jumping a battery dead?
Smokin
Joined: Jun 2006
Posts: 8,849
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Keep in mind that jumpstarting a diesel can be extremely difficult, sometimes impossible. The one time I had mine jumped, we had to jump it with an F250 with dual batteries, and two sets of jumper cables.
Your two batteries are connected, so either one can take in the voltage needed to start the truck. You need to replace both because if one is weak, so is the other...and the weak battery you dont replace will drag your new one down the toilet.
Your two batteries are connected, so either one can take in the voltage needed to start the truck. You need to replace both because if one is weak, so is the other...and the weak battery you dont replace will drag your new one down the toilet.
Junior User
Joined: Jul 2006
Posts: 87
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From: South Central, PA
Hopefully, the batteries died because an auxilliary device (headlights, radios, etc) was left on overnight and not because of internal shorts within the battery.
Something to consider is the vast amount of current needed to "Start" these PSDs. So, when you get a "jump" from a friendly motorist, it would be best to allow the charging vehicle to "charge" the dead batteries, prior to attempting a start.
Additionally, the typical "jumper cable" wire gauge is relatively small, compared to our battery cables. It is not capable of passing the current needed to actually "start" our trucks. With dead batteries, you might get a decent "arc" when making the last connection, created by an inrush to fill the depleted/shorted batteries. As always, make the last connection (-) to an engine mounted frame/bracket rather than a battery. Don't want "sparks" around a battery!
Just my thoughts, I'm not an expert
Something to consider is the vast amount of current needed to "Start" these PSDs. So, when you get a "jump" from a friendly motorist, it would be best to allow the charging vehicle to "charge" the dead batteries, prior to attempting a start.
Additionally, the typical "jumper cable" wire gauge is relatively small, compared to our battery cables. It is not capable of passing the current needed to actually "start" our trucks. With dead batteries, you might get a decent "arc" when making the last connection, created by an inrush to fill the depleted/shorted batteries. As always, make the last connection (-) to an engine mounted frame/bracket rather than a battery. Don't want "sparks" around a battery!
Just my thoughts, I'm not an expert
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tpolley
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
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May 15, 2009 01:01 AM
