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Author Topic:   battery charging?
johnnywhaler posted 08-11-2002 03:57 PM ET (US)   Profile for johnnywhaler   Send Email to johnnywhaler  
The battery gauge has stopped showing my batery charging when I rev engine. Is there a way to determine if it is my gauge, battery or alternator?
Jay A posted 08-11-2002 10:47 PM ET (US)     Profile for Jay A    
You can use a cheap Radio Shack Analog battery tester. set it on the 12v scale and attach the leads to the battery,rev the engine and if the neddle moves up from 12v to 13v - 15v range then it's your gauge. If there is no movement at all then it's a good bet it's your alternator. A good alternator will always show better than 12v even with a bad battery,the bad battery will not "hold" the charge when you shut down.
johnnywhaler posted 08-12-2002 08:42 AM ET (US)     Profile for johnnywhaler  Send Email to johnnywhaler     
Thanks Jay, will do.
johnnywhaler posted 08-12-2002 02:47 PM ET (US)     Profile for johnnywhaler  Send Email to johnnywhaler     
Has anyone heard of a rectifier regulator? When I called Johnson to see if there were any other reasons why battery not charging, they said it's not alternator, it's rectifier regulator, this is on a 93 100 hp Johnson....
Taylor posted 08-12-2002 03:18 PM ET (US)     Profile for Taylor  Send Email to Taylor     
There are lots of electronic guys here to correct me if I'm wrong, so I'll say its the device (usually on the alternator, at least in cars) that turns AC into DC. Alternators produce AC, batteries expect DC.
Taylor posted 08-12-2002 03:20 PM ET (US)     Profile for Taylor  Send Email to Taylor     
I like Jay's advice. What were the results of that?
johnnywhaler posted 08-13-2002 10:36 AM ET (US)     Profile for johnnywhaler  Send Email to johnnywhaler     
Did as you say, whith the engine shut off, my meter says 12.74, reving engine somewhat the meter goes to slightly above 13, although not much more. As long is there is some movement does that mean alternator is working?
where2 posted 08-13-2002 05:37 PM ET (US)     Profile for where2  Send Email to where2     
rectifier (AKA Diode bridge) does infact turn AC to DC. It generally consists of 4 diodes which convert your AC created by swinging magnets around a coil of wire to DC so you can charge your battery and run your DC equipment on the boat. They do go bad, and if your tach is acting up, then expect the rectifier to be the problem.

Generally, anything around 13V means the alternator is working, although you should check it with some other loads running like running Lights and a Spotlight or something that draws a bit of current. If you're still getting around 13v, then swap the gauge and go boating for the afternoon to check everything out.

Be realistic if you use the spot light test though. A 1,000,000CP spotlight usually uses a 100W H1 bulb and draws more current (8.3A) than many outboard alternators put out. OK for short blasts through the night, but not something you want to run all night.

Jay A posted 08-13-2002 06:36 PM ET (US)     Profile for Jay A    
johnnywhaler: Sounds like your battery and charging system are doing fine! Must be a bad gauge. Slightly above 13v is fine,as long as there is additional voltage when the engine is going as opposed to when it's off. Before you discard the gauge, remove it and see if there is an opening on the back. If there is, try spraying some tuning spray(or isopropal alochol from a spray bottle) into it,allow it to dry for a few minutes and hook it up and start the engine. If you are in a salt water environment, the tuning spray with it's alcohol will breakdown the salt.

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