1983 evinrude 150hp TRXCTB - charging problem

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dmscarp

Cadet
Joined
Jun 24, 2011
Messages
25
Hello All, another problem to solve. I have been noticing that my battery always needs to be charged after a couple of trips. I thought something must be sipping at the battery so i started disconnecting it after a ride. On the next trip it starts sluggish until I charge again. I recently lost my tach and upon reading other posts I replaced the rectifier. This got the tach working, and my meter at the battery terminals reads 12.3 at idle and 12.45 at 2500rpms. Should that read be over 14.0?? I also noticed wide open throttle gets me 4000rpms but I have read it should be turning 5500 and it sounds like it wants to. I got this boat 2yrs ago and it always ran at 4000. I have had a local guy switch out the stator last year with another used one with no difference in preformance. I think I have the 10amp charging system. Any help would be great.....thanks for all help in the past also !!!!!!!
 
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boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
Re: 1983 evinrude 150hp TRXCTB - charging problem

There is a dial on the back of the tach. What position is it set at ??
 
stylesabu

stylesabu

Master Chief Petty Officer
Joined
Aug 2, 2009
Messages
849
Re: 1983 evinrude 150hp TRXCTB - charging problem

you need over 12.6 whe running for alt to be charging
 
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emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: 1983 evinrude 150hp TRXCTB - charging problem

The tach is set correctly, at 6. That engine should be propped to run at or just above 5500 rpm's. For some reason it is way low. At that low rpm the engine is considered to be lugging-not good for long engine life. Some things to consider regarding your voltage issue: You've done the correct thing by replacing the rectifer. Your engine has a regulator on it. That will knock the voltage down somewhat when running. (the unregulated engines will run up to 16+ volts regularly.) Yours won't run that high due to the regulator-probably more like 13.5 volts. Volt gauges on the dash are frequently unreliable due to the wiring under the dash. I'd get a voltmeter and check the actual volt reading across the battery when the engine has run for 20 minutes. It may read different than the dash voltmeter. It needs to show voltage over 12.6 in order to replenish the battery. (fyi-when that engine is running it runs on it's own power. It does not need the battery.
The only time that the battery is used is when it starts, or when the trim is activated. Or you use the horn, radio, etc.)
 
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