I have a pair of Mercury 200hp carb engines on my recently purchased 1994 Robalo 2520. Both engines run smooth up to 5,000+rpm's.
I had an issue recently where I couldn't get my tachs to work; traced it back to one of the voltage regulators, which was fried. Replaced one regulator with a used one, and now both tachs work.
At rest with the battery switches off, my batteries read 12.8v each. My port battery is a starting battery, and my starboard battery is a combo starting/deep cycle (house battery). At a 600-800rpm idle, both of them read 13.6-14.4v. When I increase the rpm's to 1,000+, voltage will spike to 15.5-16v and not fall back down until I back the throttles down to idle. This is on both engines, read with both a multimeter at the battery and also on the dash gauges.
It's my understanding that voltage shouldn't rise over 14.4+/- at all, am I correct?
Should I pony up the cash and replace all 4 regulators with brand new ones? It's the regulators that control the voltage output, correct? I understand that if a stator is bad, it will fry the voltage regulators.
Anything else I should be looking at or considering before I spend more money??
Thanks!!
I had an issue recently where I couldn't get my tachs to work; traced it back to one of the voltage regulators, which was fried. Replaced one regulator with a used one, and now both tachs work.
At rest with the battery switches off, my batteries read 12.8v each. My port battery is a starting battery, and my starboard battery is a combo starting/deep cycle (house battery). At a 600-800rpm idle, both of them read 13.6-14.4v. When I increase the rpm's to 1,000+, voltage will spike to 15.5-16v and not fall back down until I back the throttles down to idle. This is on both engines, read with both a multimeter at the battery and also on the dash gauges.
It's my understanding that voltage shouldn't rise over 14.4+/- at all, am I correct?
Should I pony up the cash and replace all 4 regulators with brand new ones? It's the regulators that control the voltage output, correct? I understand that if a stator is bad, it will fry the voltage regulators.
Anything else I should be looking at or considering before I spend more money??
Thanks!!