Good Sam Club Open Roads Forum: Jump box for dual battery 7.3 diesel
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 > Jump box for dual battery 7.3 diesel

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zb39

slippery rock

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Posted: 03/01/21 12:37pm Link  |  Quote  |  Print  |  Notify Moderator

I have jumped my own vehicle with house batteries and a good pair of jumper cables. No issues.


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time2roll

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Posted: 03/01/21 02:38pm Link  |  Quote  |  Print  |  Notify Moderator

zb39 wrote:

I have jumped my own vehicle with house batteries and a good pair of jumper cables. No issues.
I believe most motorhomes have button to push to boost the start battery with the house. Common, ordinary and normal.


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Rscconrad

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Posted: 03/01/21 04:47pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 7.3. My solution was not a jump box but a cheap light 1000 watt generator and small battery charger.

Both come in handy at times

Bedlam

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Posted: 03/03/21 02:08pm Link  |  Quote  |  Print  |  Notify Moderator

With my on-board generator, I use a battery charger/booster to jump a vehicle. If the camper batteries are too weak to start the generator, I use jumper cables from the truck to camper. I have not had a case where both banks were dead at the same time because I have isolation between them.


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Kayteg1

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Posted: 03/04/21 08:38am Link  |  Quote  |  Print  |  Notify Moderator

Rscconrad wrote:

I have a 7.3. My solution was not a jump box but a cheap light 1000 watt generator and small battery charger.

Both come in handy at times


The 1000W inverter generator was 3rd addition to my generators family.
When a member posted $150 sale at HD, I simply could not refuse the buy.
At 20lb weight, I take it as backup on all camping or boating trips.
Used it couple of times at home when wind knocked power lines.





mkirsch

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Posted: 03/04/21 12:45pm Link  |  Quote  |  Print  |  Notify Moderator

RoyF wrote:

Should camper batteries be used for engine starting? I have understood that deep-cycle batteries are not designed to deliver that kind of high amperage. Would engine starting harm camper batteries, or not?


When the alternative is standing there with your thumb firmly inserted somewhere in your body, stranded, does it really matter?


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mkirsch

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Posted: 03/04/21 12:52pm Link  |  Quote  |  Print  |  Notify Moderator

It's a RARE occurrence that the starting batteries on the truck are truly flat dead. No booster pack is designed for that. No jumper cables are designed for that.

These ads where they show the booster pack miraculously starting the "dead" car, the car's battery is just marginal. It still has some capacity left, just not quite enough to turn the vehicle over. When you try these on flat dead batteries, they always fail.

Kayteg1

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Posted: 03/04/21 01:05pm Link  |  Quote  |  Print  |  Notify Moderator

mkirsch wrote:

It's a RARE occurrence that the starting batteries on the truck are truly flat dead. No booster pack is designed for that. No jumper cables are designed for that..

My #2 jump cables do that just fine, but did not try it on big diesel.
Than as I mention- 2 of mid-size booster packs started big diesel with completely flat batteries.
But you should avoid such procedure on modern vehicles as low voltage operation can not only fry some expensive modules, but flat batteries can burn alternator at the end.

Grit dog

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Posted: 03/04/21 01:49pm Link  |  Quote  |  Print  |  Notify Moderator

mkirsch wrote:

It's a RARE occurrence that the starting batteries on the truck are truly flat dead. No booster pack is designed for that. No jumper cables are designed for that.

These ads where they show the booster pack miraculously starting the "dead" car, the car's battery is just marginal. It still has some capacity left, just not quite enough to turn the vehicle over. When you try these on flat dead batteries, they always fail.


Guess it depends on your definition of rare. Regardless, not sure what you mean they won't start a dead flat battery.
I tested out the little Lithium one I bought for my bike. It was only a small cheap $50 800-1000A one, unhooked the battery cable on my 5.3 Chevy, cold engine, hadn't been run that day and it lit jump started it.


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jimh425

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Posted: 03/04/21 04:38pm Link  |  Quote  |  Print  |  Notify Moderator

I didn’t check the voltage of them, but I have started v8s that had batteries that wouldn’t even cause a click. My older large model wouldn’t but the little lithium ion newer ones would.

I like the idea of carrying two if you are worried about how much power you have. They do suck the power down of the jump box with each start.

I also carry long battery cables that can reach my house battery bank, but only carry a single higher rated lithium type jump box for the truck. The combination will likely start my truck. The cables are probably twice as big as one jump box. [emoticon]

I also carry a 12 gauge cable to jump start my generator that reaches the front truck battery. I started carrying that 15 years ago and have used it a few times. Cheap and easy to make. Very small, and I made it because my TC was at a storage lot with dead batteries. Of course, you can’t run electric jacks without power unless you want to manually move them with a drill or crank.


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