focus st mk2 new alternator broken after 50 miles
#1
I'm Finding My Feet Here Now
Thread Starter
focus st mk2 new alternator broken after 50 miles
My brothers focus ST broke down again. After replacing the alternator yesterday i went for a drive after about 50 miles driving the alternator possibly broke again. The battery doesn't charge and the battery light on the dash is on.
The first time (a week ago) my brother stranded with this car because of an empty battery. The alternator did nothing and the battery light on the dash was off!!!
what could this be that the alternator doesn't charge and broke again within 50 miles?
The first time (a week ago) my brother stranded with this car because of an empty battery. The alternator did nothing and the battery light on the dash was off!!!
what could this be that the alternator doesn't charge and broke again within 50 miles?
#6
I'm Finding My Feet Here Now
Thread Starter
Got a brand new Denso in it. Replaced the ground wires to the battery and the supplycable for the alternator.
But it charges with 100Amps. way too much for a charged battery with nothing on. Maybe it is the smart charging that gives the trouble.
Do you need to reprogram the battery with a ECU diagnostic when you replace a battery on these cars?
Have heard that BMW and VW will charge at max if you dont reset the computers after disconnecting the battery
But it charges with 100Amps. way too much for a charged battery with nothing on. Maybe it is the smart charging that gives the trouble.
Do you need to reprogram the battery with a ECU diagnostic when you replace a battery on these cars?
Have heard that BMW and VW will charge at max if you dont reset the computers after disconnecting the battery
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#9
Wahay!! I've lost my Virginity!!
Exactly, that 100 amp has to go somewhere, if there is nothing asking
that amount the alternator won't supply it.
All modern cars have smartcharge alternators, no escaping that.
It's needed to lower emissions, it means the alternator will start charging at
full power whenever there is free energy, e.g. when you lift your throttle
going at a trafficlight, the engine on the overrun.
More modern cars need a AGM battery, these batteries can be left in a
partly charged state so that there can be "free" energy stored in it.
that amount the alternator won't supply it.
All modern cars have smartcharge alternators, no escaping that.
It's needed to lower emissions, it means the alternator will start charging at
full power whenever there is free energy, e.g. when you lift your throttle
going at a trafficlight, the engine on the overrun.
More modern cars need a AGM battery, these batteries can be left in a
partly charged state so that there can be "free" energy stored in it.
#11
I'm Finding My Feet Here Now
Thread Starter
It charges 100Amps with the orginal calcium battery (12.5V before i started it).
I replaced it with a lead battery (12.6V before i started it) and it charges 40Amps now. still a bit high i think, with no use of radio lights etc...
So i think the battery is dead. But does a diffrent battery lower that 40Amps?
The voltage is 14.3 on battery and 14 when plugging a OBD reader.
I replaced it with a lead battery (12.6V before i started it) and it charges 40Amps now. still a bit high i think, with no use of radio lights etc...
So i think the battery is dead. But does a diffrent battery lower that 40Amps?
The voltage is 14.3 on battery and 14 when plugging a OBD reader.
Last edited by carbon1993; 11-06-2017 at 07:39 PM.