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Old 05 June 2004, 15:57   #1
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Battery Question

Hi all

Can someone tell me what size battery I should be using to start my Johnson 150VRO V6

Since buying the boat I've been refitting it out. I've not worried up to now that the engine would not turn over well as the cables were very corroded and I watched the guy I brought it off start it up to run it off a mooring to the trailer. When I flushed it, I cursed the guy for warming it up before I arrived, and run it up with two plugs out to warm up then with all six plugs, I hadn't charged the battery so didn't worry.

However today I've put new cables all the way through the boat, cleaned all the contacts and cables from solenoid etc but with no chance of it starting.

The battery it came with is 500CCA which sounds about right but is only 70AH.



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Old 05 June 2004, 16:11   #2
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your starter motor could be on its way out .
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Old 05 June 2004, 16:56   #3
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Hi 500 CCA is the min. recommended size with 99 mins reserve.
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Old 05 June 2004, 17:13   #4
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Thanks nick, I've just found an american site where I found the Johnson recomendations for my 150, trouble is I'm more confused than ever.

Minimum recomendation is 500CCA or 105 AH, straight forward enough.

So I've just been and had another look at my battery and its marked with the following.

12V 70AH

CCA: BCI 500 IFC 325 DIN 300
I presume this is 3 different standards for measuring the CCA. I wonder which one Johnson use to get their 500CCA?

I'm loathe to go out and buy a 110AH battery and find it still won't work.

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Old 05 June 2004, 17:14   #5
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Be careful not to put battery cables on to long unless they are heavy duty,they can over heat under load if the run is to long.
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Old 05 June 2004, 17:17   #6
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How far is the battery from the engine and what size are the cables, do they get warm when cranking?


Edit: Wayne beat me to it.....

Edit 2: Try connecting the battery close up to the starter with jumpleads if it's a long run of cable and see if it cranks ok.
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Old 05 June 2004, 17:28   #7
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When chargeing up the battery look to see if the plates in side are bubleing, if you have a bad cell it will not fiz when charged! Or get a Hydrometer to test the specific gravity which will tell you if you have a bad sell! you only kneed one bad sell & the battery then charged will only be giving out say 10 to 11v when you should have 12.5v from a good battery!
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Old 05 June 2004, 17:34   #8
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Hi all

I've replaced the cables with heavy duty ones that are much thicker than the originals, so I'm presuming they are OK, particularly as they are about twice the size of the cables on my 3.2 litre turbo Diesel Shogun, although much longer (5M).

I tried to get a set of jump leads on the engine but its difficult without shorting the +ve to the block, I was thinking about making up some shorter test cables but will need to go and buy a couple of metres of +ve and -ve on Monday, unless Halfords sell it of course on a Sunday.

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Old 05 June 2004, 17:38   #9
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Hi invest in a Multimeter when you are in Halfords for under A tenner you will be able to see how many volts you are getting out of the battery!
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Old 05 June 2004, 17:47   #10
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Nick

I've had my avo meter on the engine and I'm getting a full 12.5 Volts on cranking, unfortunatly I can't use my Hydrometer as its a sealed for life battery made in black so you can't see the bubbles during charging, preffered the old fashioned ones better.

The other thing I may do is rig up a ammeter to check the current. Mind you for all that trouble I may as well go and buy a 110AH battery as it'll always be useful on the boat anyway.

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