1992 mercury 100 not chargeing

J

josh_2562

Seaman
Joined
Jun 7, 2007
Messages
60
the tach stop working then the battery died. well check it out and its not chargeing. what should i check frist. thanks for any help josh
 
J

jmburock

Petty Officer 2nd Class
Joined
Aug 25, 2005
Messages
174
Re: 1992 mercury 100 not chargeing

Sounds like a problem with the regulator/rectifier..should see 2 yellow wires/2 red wires/ gray wire/ and a black ground. Check all these connections first- sometimes one of the bullet connectors disconnects or corrodes. If your battery is charged, start it up, check your voltmeter, should be producing around 14.5 volts when running with some throttle. If it isn't and the wires are all o.k., then I suspect you may need a new voltage regulator (around $100 but takes about 10 minutes to change it out). Accidently crossing the +/- terminals on the battery one time is all it takes to burn out a regulator..
 
J

josh_2562

Seaman
Joined
Jun 7, 2007
Messages
60
Re: 1992 mercury 100 not chargeing

thanks for the help i did the thing with the voltmeter. i will check all the wire and hope thats it. thanks again
 
J

jmburock

Petty Officer 2nd Class
Joined
Aug 25, 2005
Messages
174
Re: 1992 mercury 100 not chargeing

How much voltage were you getting with the boat throttling above idle. Should be 14 -15 volts (maybe 13.5 - 15 ).. If it was above 15 that might also indicate a problem with the regulator.
 
J

jmburock

Petty Officer 2nd Class
Joined
Aug 25, 2005
Messages
174
Re: 1992 mercury 100 not chargeing

So check the wires.. If you need to replace it, it is part #194-5279 (just do a google search for that number and look for the best price.). One of the easiest things on a boat to replace, just don't forget to cover the base in dielectric grease before rebolting to the aluminum plate (acts a heat dissapator)..
 
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