Boat Batt. Issues...HELP

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10-13-2008, 08:31 AM
Dixie Boy

Boat Batt. Issues...HELP

I have a 997SI and have it hooked up to the cranking battery. When I start the motor it shuts down the 997, not enough voltage. My thought is this, I buy another deepcycle batt & run all the electronics to it, let the cranking batt do its only job, and have the 2 trolling batts do their only job. Does anyone have this set up, if not what do you have???
10-13-2008, 10:16 AM
rockmike

Quote:

Originally Posted by Dixie Boy

I have a 997SI and have it hooked up to the cranking battery. When I start the motor it shuts down the 997, not enough voltage. My thought is this, I buy another deepcycle batt & run all the electronics to it, let the cranking batt do its only job, and have the 2 trolling batts do their only job. Does anyone have this set up, if not what do you have???

I had this problem when I first got my boat. The cranking battery just didn't have enough reserve. Replaced it with the largest marine battery I could get at Wmrt, and no problems since.
10-13-2008, 11:24 AM
Crappie Chatt

You also might want to check the draw from your starter. If it is pulling a lot of amps, that would be causing your problem. <*)}}}><
10-13-2008, 11:30 AM
Dixie Boy

CC how do you check the draw from the starter? I am an idiot when it comes to engines, bare with me!!
10-13-2008, 12:26 PM
speckfinder

also make sure all connections are clean and tight
10-13-2008, 12:27 PM
Cane Pole

Quote:

Originally Posted by Dixie Boy

CC how do you check the draw from the starter? I am an idiot when it comes to engines, bare with me!!

Use a dc current clamp, or let the auto store check it for you. Prob easier to tow the boat to the shop rather than pull the starter...:)

Could also be a weak battery.
10-13-2008, 02:09 PM
beagle man

that's what happened to me,I changed the deptfinder to it's own battery and of corse no problem anymore. lots of draw on the battery starting the motor. good luck
10-13-2008, 02:36 PM
Cane Pole

Quote:

Originally Posted by beagle man

that's what happened to me,I changed the deptfinder to it's own battery and of corse no problem anymore. lots of draw on the battery starting the motor. good luck

Smart move....
10-13-2008, 08:12 PM
Dixie Boy

Brand new Optima d34m. Going with the d31M and see if that works. How do you charge the batt for the depthfinder, 3 bank charger or relay the cranking batt to the depth batt & let the altinator charge them both?
10-13-2008, 09:32 PM
CatFan

Quote:

Originally Posted by Dixie Boy

Brand new Optima d34m. Going with the d31M and see if that works. How do you charge the batt for the depthfinder, 3 bank charger or relay the cranking batt to the depth batt & let the altinator charge them both?

If the alternator isn't keeping one battery charged, it probably won't be much use trying to charge two batteries. If you aren't charging your cranking battery between trips, there's your problem. The outboard can't keep up unless you make plenty of long runs.
10-13-2008, 09:42 PM
Cane Pole

Quote:

Originally Posted by Dixie Boy

Brand new Optima d34m. Going with the d31M and see if that works. How do you charge the batt for the depthfinder, 3 bank charger or relay the cranking batt to the depth batt & let the altinator charge them both?

Your question is unclear.

If you add a separate "electronics" battery and bridge( parallel) this battery with the start battery, you only increase the amp hour rating. Note that if you decide to do this, you should match batteries of the same type and ratings.
10-24-2008, 12:17 PM
Scrapper

canepole is right...there is a "bridger" that will tie both batteries together and allow the engine to charge both at the same time...although this can put more strain on your stator/rectifier...are you using wingnuts?? You would be suprised and how a set of stainless hexhead nuts and lock washers can help you if you only hand tighten with wingnuts on your posts. A simple multimeter set to DC can check your output from your stator on your battery...should be around 13 or so at idle...put it on muffs or idle in the water to check that...as said before though check all those connections...if one is bad or the ground is bad or coroded you will lose to much juice when trying to start and it will go off...can be a real pain when you gotta find satilittes again on the gps
10-24-2008, 12:34 PM
Cane Pole

Quote:

Originally Posted by Scrapper

canepole is right...there is a "bridger" that will tie both batteries together and allow the engine to charge both at the same time...although this can put more strain on your stator/rectifier...are you using wingnuts?? You would be suprised and how a set of stainless hexhead nuts and lock washers can help you if you only hand tighten with wingnuts on your posts. A simple multimeter set to DC can check your output from your stator on your battery...should be around 13 or so at idle...put it on muffs or idle in the water to check that...as said before though check all those connections...if one is bad or the ground is bad or coroded you will lose to much juice when trying to start and it will go off...can be a real pain when you gotta find satilittes again on the gps

I agree about the hex nuts. A loose connection will cause a dc voltage loss and some arcing, which can cause corrosion at an accelerated rate.

Wingnuts belong in Washington.