what size cranking battery

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msn26753

Cadet
Joined
Jul 14, 2013
Messages
26
I have a 1990 mercury black max 150.. how many cranking amps should I need at minimum? I know the more the better but I just got a new battry with 445cca at 0degrees and 575 at 32degrees. Im having trouble with battery and I think it may not be big enough..
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,149
Re: what size cranking battery

That battery is a 24 series right? That is all you should need. If she cranks slow, clean the battery cables. Look for corrosion on the whole length of the battery cable, under the insulation
 
M

msn26753

Cadet
Joined
Jul 14, 2013
Messages
26
Re: what size cranking battery

I changed battery out to a 800cca at 0degrees.. hopefullt this mihht do trick. The original battery would die out on third startip. If your fishing you dont have enough time to recharge battery in between stops. Also tilt and trim kills battery quick as well.. Hopefully it was battery and not my stator or anything. I willbfind out today... rhanks..
 
BatDaddy1887

BatDaddy1887

Chief Petty Officer
Joined
Jan 18, 2009
Messages
463
Re: what size cranking battery

I have always used a 950CCA with my 1988 Merc 115 inline 6. It may be overkill, but it always starts my engine.
 
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Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,149
Re: what size cranking battery

Hopefully you had a bad battery.

Since your motor is supposed to have a good charging system, the battery should never go dead. You might test charging system.
 
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