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Old 03-22-2015, 10:16 AM   #29
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It would be easier to get a jump box.. I have a couple of them.. Keep one in the coach one on the boat.. They are handy to have around ( as long as you keep it charged)
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Old 03-22-2015, 10:28 AM   #30
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It would be easier to get a jump box.. I have a couple of them.. Keep one in the coach one on the boat.. They are handy to have around ( as long as you keep it charged)
I have one that I bring on trips where I'm not bringing my toad. If I am bringing the toad, I've already got a second vehicle for a jump-start.

But there's still an advantage to doing it the old-fashioned way with jumper cables from another vehicle. Namely, no matter how long it takes, the car providing the jump-start is using its alternator to provide the power, and you don't have to worry about it running down from repeated failed attempts to start the other vehicle.

Using a jump box, if the engine fails to start after a few attempts, the jump box might end up dead too. I never have actually put it to the test to see how many starting attempts you can get from a jump box before you have to recharge it.
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Old 03-22-2015, 10:47 AM   #31
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if the starter battery is dead enough, it must be disconnected before a jump start will work. Part dead, allowing the slave vehicle to run may charge the dead one enough to complete the jump. Running the alternator without a battery load can fry the diodes in the alternator. Be careful.
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Old 03-22-2015, 11:27 AM   #32
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if the starter battery is dead enough, it must be disconnected before a jump start will work.
I thought that was only for a battery that had an internal short, not one that was just deeply discharged. Oh, well, learn something new every day. Funny, I just said the same thing yesterday on a different thread. I guess I really am learning something new every day!

In that case, disconnect the negative terminal only, jump-start (grounding the jump box or cables to the vehicle chassis), and reconnect the negative terminal once the engine starts. Safest way I can think of to take the battery out of the circuit for jump-starting without leaving it out of the circuit to damage the alternator.
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Old 03-22-2015, 12:27 PM   #33
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Coach Net is coming to the rescue on Tuesday. Will leave the jump starting to them.

More questions though:

1. If rig is plugged in while in storage, will that charge the house batteries AND the chassis battery?

2. If our house batteries are this low, is it likely that we'll have to replace those? We have two 6v golf cart batteries.
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Old 03-22-2015, 03:10 PM   #34
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Coach Net is coming to the rescue on Tuesday. Will leave the jump starting to them.

More questions though:

1. If rig is plugged in while in storage, will that charge the house batteries AND the chassis battery?

2. If our house batteries are this low, is it likely that we'll have to replace those? We have two 6v golf cart batteries.
If your Magnum was not charging due to a bad communication cable from the inverter to the ME-RC remote, there will be no charging to your engine battery thru the BIM, as there is now no charging source present.

Depending on how low the battery voltage is and how long they have been in an uncharged state, they may still be good IF they haven't sulphated. They should be charged fully and then tested with a conductance meter, which will give you a definitive answer on their condition.
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Old 03-22-2015, 05:59 PM   #35
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Thanks Lew. I wonder if the communication cable is the one that has the hole in it. Did Mark text you that photo last night?
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Old 03-22-2015, 08:02 PM   #36
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Thanks Lew. I wonder if the communication cable is the one that has the hole in it. Did Mark text you that photo last night?
Follow the cable to where it plugs into the inverter. There should be a blue label on it marked 'REMOTE'. It looks like there is sufficient slack in the cable to cut it beyond the breach and put a new RJ-45 end on it. It's basic 4-conductor phone cable. Be sure to align the colors exactly as they are on the plug that you cut off.
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Old 03-22-2015, 09:57 PM   #37
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My experience on jump starting is that the running vehicle is merely charging the dead vehicle's battery, not providing starter current which is several hundred amps and would require cable size the same as the battery cables and a lot better connectors than the clip-on ones on jumper cables.
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Old 03-22-2015, 10:09 PM   #38
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My experience on jump starting is that the running vehicle is merely charging the dead vehicle's battery, not providing starter current which is several hundred amps and would require cable size the same as the battery cables and a lot better connectors than the clip-on ones on jumper cables.
You use jumper cables smaller than battery cables? I've never heard of such a thing! And you should see the alligator clips on professional-quality cables. You could damn near amputate a finger if you accidentally let one snap closed on your hand. Them suckers can grip!
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Old 03-23-2015, 12:26 AM   #39
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But the actual contact points are relatively small and won't pass high current. If you have clips that will mate w/ a lot of surface area, then you might be able to start a car w/o a battery w/ cables.

Actually the first jumper cables I bought (and still have) are about the size of welding cables. I thought then that they had to pass hundreds of amps. Then one time I helped someone jump their car and all they had was these puny little cables. I thought that this would never work but hooked them up and let the donor car charge a couple of minutes and voila, the other car started like it had a new battery.

Same way these cables that interconnect the lighter sockets work. While I've had no first hand experience w/ them, I have heard some anecdotal evidence that they work also.
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Old 03-23-2015, 01:30 AM   #40
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But the actual contact points are relatively small and won't pass high current. If you have clips that will mate w/ a lot of surface area, then you might be able to start a car w/o a battery w/ cables.
I've done it before— after removing a starting battery that ruptured in a neighbor's car (what a mess!)— so mine must have enough contact surface. For the record, the battery in question ruptured before I got home from work, so I don't know what caused it to rupture.
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Old 03-23-2015, 12:13 PM   #41
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I've done it before— after removing a starting battery that ruptured in a neighbor's car (what a mess!)— so mine must have enough contact surface. For the record, the battery in question ruptured before I got home from work, so I don't know what caused it to rupture.
Maybe they hooked up the jumper cables reversed polarity.
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Old 03-23-2015, 12:56 PM   #42
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Maybe they hooked up the jumper cables reversed polarity.
Only if it was someone else's cables before I got there. But that sure could have done it…
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