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Old 26-10-2014, 10:34 AM   #1
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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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Old 26-10-2014, 01:34 PM   #2
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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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Old 26-10-2014, 02:06 PM   #3
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Hmm do the regulators have a good ground on the port engine?
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Old 27-10-2014, 09:06 AM   #4
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Interests: boats,fishing,shooting,bikes.
Boat make: forgecraft, cobra RIB,cat,scorcerer,ring,driver,phantom,bristol.
Cruising area: solent/needles

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Quote:
Originally Posted by nickskip View Post
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.
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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Old 27-10-2014, 02:51 PM   #5
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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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Old 27-10-2014, 04:46 PM   #6
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Check For Stator shorted to ground on Voltage reg input.
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Old 27-10-2014, 08:38 PM   #7
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thanks, Do you mean check the yellow wires from stator to regulator?
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Old 27-10-2014, 11:07 PM   #8
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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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Old 07-11-2014, 02:16 PM   #9
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Info as promised in reply to your PM.
Attached Files
File Type: pdf Stator Test.pdf (125.6 KB, 85 views)
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Old 12-11-2014, 01:51 PM   #10
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Boat make: forgecraft, cobra RIB,cat,scorcerer,ring,driver,phantom,bristol.
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Thanks for doing that for me,I appreciate it.
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