Mercury outboard voltage regulator problems. I also switched the meter to AC setting and I read +25Vac.
Mercury outboard voltage regulator problems Find out the causes, costs, and tips for replacing or repairing the regulator, and see the FAQs. Removed the regulator and the tach works fine again. Apr 9, 2020 · I just changed a bad working voltage regulator (881346T ) to a brand new one (6d3-81960-00) and immediately at start up the engine did not run well. When I turn the key on, without sta Aug 7, 2018 · Initially I thought the issue was simply due to not running the engine at high rpms but after doing some digging this sounds to be a problem with either the regulator or alternator on the engine. The voltage regulator is built into the alternator, and doesn’t have a stand alone part number. A few months back I posted an issue with one of my 135 Opti's have low voltage. A few weeks ago I blew main 20 amp fuse that’s under cowl. 0 volts, there may be a charging issue. 8 to 12-volts while underway [on a 2004 Mercury 60-HP outboard motor]. says he has never seen that before that bad. I tested to plug in the new regulator again and the same problem occurred. Aug 27, 2017 · PS: I added a voltage regulator to my triple. Aug 9, 2018 · I tested my voltage on a fresh battery at 12. Nov 22, 2024 · What are the key causes of voltage regulators and rectifier failures in 2-stroke outboard motors with CDI ignition systems?1. 2. If this is happening again, I wonder why they go bad. Wish I knew why. Overheating. Aug 9, 2018 · Hi, I had a similar issues a few weeks back. Plus, if the battery fails to charge continuously and corrosion build-up around the stator’s surface, rest assured that the stator will become faulty!. The brushes have springs that apply pressure, to free it I just pressed it with my finger. Checked the stator output with DVA meter got 26 -27v at 800 rpm and about 75 v at 2000 rpm , I was told that this is within specs. Thanks for your time guys. The symtoms: 1. It seemed like the ignition was effected and after several start attempts it finally ran well at ideal (1000 rpm) for a couple of minutes until I gave some throttle and the engine immediately died. These components work together to convert the alternating current (AC) produced by the engine’s alternator into direct current (DC), which is then used to recharge the battery. However, there are some situations that the regulator rectifiers can’t quite handle. Like, damage to a stator, the voltmeter, and the tachometer showing erratic data, making the battery dead or overcharged, problems with the start of the engine , etc. 5V) from the baseline, i. I learned the hard way that the aftermarket ones aren't any good. This could be caused by problems with the voltage regulator, alternator, or wiring. Nov 10, 2023 · Well, a bad mercury outboard voltage regulator can cause different kinds of problems. Tech. Overnight, I charged my battery and the next day the battery measured +15. Believing the regulator was the problem, I replaced it (Part #883072T) BUT the readings did not change!! Mercury Mariner Outboard Forum Voltage regulator replacement questions. NOTE: We tested the regulator-rectifier on a Yamaha T60 outboard, but these tests may be applied to regulator-rectifiers of other outboard makes and models. Boat has two, 2003 135 HP Opti's, three battery system, one Mar 28, 2023 · The most common signs of a bad stator in a Mercury outboard engine are problems with engine activation, lack of power, and misfiring. The one I found is diamond shaped and has studs rather then pig tails. 5V to 14. 32 ($12. The tach worked fine with it--for a while. Erratic tachometer readings. If the voltage doesn’t rise, it implies the alt is bad, and if it rises close to 15V or more, that tells you that there is a problem with the voltage regulator. After crawling out from the aftermath of Irma, I'm finally getting back to troubleshooting the low voltage issue. When I shut her down the tach will still read 1200 rpm. Below is the data I've collected so far. 0V to 2. Jul 23, 2022 · Learn how to detect and fix a bad voltage regulator on your outboard engine. We went for a cruise Jun 29, 2008 · Looking at the rectifier I've got 3 terminals on it, one marked (+) that has 2 red wires on it, one going to the voltage regulator, a second terminal with the grey tach wire and a yellow wire from stator, and a third terminal with a 2nd yellow wire from stator and a yellow wire from voltage regulator. • Defective Battery: A faulty battery that doesn’t Raise the RPMs about 1500 or more, and you should see the voltage rise anywhere between 1. Check the battery: A dead or weak battery could be the culprit, but rule out a faulty regulator first. 7V (14. 9v and didn't increase even with running Jun 8, 2023 · If the voltage is below 13. Apr 13, 2018 · They said the voltage regulator was bad, and they replaced it. When it’s blown it will not turn Ignition on or crank. Battery Issues: • Undersized Battery: Small batteries that cannot handle the charging current from 2-stroke outboards (like Mercury V6 XR6 XR4 XRi Black Max, OMC V4, or Yamaha Pro V) can overload the rectifier. Rather your entire motor charging circuit is contained in the alternator. Outboard Voltage Regulator – PWF's Brandon is having boat motor issues with his 1996 Mercury EFI 175 outboard. One of the major reasons for a rectifier to fail is diode burnout. Should I get a new charging battery to be on the safe side. So, check the charging fuse. If the voltage is less than 9 1/2 volts during cranking there is a problem in the battery s or the Ignition switch Box. I also believe that the voltage regulator under the cowling may have overheated. I traced every wire back and can not find a short anywhere. Mar 3, 2013 · This item: Quicksilver 883072T2 Voltage Regulator Kit for Various Mercury and Mariner Outboards $347. Check the voltage on the red and white Ignition wires at the CD Unit. Jun 27, 2011 · I am possibly having voltage regulator problems with my 2001, 90 hp, 2 stroke mercury outboard. Jun 17, 2008 · Re: 96 40HP Merc bad rectifier/regulator Ok, going to replace the rectifier this upcoming weekend, got the new one at the shop last weekend. This one is square and has six wires. 3V) with the engine running. It only blows the fuse at WOT (5500-6000 rpms) Sep 3, 2023 · The Mercury outboard motor has a sophisticated charging system, comprising the alternator, regulator, and the battery. I tested my voltage on a fresh battery at 12. I have two series 24 combination start and deep-cycle batteries connected by a VSR to help keep the trolling battery topped off. Before it was around 14-volts while underway. Jun 26, 2021 · Replaced voltage regulator / rectifier with an OEM unit. Although the batteries are different brands, they are approximately the same age. What should I do if my Mercury 125 Outboard is overheating? If your Mercury 125 Outboard is overheating, stop the engine and allow it to cool down. Have you heard an outboard motor do this? Plea Today I noticed that the voltage shown on my Smartcraft guage was at 11. Aug 26, 2005 · Re: 2005 mercury 50 ELPTO Problem was the voltage regulator and the wiring harness for that was burnt up. The three main causes of your outboard motor’s rectifier failing are listed below. 32 $ 347 . 77/oz) Get it as soon as Monday, Nov 4 Jul 23, 2022 · Usually, the rectifier on your outboard motor is quite strong and durable. My problem was a stuck brush on the alternator. The regulator output measured a constant 12V. Sep 12, 2013 · I have a low voltage reading at my battery (+12. Replaced the aftermarket electric fuel pump with an OEM unit. 9v and didn't increase even with running the engine at 1300 rpms. Feb 27, 2016 · Most regulator issues stem from bad grounds or bad connections somewhere. 8V while running the motor. Brand new boat, 1 year old, what could be the problem, just a bad/shorted regulator, or maybe a shorted or reversed polarity battery. Always replace them in pairs, and always use the OEM parts. There are several sources for purchase but none for test. 3v then started the engine, after starting voltage dropped to 11. I also switched the meter to AC setting and I read +25Vac. Apr 9, 2020 · I even tested to unplug the regulator and the engine ran still well. 2V (even 2. 8V). Dec 18, 2023 · Don’t let a bad voltage regulator ruin your day! Take action: Inspect the regulator: Look for visible damage, corrosion, or loose connections. It then started dive bombing above 5,000 rpm. All the wiring matches up between the new one and old one, except the new one has an extra black wire with a ring connector versus the bullet-type connectors on the other wires. Both are wet-cell lead-acid. Find the voltage regulator-rectifier on your outboard, and grab a good multimeter to test the unit’s inner diodes. Jun 4, 2011 · This year I looked at it more closely and measured ~35V at the stator input wires of the voltage regulator, using a digital voltmeter. e. The old regulator did still charge the battery ok at higher rpm but gave only 13 V at idle (1000 rpm) The new regulator gave 14. I measured right at the battery. I have a 2 year old starting battery that I keep fully charged when not in use with a Minn Kota onboard charger. 5 V at idle during the few minutes I manage to keep the engine running. If it is blown - replace it. Jul 20, 2017 · I've spent considerable time googling "test" for a Mercury 893640T01 voltage regulator and have found none. , it should be around 13. Aug 15, 2020 · I have a 2003 90hp mercury outboard 2 stroke It has always ran perfect. Disconnect the Mercury Outboard switch and reset, if the engine fires, replace the Mercury Outboard switch. When cruising it will fluctuate between 2000 rpm and 4000 rpm. My motor had just about the same hours as yours. I opened the cowling and didn't see any burned wires, connections, or blown fuses. The regulator is on the bench and my multi-meter has a diode test feature. coming back to work okay after throttling back down. 2001 50 hp 2 stroke The tach seems to be working again but I'm worried that the stator May 21, 2020 · In the case of most motors that have a stand a lone alternator like your picture illustrates, there is not a separate rectifier nor a separate voltage regulator. What causes an outboard voltage regulator to go up in smoke? I have a 2003 Mercury 90-HP FOURSTROKE. I smelled a faint burning odor but saw no burnt wiring. mbvsozmktzjirctwtklcjkihndkgjzqtiabapdrckiloultlpvpaizwzwhkpqvwqbvcosm