GMC Motorhome Digest V2 #623

[ron keener]

Duane - reason i was shy on using cabin power for compressor was due to
Murphey getting me recently - I had both cabin and engine batteries low
at same time - I did not have enough battery to start either engine or
onan - but I did have a portable jumper battery (great buy!) that i used
to get onan started then charged both sets of batteries from it - it
seems to me that I am more likely to run the cabin batteries low than
the engine battery - if I can level and get back on the road with the
engine battery then I can recharge the cabin batteries while in motion

I put in a new ground wire from compressor to cabin fuse panel - works
great using the original hot wire (which I assume comes from the engine
battery)

thanks

- --

ron keener near Austin, Texas http://MidAmericaBreedingTech.com
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[edgar t. kremer]

You'll find a schematic at my site
http://meltingpot.fortunecity.com/greenside/321/ to change the voltage
source from the engine battery to the house battery.

> -- [ From: Eugene Fisher * EMC.Ver #3.1a PRODIGY ] --
>
> You can be almost certain that if it is stock the power came from the
> engine battery. One way to test it is to measure the voltage at the pump
> with the pump running. You will see almost a full volt drop in voltage
> from the voltage of the battery. If you have this voltage drop , the
> source is the engine battery. There is a write up on my web page (air
> system upgrade)that describes the modification, but I am sorry there is
> no schematic.
>
> gene
>
> -------- REPLY, Original message follows --------
>
> Date: Tuesday, 24-Aug-99 09:28 PM
>
> From: Ron Keener \ Internet: (rkeener)
> To: Eugene Fisher \ PRODIGY: (JDDP32B)
>
> Attachment: mimemsg.doc Code: 05KCHMI \ Created: Unknown [3 Kb]
>
> Subject: Re: GMC: GMC Motorhome Digest V2 #623
>
> gene - I see both points of view as being valid - but I still dont know
> if the stock compressor hot lead is from engine or cabin battery - do
> you have a wiring schematic that will tell us?
>
> thanks
> --

 

[ron keener]

Edgar - thanks for the URL for your electical schematics - I like the
idea of the monitor light for the compressor moter using the existing
wiring - that swings my decision to use cabin power for compressor - i
will make that change soon

for now i have the ground lead problem solved

- --

ron keener near Austin, Texas http://MidAmericaBreedingTech.com
**************************************************************
* proud owner of classic 1978 GMC Birchaven motorhome
**************************************************************