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Hopefully Quick Wiring Question

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jrork

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« on: May 24, 2010, 07:55:31 AM »
Hey guys, got a quick question for you and I don’t know if I have a problem or I'm making a big deal over nuthin.

I charged the battery up after sitting all winter and for grins, I hooked my 12 volt test light between the positive post and the feed line to the boat (starter and alternator is on a separate line) just to make sure I didn’t have any problems that surfaced over the  winter.
I did ha e a slight momentary glow from the bulb and then it would dim out.  I figured this was likely just the memory from the radio but for grins, I hooked up my digital voltmeter so I could actually measure it.

I got approx. 12.53 volts and it stayed reasonably stable.  I started pulling fuses to determine what would be drawing and found that if I pulled each of the fuses for the bilge pump, radio and the electric fuel pressure gauge it would drop to 0 volts.

While I understand why the radio would have a draw due to the channel memory, why would the bilge pump and fuel pressure gauge have a draw.

Also, given that when I put a load (the 12v test light), the voltage is only momentary as the bulb only stays lit (dim) for about 1 second before it goes out leading me to believe that the bulb is pulling that voltage down.

Also, when I hook up the cables to the battery post, I am not getting a arc which I would expect I would get if there truly was a 12+ volt draw

Am I making a big deal about this or have I got a problem that needs to be chased out. 

Thanks everyone……….john


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« Reply #1 on: May 24, 2010, 08:00:19 AM »
you cant check with volts, you need to use the amp or mili amp setting.. remove neg batt cable and one lead of meter to neg post and the other to neg cable. if you have under 100 mili amp your good. any thing over start pulling fuses until draw goes away

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« Reply #2 on: May 24, 2010, 08:26:16 PM »
You will only read the 12.53 with an OPEN circuit.  If it were draining you would read the voltage drop across that resistance.
It's miller time    ::)

jrork

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« Reply #3 on: May 25, 2010, 05:02:48 AM »
Thanks very much guys.  Don't know what I was thinking but clearly I wasnt. 

 


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