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Old 04-18-2017, 02:51 PM   #11
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You could do that but as I said, the MB guys will probably will flip. Better solution is to move those two loads over the the house batteries and wire them directly to the battery or through the battery disconnect switch. 2 amps is way too much for the starting battery but it is still significant for the house as well. Of course don't walk out the door with the main disconnect turned off or "mind the first step" and nobody is going to expect to use the slides with the disconnect turned off.
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Old 04-18-2017, 03:13 PM   #12
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You could do that but as I said, the MB guys will probably will flip. Better solution is to move those two loads over the the house batteries and wire them directly to the battery or through the battery disconnect switch. 2 amps is way too much for the starting battery but it is still significant for the house as well. Of course don't walk out the door with the main disconnect turned off or "mind the first step" and nobody is going to expect to use the slides with the disconnect turned off.
I was wondering what could be drawing power when everything was off. I will check those two items next time I get it out of storage. It doesn't make sense that the house and engine batteries are connected as there is the bypass button I use when the engine battery is dead and use the house batteries to start it. Thanks for the advise. Would be nice to have the drawing of the electric system.
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Old 04-18-2017, 03:28 PM   #13
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Remember the MB mechanic said you "have a 2 amp draw on the engine battery coming from the coach when the main disconnect is off." What he means is that it is not coming from HIS engine or chassis. B Clemens indicated that you have the steps and the slide controller connected to the chassis battery. You already have a battery isolator and that is why you have to depress the boost switch to start when the chassis battery is dead! Your problem is undoubtedly the two loads that he indicated are drawing from the chassis. Move them and put them through the main switch and your problem is solved. On my 1997 Bounder I could shut off either the chassis or the house or both. If I didn't remember to leave the steps out, I would have to jump down or back up as the switches weren't close to the door.

From what I see in storage lots, a lot of coaches allow this since there is no way to leave a coach with the steps extended unless the controller goes through a shutoff.
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Old 04-18-2017, 03:46 PM   #14
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From what I see in storage lots, a lot of coaches allow this since there is no way to leave a coach with the steps extended unless the controller goes through a shutoff.
There is a switch installed on my GT 270 allowing me to leave the steps extended or extend/retract with the door open/close. Another cool feature is that if I left the switch there and go inside and start to drive, the steps will retract automatically compensating for any stupidity (forgetfulness) on my part.


BTW, I removed ALL Parasitic loads wired directly to the battery. They are on the coach side of the disconnect switch, not the battery. I installed a covered bus bar to connect them all (?8)
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Old 04-18-2017, 04:04 PM   #15
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You are right, never thought about it that way. Mine too. The point was, if your step controller is a parasitic load and you put it on the disconnected side of the switch, when you open the door the steps won't extend...unless you already left them that way before your flipped the switch. Frankly I don't know why they put these loads directly to the battery. Perhaps there is a RIVA code on some of the "safety" units.
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Old 04-18-2017, 04:24 PM   #16
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I doubt it is the step, because that is pretty common....I think we wire direct on that one due to the lock-out set up to prevent driving away with the steps out.

As for the slide...I believe that is recommended by the slide mfg. I think that was a result of 99% of slide issues being low voltage. By wiring to the chassis battery, chassis running and E-brake on, they ensure proper voltage for the slide out equipment. It's the easiest way to get the voltage they want.
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Old 04-18-2017, 04:29 PM   #17
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Sounds reasonable, if the chassis is dead you can't drive away without starting and that will power the steps!
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Old 04-18-2017, 05:28 PM   #18
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I doubt it is the step, because that is pretty common....I think we wire direct on that one due to the lock-out set up to prevent driving away with the steps out.

As for the slide...I believe that is recommended by the slide mfg. I think that was a result of 99% of slide issues being low voltage. By wiring to the chassis battery, chassis running and E-brake on, they ensure proper voltage for the slide out equipment. It's the easiest way to get the voltage they want.
. That is interesting as the slide will not work with the engine running as we found out trying to defrost the window early one morning this spring returning from FL.
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Old 04-18-2017, 07:01 PM   #19
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. That is interesting as the slide will not work with the engine running as we found out trying to defrost the window early one morning this spring returning from FL.
Question: does the chassis battery charge when the generator is running?
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Old 04-19-2017, 06:25 AM   #20
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Not like most

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I doubt it is the step, because that is pretty common....I think we wire direct on that one due to the lock-out set up to prevent driving away with the steps out.

As for the slide...I believe that is recommended by the slide mfg. I think that was a result of 99% of slide issues being low voltage. By wiring to the chassis battery, chassis running and E-brake on, they ensure proper voltage for the slide out equipment. It's the easiest way to get the voltage they want.
Too many years flying - Do it right the first time, NO Inside Diamond, follow procedures,.... Before I leave or Start engine, .... Turn on Battery Disconnect switch, remove power cord, check all DC & AC Remote Control Displays (ensures all is well with all power sources), check cabinets locked, propane locker, ... Yes a checklist, no exceptions!

So my steps won't be affected by "forgetting". Call me OCD, that is why a checklist. Military manuals include lessons learned based on mistakes made in the past. Checklists are an aid to assist in eliminating that.
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