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Ford 9N, 2N & 8N Discussion Forum
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Checking for short

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reddogge

11-22-2007 08:04:47




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How do I check for a short in my 6V 9N system? I may have a small current draw which is dragging my battery down. Keep in mind I'm electrically challenged.




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Sam#3

11-22-2007 10:26:40




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 Re: Checking for short in reply to reddogge, 11-22-2007 08:04:47  
If you don't see the 'short' with the discribed methods try testing with the 'm' section of vo'm'. I have an old Murrey mower with .006 Microamp high resistance leak. I couldn't see spark or get a reading with anything but the MicroAmp scale. I suspect the dirty grease on the wire but I still haven't cleared the problem. I just disconnect the battery. Something for the harness mending time this winter.

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soundguy

11-22-2007 17:50:25




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 Re: Checking for short in reply to Sam#3, 11-22-2007 10:26:40  
.006 micro amp leak.. and you are worried about it? I bet the battery self discharge rate is more than that...


Soundguy



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Sam#3

11-22-2007 23:00:45




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 Re: Checking for short in reply to soundguy, 11-22-2007 17:50:25  
Nope! Will run down in two days. Disconnect the battery and it will sit for up to ten days. Thats as long as left it sit at one time.
And, I'll agree it dosn't sound right. The modern cars pull a lot more than that and will sit for weeks.



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soundguy

11-23-2007 07:55:58




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 Re: Checking for short in reply to Sam#3, 11-22-2007 23:00:45  
It is is running down in 2 days.. it is a WHOLE LOT more than .006 micro amps!!

Your draw that is flattening the battery in 2 days is in the 'AMP' range.. not micro amp.. or milli amp range for SURE.

You should be able to track this down with a low wattage lamp inline with the hot cable to the battery.. then just start pulling wires till the lamp goes off.

Soundguy



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JMOR

11-22-2007 17:56:14




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 Re: Checking for short in reply to soundguy, 11-22-2007 17:50:25  
For sure! You won't lose $ on that bet!



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soundguy

11-22-2007 08:58:26




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 Re: Checking for short in reply to reddogge, 11-22-2007 08:04:47  
good advice by all.

I've found low wattage test lamps work good for the current dray indicator.. 'grain of wheat' bulbs work great to.

soundguy



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Dell (WA)

11-22-2007 08:52:27




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 Re: Checking for short in reply to reddogge, 11-22-2007 08:04:47  
doggie..... ...you say you "have a small current draw which is dragging my battery down"?..... .don't fergitt invisible chemical salts ontop of yer battery. Rinse well with A&H "baking soda" to neutralize the leaking salts. (it will foam)

Otherwize; INSPECT ALL yer wiring for "nastys". (frayed wires, corroded terminals, loose screws)

My guess? yer 2-terminal roundcan cut-out relay is NOT POLARIZED. Repolarize it with pair of pliers handles, "arc-sparkin" across the 2-terminals. Engine OFF. Simple, eh? You can re-polarize as many times as you want, it won't hurt 'nuttin'..... ...Dell

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old

11-22-2007 08:39:36




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 Re: Checking for short in reply to reddogge, 11-22-2007 08:04:47  
Well if you have a meter its real easy to do. You just take one wire off at a time, and check for voltage, if you have voltage then you found your problem. Of course thats with the switch off. Remove the wire hook one lead to the wire and the other to where it came off. Common area is the VR and haveing one of the relays sticking

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JMOR

11-22-2007 08:37:12




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 Re: Checking for short in reply to reddogge, 11-22-2007 08:04:47  
Disconnect the battery cable & insert a small 6v bulb in the circuit between the battery terminal & the cable. If it lights you have a drain. Start disconnecting potential 'drains' until you find the disconnected wire that caused the light to go out. Individual wires, one at a time at the generator, cut-out, ignition switch, lighting/switch, and anything else that is powered. See diagram.

In the event the 'drain' is too small to light the bulb, remove the bulb and put a voltmeter in its place. If there is absolutely zero drain, it will show zero volts. If you get a reading, the follow the one by one disconnect as above.

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