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Battery Drain

Posted: Sun Jan 01, 2017 11:48 am
by terrible ted
My system stared draining the batteries when the battery switch is left on.

I am open to suggestions.

My thought is to take out one thing at a time until I find the system that shorted?

I start with all the plugs for spot lights.

Re: Battery Drain

Posted: Sun Jan 01, 2017 12:09 pm
by slidingforhogs
I had same issue before, found it was my alternator doing the draining when engine off. Is your alt a single wire or one with the dual plug in on side of it?

Re: Battery Drain

Posted: Sun Jan 01, 2017 12:26 pm
by Des Moines Boater
I agree. It is probably your alternator. Start there and let us know what you find.

Re: Battery Drain

Posted: Sun Jan 01, 2017 12:31 pm
by SthrnStyle3
Mine ended up being the alternator as well.

Re: Battery Drain

Posted: Sun Jan 01, 2017 12:39 pm
by Deano
X 4

First confirmation to make, imo.

Re: Battery Drain

Posted: Sun Jan 01, 2017 2:57 pm
by jopete
do you have anything else going to the battery but not to the perko? like onboard charger or a courtesy light or a 12 volt cig lighter or some other potential draw? could be coming from something like that?

Re: Battery Drain

Posted: Sun Jan 01, 2017 5:08 pm
by SWAMPHUNTER45
Not knowing your exact set up hard to comment beyond what was said by some very experienced friends.

Parasitic drain very common now with GPS, stereo, amp, HID lights etc.

If your old school simple then Starter, Alternator and ignition first places to look.

Also how fast a drain can point to the source sometimes.

Low and slow is often a hard wired float switch

Re: Battery Drain

Posted: Sun Jan 01, 2017 6:21 pm
by pontoon outlaw
:scratch: had a starter do that on my Toyota pickup.... drove me nuts till I had it checked and sure enough BAD......

Re: Battery Drain

Posted: Sun Jan 01, 2017 6:31 pm
by terrible ted
just the basic set up no gps no radio.
So what in the alt drained the bat. This happens just sitting not running.

Re: Battery Drain

Posted: Sun Jan 01, 2017 6:47 pm
by jeepinocala1111
terrible ted wrote:just the basic set up no gps no radio.
So what in the alt drained the bat. This happens just sitting not running.
Correct me if I am wrong but I just went through something like this with the alternator in order to convert a alternator to a single wire they connect inside the housing the hot wire to the coil to excite it I believe it is where you can loose a small amount of power that power excites the coils and this is how they bypass the regulator need. :scratch:

Re: Battery Drain

Posted: Sun Jan 01, 2017 9:35 pm
by SWAMPHUNTER45
A defective alternator diode can cause parasitic drain.

This may not be discovered thru routine bench check fyi

Re: Battery Drain

Posted: Sun Jan 01, 2017 11:23 pm
by skinnypockets
terrible ted wrote:My system stared draining the batteries when the battery switch is left on.

I am open to suggestions.

My thought is to take out one thing at a time until I find the system that shorted?

I start with all the plugs for spot lights.
Disconnect the wires from your alternator and let it sit for the length of time it normally takes to drain the battery. If the battery is still up then you most likely have a blown diode in the alternator. This can be caused by using jumper cables improperly among other things. There can be other causes but this is the most common.

:rebel: :florida: :old_glory:

Re: Battery Drain

Posted: Mon Jan 02, 2017 12:15 am
by Olf Art
I do my wiring on a boat al little different than most .... use a locking Perko switch to completely isolate you battery from the rest of the electrical circuits on you boat when the engine is shut down.

Re: Battery Drain

Posted: Mon Jan 02, 2017 12:52 am
by Hog Guts
Olf Art wrote:I do my wiring on a boat al little different than most .... use a locking Perko switch to completely isolate you battery from the rest of the electrical circuits on you boat when the engine is shut down.
Last boat I mounted the switch on the top of the battery box - as in flush mounted it into the top of the plastic cover. This one I just make sure I use it often enough not to be an issue.... option b is better for everything.


Sent from my iPhone using Tapatalk

Re: Battery Drain

Posted: Mon Jan 02, 2017 6:57 am
by terrible ted
I forgot and left the switch on. Don't want to be camping and have this happen.

Re: Battery Drain

Posted: Mon Jan 02, 2017 7:18 am
by terrible ted
if it is the alternator does any one remember what alternator dick water kit use to come with. I know I found it one time for some one else at auto zone but don't have the info saved.

Re: Battery Drain

Posted: Mon Jan 02, 2017 8:59 am
by SWAMPHUNTER45
Olf mine is set up the same way.

TT can you post a few pics

Re: Battery Drain

Posted: Mon Jan 02, 2017 11:43 am
by terrible ted
I think you guys hit it right. The alternator was warm to the touch. I found it is A Suzuki Samurai. I will say the alternator in no way should be warm when nothing on but the battery switch. I see if the batteries are good tomorrow it only took a day or two to drain low enough not to crank.

Thanks.

I plan on redoing the wiring when I remodel my rigging but don't want to do that until after march.

Re: Battery Drain

Posted: Mon Jan 02, 2017 5:06 pm
by Olf Art
Ted, when you get ready to rewire send me a PM and I'll send you a system that not only is simple, but reliable as a stone. :)

Re: Battery Drain

Posted: Tue Jan 03, 2017 9:52 am
by ddriver
remove battery wire from alt. connect test light from post to wire. if it lights even dim alt bad. if no light look elsewhere for problem.

Re: Battery Drain

Posted: Fri Jan 13, 2017 12:59 pm
by terrible ted
SO YOU KNOW IT WAS THE ALTERNATOR. I thought that was it since it was warm on a cold morning. Disconnected it and the drain stopped. Put a live time one on from auto zone.

Thanks because i thought it would of been a pinched wire or switch

Re: Battery Drain

Posted: Sun Jan 15, 2017 5:30 am
by SWAMPHUNTER45
It is a common thing Ted, glad your all fixed up!

Re: Battery Drain

Posted: Sun Jan 15, 2017 9:28 pm
by terrible ted
Never saw that as an auto mech but that was over 20 years ago when my ASE citification expired.

Re: Battery Drain

Posted: Mon Jan 16, 2017 5:39 pm
by skinnypockets
:thumbleft: Good to know it was a simple fix.
:rebel: :florida: :old_glory: