connection. These generally cost a little more, and there is no need to have the isolated coil in our application. This is why I say to just check on this, as it is unusual to see this type of isolator in this application. The reason this caught my attention, a can type starter relay can look exactly like this. you can tell the difference with a couple observations, a Starter relay, the two small terminals will probably be marked with a "S" and an "I". ALSO - And this is the important part, starter relays are not meant for continuous duty, The case will be very, very hot if left energized for more than a few minutes. i.e. burn your hand hot. If it doesn't burn you hand after being on for about 10 minutes, its probably OK John Mc 88 Dolphin 4 Auto My isolater in my Sunrader looks just like this one. 4 way is just what they used. Separate wire for the ground Linda S Quote Link to comment Share on other sites More sharing options...
Dalbery Posted June 1, 2012 Share Posted June 1, 2012 Your battery should be at the rear of your rader behing your storage pod. Flip the pod down and you'll see an access door, That's where your battery will be. Quote Link to comment Share on other sites More sharing options...
linda s Posted June 1, 2012 Share Posted June 1, 2012 Your battery should be at the rear of your rader behing your storage pod. Flip the pod down and you'll see an access door, That's where your battery will be. Different floor plans have the battery and converter in different places. I can see yours is the rear door rear bath plan so that is where yours is. The rear dinette battery has a separate battery compartment on the outside drivers side. His is a rear dinette. Not all Sunrader have a storage pod either. it was an option Linda S Quote Link to comment Share on other sites More sharing options...
wepeterson47 Posted June 1, 2012 Author Share Posted June 1, 2012 Your battery should be at the rear of your rader behing your storage pod. Flip the pod down and you'll see an access door, That's where your battery will be. Found it! Thanks, wep Quote Link to comment Share on other sites More sharing options...
Derek up North Posted June 1, 2012 Share Posted June 1, 2012 So where was it? Quote Link to comment Share on other sites More sharing options...
linda s Posted June 1, 2012 Share Posted June 1, 2012 So where was it? Well I just found pics of a newer sunrader and it doesn't have the battery door where mine is so I'm guessing it was indeed in the back Linda Quote Link to comment Share on other sites More sharing options...
wepeterson47 Posted June 2, 2012 Author Share Posted June 2, 2012 So where was it? In the back behind the storage pod - obviusly the 1 place I hadn't looked! wep Quote Link to comment Share on other sites More sharing options...
Derek up North Posted June 2, 2012 Share Posted June 2, 2012 I've often wondered what that 'mystery' door was on the back of a Sunrader. What else is in there? Just the battery plus storage? Room for a 2nd battery? Quote Link to comment Share on other sites More sharing options...
wepeterson47 Posted June 2, 2012 Author Share Posted June 2, 2012 I've often wondered what that 'mystery' door was on the back of a Sunrader. What else is in there? Just the battery plus storage? Room for a 2nd battery? Only room for the battery. Quote Link to comment Share on other sites More sharing options...
wepeterson47 Posted June 2, 2012 Author Share Posted June 2, 2012 Only room for the battery. Think I misunderstood your question. The battery 'box' is in the MH behind the storage pod (it folds down). Quote Link to comment Share on other sites More sharing options...
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