The other day I noticed that my alternators voltage regulator is fluctuating all over the place when the outside temp is cool. i know the wire is good cuz it was reading on both ends the same as the battery when i have the wire connected to the selniod. The alternator is charging 17-18 volts at fast idle. Batteries cranks the starter quickly and it does not seem to lack any electric power. I would swap it in for another unit. So, he took it out, topped off all the cells and dropped it by my place to go on my tender. Alternator is putting out 17- 18 volts. My alternator would run a little low on volts at idle when I had all my spot lights on so I switched to a high amp alternator which also suggested buying their heavy-duty cable which was also very high priced so I just went to a local welding supply company bought the length of welding cable I needed and they installed the proper connectors on the ends for a total cost $30. Take the car or the alternator to an Auto Parts store and have them load test the alternator to be sure. If after a five mile drive your alternator is charging over 14.2 volts, the alternator will boil the acid out of the battery and warp the plates inside the cells. - alternator is putting out 19.7 volts have replaced it 3 times what could the problem be The other wire goes to the gauge battery/charge warning light. If it is makeing a noise or is not putting out at least 13.5 volts it is bad. I already replaced the ELD and that made no difference. 2002 Moomba Outback V 310 Indmar TBI I replaced my alternator because I kept draining getting low voltage. I have a 2006 GMC 1500 with the 5.3 I have 15+ volts at my Battery, (actually from my alternator).. The regulator might not have the correct reference voltage, so it's putting out too much voltage. My question is this, Does my truck have an external Voltage Regulator? It is best to check both for consistency. https://www.tomorrowstechnician.com/toyota-charging-system-diagnostics However, your problem may be deeper than that. If your internally regulated alternator is putting out 16CV thenn it is bad. In fact, if the alternator is not working perfectly, your Dodge will soon begin to experience serious problems. Turns out the 175A mega fuse had blown (or cracked internally? Messages: 427 Likes Received: 61. I have changed the battery and the alternator, but it is still running too high. I tried the search, but couldnt find an answer. I'm not sure about that configuration, but yes, your alternator should be putting out at least 14 volts. the voltage on each battery may not always be the same. The alternator is a "Tuff Stuff" brand 80 AMP internal regulator. It's on a 350 SBC in my T Bucket. Anyways, the system is stable and steady and not really causing any problems or any fluctuations now but still charging at 15.1 volts. I have pulled out the alternator is putting out 19.7 volts ? This morning, I hooked his battery back up, then left for work. I wanted to check my alternator's output directly, so I found the positive cable, uncovered the rubber housing, and put my multimeter lead on the nut, then I grounded it on part of the alternator housing (and again on the engine block) -- the alternator read an output of 14+ volts. I installed the new alternator and it still is putting out 11.8 volts. Keep charging at 17 volts and you will ruin the battery. https://axleaddict.com/auto-repair/Alternator-Problems-Troubleshooting I'm not sure what the effect would be if one of those wires were broken or disconnected. It should be around 14.1-14.2 max right? My brother checked the alternator, and it pumps out around 12 volts I'm just glad it didn't roast the rest of my electrical system. The batteries are not even warm to touch after a half hour of driving. Tonight, I put a volt meter on it, and found it reading almost 18v. Revving the engine can top me out at 13V. Most gasoline cars have a 12 volt system which is what the voltage should be !2 sounds a little low. Get the correct alternator for the car and you may have to go to the local Mazda dealer to get the proper alternator. That muc voltage ouptut will fry a battery in no time. But because the contact points are mechanical, they can pit and burn just like ignition points. So I checked the voltage output at the alternator, 28 volts!! my alternator was putting out 17 volts about a month ago, driver side battery registered 15, and the passenger showed 17. when i disconnected the alternator and measured it directly it was 40 volts. My voltage guage usually points near the red mark at 9-10 volts. I have a plow on the truck, but have unhooked it to see if that might be the problem, no change. yet another possibility is the refurbished alternator too. i have a t bird that puts out 14 or 15. i have pulled the wire that comes from the alternator off the selniod and check it with my voltage meter and it was not putting out a charge at all. Why is my alternator hot? The meter isn't broken, it read the standing voltage fine and the charging voltage from my charger fine, within 0.1v. Reading 15.2 without a load and 15.8 to 16 with a load but never goes any higher. They can stick closed, which makes the If the alternator is putting out too much voltage (15+ volts), it is likely your battery acid will boil over out of the battery. When we start the car the gauge reads 15V. The battery will hold to about 14V for a while and then gradually go up from there. A car alternator needs to be putting out at least 13-14 volts (ideally between 13.8 and 14.2 volts) to effectively charge a 12 volt car battery. Discussion Starter #17 size, all I had to do was drill a 5/16 hole and the light just snapped right in. (2003 Ford Windstar) My Van battery died when the weather was really cold and it had to be jumped. General Mopar Tech Discussions. So I drilled the hole right above my Volt meter on my Lately my alternator began charging at 15+ volts. The alternator on your Dodge, whether it's a car, truck or van, is an essential piece of its electrical system. 16V is way more than a regulated alternator should put out. The fact that you're getting such a high voltage output means that the voltage regulator in your alternator has crapped out. I replaced the alternator, checked all the wiring, checked every ground under the hood and everything seems fine but it still overcharges. Page 1 of 2 1 2 Next > Oct 3, 2015 #1. jenkins71 Well-Known Member. Hello all. I'm replacing my alternator and when I hooked the new one up, it reads 17 volts on my guage and tester. So we put the larger pully on the new alternator. For example, with an improperly functioning alternator, the battery will quickly drain. I hooked it up wednesday night, and it went green within a few hours, so I unplugged it and plugged my bike in overnight. Is 17 volts too much for my battery? I have a 2003 mazdaspeed protg and I replaced my alternator after the battery indicator light came on and the alternator failed the test. Alternator putting out 18 volts why? https://despairrepair.com/check-alternator-voltage-output-all-cars I have no cluster - Answered by a verified Mercury Mechanic the alternator is not putting any volts out ! my alternator is putting out 17 a bum solenoid. so I replace it and it has a whine to it that I haven't heard from my car before, immediate red flag for me, I checked the voltage output and got 18.4 volts!! Just replaced the alternator on the car, it came with a smaller pulley than the old burned out one that was on the car. The battery was then fully charged and running then the battery light came on and the gauges and instrument panel went crazy. Generally the alternator should put out 13 or 14 volts when the engine is running. Source(s): 17 answers. This is just something to check if the battery and alternator test good. The voltage will jump around from 13.8 to 12.5 and 14.4 volts in any order. I have replaced the alternator already. The old one never went over 14V and usually hovered around 13-13.5V. At slow idle, it runs at 16-17 volts. I wish I would have read the forums first before blowing a couple hundred bucks on an alternator. https://www.camperupgrade.com/rv-generator-putting-out-too-much-voltage Remove the alternator, have it bench-tested at a local parts store, and replace if it is really delivering 18 volts. As it does so,m the alternator will be putting out its full charge rate and you will heat the battery a whole lot. I don't have any accessories like a bigger car, would that account for the higher voltage? Some times driving, it will raise to about 12 V, but never above, and the next minut point at 9 again. Not yet, put a new batery in, high vothage is intermittent. 16-17 volts!! Putting out too much volts at idle!!! I have tested both batteries and they are fine. Either way, no continuity). The voltage regulator is an internal one inside the alternator, and you won't save much trying to replace it seperately (it's also a royal pain if you've never rebuilt a later-model alternator before). 16 to 17 volts is overcharging and it needs to be repaired.
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