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Parasitic Draw ?
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Picture of Paul And Jaime
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I had to replace my starting battery because of a bad cell and thought I would check what the amp draw was with the ignition off just in case I had a parasitic draw. Turns out I have a draw of about .9 amps. I have no idea if this is normal for an old motor but I suspect it is not. I would think anything over .05 amps would be suspect. Where should I start looking?
 
Posts: 37 | Location: Ky | Member Since: 10-20-2020Reply With QuoteReport This Post
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I found my primary draw was a hard wired CO detector. My solution was to add a battery disconnect to the negative terminal.


If your not Royal don't get Coronated!
 
Posts: 962 | Location: St. Charles, MO, USA | Member Since: 10-09-2003Reply With QuoteReport This Post
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The alternator may have a bad diode... remove the wires and see if the load goes away.


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
 
Posts: 4407 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
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Great suggestion. Last night I checked the alternator by starting up the coach and looking at the waveform on my scope. I had less than .005 volts AC on my scope. Then I removed the wires from the alternator ( I never trust meters unless I have to ) and the load was still there. This after noon I guess I will start pulling fuses and see If I can isolate that way. I seen a chart online where you can measure the voltage drop across a fuse if there is a load on that circuit but the drop would be in millivolt range and I don't think my meter is that accurate.
 
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Definitely start pulling fuses, one at a time. Some of the circuits (like ignition?) may be fed by fusible links in the harness. Good luck.


9708-M0037-37MM-01
"98" Monarch 37
Spartan MM, 6 spd Allison
Cummins 8.3 300 hp
 
Posts: 4407 | Location: Kalkaska, MI | Member Since: 02-04-2011Reply With QuoteReport This Post
Supporting Member of Barthmobile.com 1/21
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Ole Nose has a off draw of 9 milliamps, I stuck in a disconnect to the dash and left the starter cable connected, no draw at all now. Not sure what that 9 MA is but the cut off works fine. If I forget to close the disconnect Nose still starts but without any dash stuff.


25 Ft Glassnose, 2792, 1982
454 Engine
Plain Jane Interior
Original Paint
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Supporting Member of Barthmobile.com 3/19
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older thread but maybe some info of use..

Battery Drain..


M/C-W

1991 early XL-style (maybe 1 of 2?) Breakaway... but prior to that actual (XL) designation...
2nd Breakaway w/Cat 3208T 250 hp motor 4 spd MT643 Allison trans Gilig Air suspension chassis/brakes
Data Tag: 9010 3694 34-BG-1B
 
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Glassnose Aficionado
Supporting Member of Barthmobile.com 2/09
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My aftermarket radio works with the key off, but not with the battery switch off, so I know it's drawing off the starter battery. Even when off, I'm sure there is a slight draw. I always turn the switch off when parked.


79 Barth Classic
 
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Supporting Member of Barthmobile.com 3/11
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If you have audio and video equipment and “smart” appliances there will always be a small drain of power. This is to keep memory components alive. If you disconnect entirely you will have to reprogram every time you energize your system. Better to install a Battery Tender to preserve the batteries. But it should still be no more than 250 - 300mw draw.


1993 32' Regency Wide Body, 4 speed Allison Trans, Front Entry door, Diamond Plate aluminum roof &
1981 Euro 22' w Chevy 350 engine and TH 400 tranny
 
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