Hey guys, currently I have a battery drain problem in every two months. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What can we reliably tell from an in-vehicle battery voltage display? Consult your repair manual for this specifications, if necessary. How and why can multiple people control the Boeing B-29? (Your battery should have a minimum of 12.4 volts.) Is this normal. The battery post gets 12, the "I" wire gets 9v soon as I turn the ACC key on, and that post is activated. The car is a '00 Mazda Miata, no AC, no alarm, just aftermarket radio and amplifier that has been working fine for the last 6 years (but well, there's always the time something goes rogue). Thank you thank you. Learned something new today. If your battery LOAD TEST'S good then you have a loose or corroded connection some where. Ignition switch = on, voltmeter reads the circuit potential. "voltage is 12,5v on the two thick wires at the starter when key switch is off and 3 to 5 volts when turn on or turn to start". Dead battery — is there anything else that caused this? The question is - would some strange drain be able to bring the voltage so low or did the battery simply decide to die? What disease could my time traveler find a definitive 'cure' for, without recognizing the specific disease. I say the solenoid is not functioning because it doesn't even click. Battery Light Won't Go Off Since Changing Battery. With the ignition on and the bike not running switch on the lights and you should see the voltage drop slowly as the lights use up the power in the Battery. Can it be the ignition switch. If it's at the main stud on the starter, disconnect the lead and then measure it. Once the motorcycle's ignition switch is turned to the on or start positions, the motorcycle is being subjected to the same battery voltage that it normally is subjected to from its own battery when it is fully charged, so again, no difference to the motorcycle. Why does the mined block differ so much from the block template? When I disconnected the headlight, the 1v drop went away. When the key reached the start position everything went black and the no noise or movement from the starter. Accessibility. @cklynch "12.65 volts but then I turn the key on and it dropped to 5.46 volts" indicative of a bad battery. (Microsoft SQL Server). When I turn my ignition switch on, I get a.9 (~12.7v to 11.8v)volt drop without the engine running. the voltage is the same running as pre-ignition, only drops when revving up or accessories turned on. The car, miraculously, can start after a couple of tries, and then the voltage goes up … Where are you measuring that massive drop? During starting a healthy car battery voltage should be 10v or higher. 90+% of all MSD box failures are the internal fuse. It’s a fast, accurate, reliable, and professional test for finding unwanted resistance. This is especially true with your boat’s DC electrical system, typically 12 volts. I did the obvious and took the starter back off and checked all the wires and put it back on still the same thing. SYNC Circuit Test If voltage is between 14.2 and 6 volts then SYNC terminal is operating properly. I have a 2003 Chevy Tahoe. If the battery isn’t fully charged, it will diminish to 12.4V at 75%, 12V when it’s only operating at 25%, and down to 11.9V when it’s completely discharged. Why does God appear to Avraham about Sarah’s laughter? When I turned on the running lights, it dropped a tenth of a volt. The voltage should not drop much below 12v and should only decline slowly. Check voltage using ground at alternator, if less voltage then you have a bad ground connection. One of the things we are concerned with on boats is excessive voltage drop. With key on you have voltage drop due to headlight/taillight being on. If the voltage is low with the engine off, its going to drop even further when you crank on the starter. If the alternator should fail, voltage from the diode trio would drop, and once again the lamp would light from the battery voltage. With only 12 volts to start out with, a loss in voltage can have a really profound effect on how your DC appliances operate. The battery was mostly discharged. Had to catch up on the lost day of work. My battery is new/good and alternator gives 14V when the engine is on. How do we know what the atmospheric pressure on Mars is? Your drop voltage should be between 0.3 volts and 0.5 volts: If your reading is below 0.3 volts, have the alternator checked to make sure it is charging. It was the battery, 05/19/2018 by I assumed that because it was holding a good charge it was good. (Do not start engine). I hooked up the voltage meter to the battery, it reads 10v (my battery charger has conveniently decided to stop working properly as well, new one on order) Leaving the meter on the battery, I turned the key - immediate drop to 4.7v I tried a few experiments to isolate the issue, such as: remove headlamp/taillight fuse = 5.5v, disconnect coils 5.~v, turn kill switch to off = 6v, disconnect … site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Then I put the volt meter on the back of the gauge and it measured 11.9v with the lights off although the gauge read 11v. At this time, with 12 volts on both sides, the lamp is out. A perfect voltage with the engine running is between 13.7 and 14.7V. If not, then Alternator #1 (Master) needs to be replaced. Have someone turn key to start position, check voltage at battery, and see if there is a drop, voltage drop should be minimal, if not there is a direct short somewhere in the ignition circuit, which I doubt because it would blow a fuse, unlss you have an external relay for the starter system. I recently changed the starter in it and everything worked fine for one day. This is measured from (-) straight to the battery and (+) at the terminal on starter switch. The voltage of battery stays at an okay ~12,8V when the car is turned off, but turning the ignition on makes it drop to the values as low as 8-9V very fast, like within 30 seconds.
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