Grumpy I depend on my van, it's my only means of transportation, and because I'm disabled
I have a good deal of problems if its not running, or won,t start,
I need to sit with the van idling at times for several hours,
and I need the van to start if I need to sleep in the van,
and do that with a few accessories being used with the engine off overnight at times
personally, ID be thinking of a dual battery system with two high capacity, high amp rated batteries.
dependability starts with a good alternator that has the capacity to charge batteries quickly,
under most conditions and without needing to keep the engine rpms much above idle,
with enough capacity to still run all the accessories without any stress,
and battery,(S) that are more than able to handle the amp loads required.
this may require an upgrade over the OEM electrical systems components
many vans used as campers have had similar mods made,
to their electrical and cooling systems
this can,t be a unique request I'm sure its been done dozens of times previously.
youll need a ,set up with a high amp rated switch, relay system,
where you charged both batteries when the engine running and relay switch,
that automatically isolates one back-up battery once the engines turned off,
so you always have the back-up to start the engine.
if you drain the mainly used battery and yes a manual over-ride to that auto relay,
that allows you to use the fully charged reserve battery to start the car,
if the other main battery is drained,
you'll obviously need a good alternator, and some skilled auto electric tech to install,
the wiring and custom wired batteries/relays etc.
example,
heres a 200 amp alt for the 88-91 corvettes
IT COMES WITH INSTALLATION INSTRUCTIONS
I installed on in my 1985 corvette and it made a significant improvement,
in the cooling fan speed and ignition spark strength, smoothing the idle.
Call (800)753-2242
https://www.dbelectrical.com/alternators
800-753-2242
they are knowledgeable and if you ask questions before buying youll have zero problems
http://www.db-starter-alternator.com/c- ... 0-amp.aspx
related links and threads
http://garage.grumpysperformance.com/index.php?threads/battery-or-alternator.10003/#post-43220
http://garage.grumpysperformance.com/index.php?threads/is-my-alt-dead.6964/#post-22890
http://forum.grumpysperformance.com/viewtopic.php?f=36&t=3222&p=8575&hilit=test+alternator#p8575
http://garage.grumpysperformance.com/index.php?threads/how-altenators-work.355/#post-492
http://forum.grumpysperformance.com/viewtopic.php?f=36&t=3222&p=8575&hilit=test+alternator#p8575
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