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Old 08-29-2019, 11:01 PM   #1
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1998 Discovery cranking battery issue

Last April my cranking batteries were dead each morning while boondocking. I replaced batteries and problem persists. I was unable to locate any problem or draw. Now back home while working on the issue I disconnected the two cranking batteries. A couple weeks past and I had to move the coach. Forgetting the cranking batteries were disconnected I started the coach. How is this possible? This leaves me thinking a relay somewhere is stuck open or maybe the combo battery switch is stuck on. It doesn't seem stuck. Maybe this is why the cranking batteries die overnight.
Any ideas??? Getting frustrated trying to locate the defective relay ...
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Old 08-29-2019, 11:42 PM   #2
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Welcome to iRV2 .

Sorry your first post is about problems .

First could you add some info about your coach ; Chassis manufacturer? Engine ?


During the time at home was the coach plugged in ?
When boon docking , was it JUST the chassis batteries that were dead ?

JMHO: If the battery banks were inter-connected; allowing the coach batteries to start the coach ; even with the chassis batteries disconnected. Then any draw that would kill the chassis batteries would kill the coach battery while boon docking.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 08-30-2019, 09:21 PM   #3
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While I agree with your initial diagnosis, I'm no expert. Your inverter/charger would indeed have a relay for charging purposes, and I suspect the dead battery issue would probably be traced to it.

When you say "combo battery switch" I presume you mean the AUX. Again, perhaps part of the problem is someone screwed up the wiring there as well.

There are several extremely knowledgeable folks on the Discovery Owners Assoc. (DOAI) eGroup who could offer in-depth insight on your issue. Some of the most knowledgeable also have 1990s Discoveries. It would be well worth your while to join that club and post your questions there.
Al & Cindy
'08 Discovery 40X Cummins 350 ISB 6.7 - '16 Lincoln MKX
Full-timing since 2014 after 35 years in Rockwall TX -
Home base now in Kerrville TX
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Old 08-30-2019, 09:31 PM   #4
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My coach has a starting boost switch.
Basically a switch that activates a solenoid that combines the starting battery and house batteries (in the event that my starting battery is weak).
If you have such a switch, your solenoid could be stuck in closed position. If that is the case, you may be able yo locate it and then tap it with something.
I remember doing that ages ago to my Ford vehicles as they had the started solenoid mounted separately from the started, on the wall of the engine compartment.
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Old 08-30-2019, 09:40 PM   #5
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As mentioned, look for a large relay with battery size cables on it.

Its there to combine the batteries for jump starting.

If the boost switch is always on, and its powered by the chassis battery, that could be your issue. Find and feel the big solenoid with shore power off. If its warm, its on.

The PO may have replaced the push button switch with a toggle switch. Look for it.

The inverter/charger has nothing to do with it, except that's what charges the house batteries.
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