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26-10-2014, 10:34 AM
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#1
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Registered User
Country: UK
Location: milford on sea/keyhaven.
Occupation: charter skiper
Interests: boats,fishing,shooting,bikes.
Boat make: forgecraft, cobra RIB,cat,scorcerer,ring,driver,phantom,bristol.
Cruising area: solent/needles
Join Date: Nov 2011
Location: milford on sea/keyhaven.
Posts: 83
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mercury 150hp...18volts.
Hi All,
ive got two 1997 150 carbed mercs on my fishing boat and ive got a problem with the voltage on one engine,after aprox 2000rpm both volt gauges go to 18 volts, if i throttle back they go back to 14volts,if i run the boat on just the starboard engine all is ok at all revs.
i have just replaced both regulators with brand new items on the port engine but the problem remains..18 volts, ive put a multimeter on the battery (there are 2 linked) and it shows 13 volts but spikes up to 17.9 as revs increase past aprox 2000 then drops back with rpm to 13 volts.
The tacho for port engine was erratic even with new regulators and has now stopped altogether.
(1) will a stator issue give me high voltage
? (engine starts/runs perfect except for voltage)
(2) how would/can 18 volts get past regulators to battery assuming i havnt bought 2 brand new duff regulators?
All terminals are clean on battery, any help/advice would be great.
regards,nick.
__________________
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26-10-2014, 01:34 PM
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#2
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Registered User
Country: UK
Location: milford on sea/keyhaven.
Occupation: charter skiper
Interests: boats,fishing,shooting,bikes.
Boat make: forgecraft, cobra RIB,cat,scorcerer,ring,driver,phantom,bristol.
Cruising area: solent/needles
Join Date: Nov 2011
Location: milford on sea/keyhaven.
Posts: 83
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If I disconnect one regulator volts and taco are fine and it makes no difference which regulator I use,I've swapped 2 new and 1 old and so long as I only connect 1 then alls fine....can I run one engine on one regulator??
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26-10-2014, 02:06 PM
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#3
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Registered User
Country: UK
Location: Surrey
Occupation: Motorsport Development inc Engine Managment
Boat make: 21ft
Engines: Various
Cruising area: Solent / Kent / Cornwall
Join Date: Oct 2011
Location: Surrey
Posts: 375
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Hmm do the regulators have a good ground on the port engine?
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27-10-2014, 09:06 AM
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#4
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Registered User
Country: UK
Location: milford on sea/keyhaven.
Occupation: charter skiper
Interests: boats,fishing,shooting,bikes.
Boat make: forgecraft, cobra RIB,cat,scorcerer,ring,driver,phantom,bristol.
Cruising area: solent/needles
Join Date: Nov 2011
Location: milford on sea/keyhaven.
Posts: 83
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Quote:
Originally Posted by nickskip
Hi All,
ive got two 1997 150 carbed mercs on my fishing boat and ive got a problem with the voltage on one engine,after aprox 2000rpm both volt gauges go to 18 volts, if i throttle back they go back to 14volts,if i run the boat on just the starboard engine all is ok at all revs.
i have just replaced both regulators with brand new items on the port engine but the problem remains..18 volts, ive put a multimeter on the battery (there are 2 linked) and it shows 13 volts but spikes up to 17.9 as revs increase past aprox 2000 then drops back with rpm to 13 volts.
The tacho for port engine was erratic even with new regulators and has now stopped altogether.
(1) will a stator issue give me high voltage
? (engine starts/runs perfect except for voltage)
(2) how would/can 18 volts get past regulators to battery assuming i havnt bought 2 brand new duff regulators?
All terminals are clean on battery, any help/advice would be great.
regards,nick.
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Hi beyond help, yes grounds are good,I'm concerned how 18v is getting past the regulators to the batteries and onto everything else onboard,I've disconnected the bottom regulator and alls fine,can I run one engine on one regulator? The other engine has enough output to charge and power everything onboard.
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27-10-2014, 02:51 PM
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#5
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Registered User
Country: UK
Location: Surrey
Occupation: Motorsport Development inc Engine Managment
Boat make: 21ft
Engines: Various
Cruising area: Solent / Kent / Cornwall
Join Date: Oct 2011
Location: Surrey
Posts: 375
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Something is not right somewhere. The battery itself should prevent 18v, or would be getting hot if forced to stay at 18v. Needs more investigation tbh.
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27-10-2014, 04:46 PM
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#6
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Registered User
Country: UK
Location: Windermere
Join Date: Oct 2005
Location: Windermere
Posts: 559
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Check For Stator shorted to ground on Voltage reg input.
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27-10-2014, 08:38 PM
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#7
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Registered User
Country: UK
Location: milford on sea/keyhaven.
Occupation: charter skiper
Interests: boats,fishing,shooting,bikes.
Boat make: forgecraft, cobra RIB,cat,scorcerer,ring,driver,phantom,bristol.
Cruising area: solent/needles
Join Date: Nov 2011
Location: milford on sea/keyhaven.
Posts: 83
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thanks, Do you mean check the yellow wires from stator to regulator?
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27-10-2014, 11:07 PM
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#8
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Registered User
Country: UK
Location: Windermere
Join Date: Oct 2005
Location: Windermere
Posts: 559
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Yes. Test resistance test between both yellow wires, and then each yellow to ground. Let us know the value and if its shorted. If the stator is shorted to ground then it can bypass the regulator stage and give constant hi output.
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07-11-2014, 02:16 PM
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#9
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Registered User
Country: UK
Location: Windermere
Join Date: Oct 2005
Location: Windermere
Posts: 559
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Info as promised in reply to your PM.
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12-11-2014, 01:51 PM
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#10
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Registered User
Country: UK
Location: milford on sea/keyhaven.
Occupation: charter skiper
Interests: boats,fishing,shooting,bikes.
Boat make: forgecraft, cobra RIB,cat,scorcerer,ring,driver,phantom,bristol.
Cruising area: solent/needles
Join Date: Nov 2011
Location: milford on sea/keyhaven.
Posts: 83
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Thanks for doing that for me,I appreciate it.
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