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Old 02-20-2017, 06:23 PM   #1
Missouri Blue
 
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Default Simple Questions: shouldn't even be considered a conversion

I'm adding an auxiliary battery to my sprinter so I can add a few house lights and outlets in the rear of the van to use when we camp out of the back of the sprinter.

I've attached a photo of a diagram that I think will work, but I am open to suggestions.

I've numbered my questions 1-8 in the photo, which will hopefully make answering easy.

Thank you for taking the time to look at the diagram and answer.

John
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File Type: jpg wiring_diagram.jpg (307.3 KB, 309 views)
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Old 02-20-2017, 06:47 PM   #2
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Default Re: Simple Questions: shouldn't even be considered a conversion

Gauge questions I have no idea (We use square mm size wire) But it will depend on the load (amperes) connected to that circuit
(5) Ground it to body nearby battery (use an existing bolt or drill & tap your own thread)
(6) Run twin wire to accesories : Neg or Ground from _ terminal of battery or link connected to it.Black wire
Positive,red wire from fuse
I guess you could ground it to body nearby if you really want to
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Old 02-21-2017, 03:41 AM   #3
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Default Re: Simple Questions: shouldn't even be considered a conversion

The gauge going from the auxillary battery to the distribution panel I would run 4 gauge. from the distribution panel to the circuits I typically run 12 gauge. This may seem a little heavy especially for the LED lights but for the outlets it is not uncommon for you to get up over 15 amp draw on those especially if you are running all of them off of one circuit.

I would run the negative wire back to the auxillary battery This will keep the circuits isolated from the starting battery.

I can't see what the questions are on what I'm assuming is the cutoff switch or the auxillary battery isolator.

D
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Old 02-22-2017, 01:57 AM   #4
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Default Re: Simple Questions: shouldn't even be considered a conversion

Thanks for the replies:

Questions 1-6 are answered.

Regarding question #1 (4 gauge wire to the fuse box from aux battery): How do I wire into each fuse using 4 gauge wire? It is a cheap fuse box that doesn't have one power plug for all circuits.

Questions 7 and 8 are in regards to the isolator relay: What specific wires do I attach to the two small nuts?

Does this set up look safe? Do I need relays or anything else?
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Old 02-22-2017, 02:04 AM   #5
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Default Re: Simple Questions: shouldn't even be considered a conversion

The wires to the two small nuts on the isolator relay are ground and (best) "D+" ... a signal which tells the relay that the alternator is up and running.

Your Sprinter will have a three bolt terminal strip under the driver's seat (mounted to the emergency-brake-handle side of the pedestal)
The three bolts are (gimme a minute to find the diagram...)
... tell ya what... go read this thread, post (7) (and onward) covers the 2002.

--dick
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Old 02-22-2017, 02:27 AM   #6
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Default Re: Simple Questions: shouldn't even be considered a conversion

The +Wire running from the battery to the 6-fuse block requires a fuse.



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Old 02-23-2017, 01:45 AM   #7
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Default Re: Simple Questions: shouldn't even be considered a conversion

If I am using 4 gauge wire to the fuse box what size of fuse should I use? Any thoughts on how to attach the 4 gauge wire to the six male terminals on the "input" side of the fuse box?
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Old 02-23-2017, 04:37 PM   #8
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Default Re: Simple Questions: shouldn't even be considered a conversion

Quote:
Originally Posted by Missouri Blue View Post
If I am using 4 gauge wire to the fuse box what size of fuse should I use? Any thoughts on how to attach the 4 gauge wire to the six male terminals on the "input" side of the fuse box?
Get a better fuse panel. you will not be able to attach 4 AWG to that. Use a blue sea panel and you can bring in a single line to a bus bar. From there you fuse each line out based on the wire size you are using.
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Old 02-24-2017, 04:28 PM   #9
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Default Re: Simple Questions: shouldn't even be considered a conversion

You need to get yourself a wire sizing chart and use that - most of the guaging questions are almost impossible to answer without knowing the run distances. They are quite easy to use. Always fuse to protect the weakest link in any system, so if something in your system is rated for a max draw of 5 amps, then you fuse with 5 amps. If you fuse any higher, you risk over heating that given element of the circuit. If you are ever in doubt go larger for components and smaller for fusing (i.e., larger wire, smaller fuse). There is nothing wrong with over sizing the wire, just costs a few more pennies. There is real danger in under-sizing the wire (like burning down your rig)

For grounding, use a common bus bar and ground to the chassis at the battery. Using a two wire configuration for the lighting and sockets is ideal for trouble shooting down the road (i.e., run pos and neg) - you can ground at each fixture on the chassi, but this could be pure hell down the road if anything ever goes strange on you.
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Old 02-24-2017, 05:34 PM   #10
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Default Re: Simple Questions: shouldn't even be considered a conversion

Use this tool for determining you wire sizes:

http://circuitwizard.bluesea.com/





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