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A healthy battery reading 12.43 should still be capable of cranking an engine fast enough with enough current left over for the fuel and sparks to start - that is assuming the spark plugs, etc. are also in good condition.
An off-load reading of 12.43 means little on it's own and is only one of a number of tests used to determine battery state. The most important test is to measure the battery voltage while the engine is cranking. It is reckoned a healthy battery attached to a healthy engine, starter, ignition system, etc. will ideally read no less than 12 volts - an analogue meter is best for this test.
12 volts is rather optimistic even for a serviceable system. 10 volts is more realistic and some engines will happily start at 9 volts as long as the cranking speed is still good but any lower and either the battery is in a too-low state of charge, is faulty or the starter motor is taking too much current and needs servicing.
Could b a weak battery. Make shure it has at least 12 volts. Change of temperature will make them act up. Cold cranking amps could not b up to par. Try jumping it with a known good one. If that dosent work check connections at bat, starter& especially the ground. Take negative cable off where it goes (bracket,motor,) &sand area clean, apply dialectric grease. A star washer under cable will help greatly. Try start again. Much luck 2 u.
What are you working on? Make, model, etc. Check the wires for corrosion as they can cause symptoms of a weak starter. Also, was the engine acting irregular prior to the starter problem. Bad bearings can cause this too. Wouldn't hurt to bench test the starter. Just because its new doesn't mean it good. thanks
the first thing that you should always check is the battery and the starter connection.An excessive resistance of your high amperage circuit is an overlooked problem that can cause your volts to drop in your batteries. Check to see if the cables are corroded, damaged or loose.The connections will need to be connected if you begin to notice that your battery is losing voltage. If you are using an ohmmeter, you may not be getting an accurate reading for your battery. This is because all that this meter will measure is continuity. It does not measure its ability to be able to handle a high amp current load. There are ways around this to be able to get an accurate read on your battery.
A Voltage drop test is the most accurate ways to test the connection on your battery. You will not have to disassemble anything, so it can be done quickly. Get your digital volt meter to test the voltage drop once you have successfully created a load in the circuit that will need to be tested. If your circuit or the connection has too much resistance, then some of your voltage is going flow right on through your digital volt meter. This will give you a voltage reading.
Hi Mark, I would agree with your diagnostics. If you have replaced the battery already before replacing the starter motor make sure all the connection including the negative connections are clean and making good contact. Once that has been done and still no improvement go for the starter motor. Regards John
remove the buzzer. might find location here. https://www.google.com/search?q=chime%2Fbuzzer+location&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
load test battery it's usually free. have alternator tested could have low output. next is the starter. Check connections then use jumper cables to run motor. something should show up doing these tests.
1st: Battery needs to be checked (no weak or dead cells) then fully charged.
2nd: If battery is good and fully charged, the problem could be excessive amp draw from the starter, a starter draw test would determine if the starter is drawing too much battery power.
2 problems, first you have bad starter or starter relay for starter staying engaged, keep alt plugged in has nothing to do with starter staying engauged, to test starter relay, jump at relay bat + post with red/bk wire on solonoid, if cranks over without staying engaged, then not relay or starter but rather in your ign switch, ford had bad problems with ign switch some years ago doing that
Well I would start by checking for fuel pressure. Check you manufacturers factory spec for fuel pressure. If the fuel pressure is even 5-10 psi low, it will be a problem. Check for spark when this is happening. Install a spark test between spark plug and wire. If bad or no spark, it may need an ignition module.They will act up when hot.