The big fat lug connects the big red wire which charges the battery (BATT), the two smaller ones are the FIELD and SENSE. My 140 amp powermaster (#37294, one wire) GM style alternator has started overcharging recently. The wiring in the cars is only designed for the lower rating of the stock alternator. I wasn't going to record today's episode so I apologize because I wasn't prepare and the illumination sucks. If voltage seems to fluctuate during your test, switch your voltmeter to the AC voltage scale and take another output voltage reading with the engine still running. You may have to register before you can post: click the register link above to proceed. Trying to figure out an alternator overcharging issue. Does it check the vehicle’s voltage internally or from an outside source? The Delco is a little-used 135A unit from Alterstart. Naturally changed the alternator not knowing gm since 2010 no longer puts the regulators in the alternator. Overcharging alternator and buzzing voltage regulator Interiors, Dash, Lights and Electrical Overcharging alternator and buzzing voltage regulator - Page 2 - 6066 (1960-1966) GMC Truck Club Pay Dues or become a Site Supporter Which do I believe or is there more testing to be done. My GM alternator nightmare continues. Hi, this is my first post to the forum. Go look at Ammeter and at idle it's at about 30 amps out. Alternator on my 07 Trailblazer is overcharging. Battery is in the trunk and using 00 wire. If the alternator bearing noise are the only problem, then you can save a boatload by replacing bearings yourself, as I described in an earlier section. Alternator overcharges battery Impala How to fix an Alternator that overcharges battery Impala. I'm on my third rebuilt unit from O'Reilly's. Also put in new battery at that time as. Jan 16 2013, 3:52pm Keep in mind with colder temps, the alternators will put out higher than "normal" voltage to drive a charge into the battery. What I've read is the regulator is in the bcm? Most claim that a 15 volt charge indicated is definitely signs of an alternator overcharging. Anyone been successful in lowering the max voltage output from the alternator? Back in the shop on 2/11/2019 with bad alternator again. Re: Alternator overcharging I hope one o fthe 3 wire connections isn't external sense.. if so.. I put a volt meter across the battery terminals while running and it reads about 14.3 - 14.5. just for the hell of it i went to start my truck and the battery was too weak. The alternators seem to work okay for a short period of time, then they start overcharging. If the output voltage reading is 16 volts or higher, there's an overcharging problem. If you have a poor connection anywhere that the sensing wire is connected to it may cause the regulator to sense a low charge and increase the field current to the alternator field causing it to overcharge. The alternator is a generator that produces Alternating Current (AC), similar to the electrical current in your home. One of the key differences is how the internal voltage regulator determines charge rate. Could a bad fuse or relay prevent a new GMC alternator on a 2003 Yukon from charging? All connections/grounds are tight. It's likely to go out again as charge voltage can go high-er than needed without external sense lines hooke dup. If communications were lost between the PCM and alternator, the PCM would turn on the battery light, but the regulator would still charge the alternator at about 13.6 volts. I've invented perpetual Electricty !! In less than 2 years and 15,000 miles, I've had 4 different GM alternators on my Sammy. Hmmm, At fast idle it's pegged at 60 amps out . OUCH ! I tightenen it up. Lubed them up and they quiteted down a bit but the alternator belt would not. Re: CS144 GM alt overcharging, 16v, options? Bought a replacement alternator but I am sending it back as I measured and have seen it running over 16.5V. All seems well except my volt meter reads 15 - maybe a little more. WHY alternator is overcharging bat - Answered by a verified Mercury Mechanic. Its a 351w with a new 3 wire GM alternator and VDO gauges. You can find an alternator rebuild kit for about $25-$35, which will include the bearings you need. The alternators were bought from O'Reilly's auto parts. Re: Alternator Overcharging? At idle, voltage is only 12.5V, but when the rpm is brought up, voltage is over 17V. One wire alternator overcharging battery; If this is your first visit, be sure to check out the FAQ by clicking the link above. I put a brand new and fully charged battery in at the same time the alternator was changed, so I … I keep blowing out flasher relays, oil pressure switches, and heater blower fuses in my truck, so I decided to check the voltage at the battery when at idle: 15-15.3 volts. Sometimes it will be at 12.5 to 13 which I think is normal. Self-Exciting Alternator makes no need for Alternator Wiring Diagram The Self-Exciting alternator is an alternator that has a special voltage regulator that doesn't need an ignition wire to activate it.This is usually based on a chevy alternator type and only requires a battery wire … The manual says the regulator should keep it to a max of about 14.5V. This is the clincher though, I put a new alternator on yesterday assuming that the reg was gone, and it's the same thing, it's almost like the truck is running directly off the alternator, it gets warmer than it should, but the battery seems to be charging, it starts well and will charge at … It was introduced on the 1969 Corvette, and by 1973 most GM built cars and light trucks used this model alternator. ! If you add heavy loads, driving lights, high power stereo, etc, you can exceed the capacity of the wires. The above alternator is from a 90s Land Rover application. This time the alternator is overcharging. Hey all. To start viewing messages, select the forum that you want to visit from the selection below. Alternator Communication Lost. Context is concern I'm overcharging my AGM battery (actually a 2nd auxiliary battery), since I'm seeing upto 15.3V on occasion, and AGM max is …
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