57 plate, Ford Focus Zetec, 1.8 diesal. ABS warning light,Steering Failure Assist light and Battery light on again. Alternator replaced 9 days ago, and been sluggish,heavy steering since and now won't start. Any ideas? Feel it's an electrical fault :0(

Looks like you have a few issues there.

1. The battery warning. This is indicative of a weak battery and if your battery is 3 years old or more I would replace it.

2. If you have a weak battery this can trigger other warning lights in the vehicle, typically the ABS warning but sometimes other warning lights as well depending on the electronic features in the car. If you replace the battery this should correct the battery warning and most likely the ABS warning if both of these warnings appeared at the same time.
Normally, once the ABS warning is displayed the anti lock braking system(ABS) will be shut down. Whilst your braking will be normal, if you brake too hard and lock up your wheels on a slippery road there is no ABS assist to prevent the brake lock up which you have when the system is working.

3. If the alternator on the engine is not generating sufficient power and thus not charging the battery at all, or very little, you will likely get a battery warning light. I don't know if your 1999 vehicle has a warning light to indicate a faulty alternator or not.

4. Check Engine Light.
You suggested the CE warning has been showing up for a few days and before the battery and ABS warnings popped up.
The CE warning can be caused by dozens of different engine issues.
The vehicle needs to be scanned with the appropriate scan tool to see what fault codes the onboard computer is generating because if you have a CE warning light there will be fault codes generated 99% of the time.

Once these fault codes have been pulled the mechanic can start to diagnose the cause of the problem or problems. Each engine fault code your car's computer is generating can be caused by different types of problems so it is important that they diagnose the issues correctly. Otherwise your Check Engine light will remain on as long as the causes are not identified and fixed.

Ford Focus engine diagram Ford Focus engine diagram - Ford Focus engine Zetec-E 1,8-2,0 l 16V Ford Focus engine diagram - Ford Focus engine Zetec-E 1,8-2,0 l 16V

1 - a tank of the hydraulic booster of a steering; 2 - a plug mouth oil-jellied; 3 - a tank of a working liquid of a braking system and clutch; 4 - the assembly block of safety locks and the relay; 5 - an air filter; 6 - a windshield washer reservoir; 7 - the accumulator battery; 8 - the identification tablet; 9 - a measuring instrument of level of oil; 10 - an expansion chamber of system of cooling.

Ford Focus engine diagram Ford Focus engine diagram - turbo-diesel of 1,8 l Endura-DI Ford Focus engine diagram - turbo-diesel of 1,8 l Endura-DI

1 - a tank of the hydraulic booster of a steering; 2 - a plug mouth oil-jellied; 3 - a tank of a working liquid of a braking system and clutch; 4 - the assembly block of safety locks and the relay; 5 - an air filter; 6 - a windshield washer reservoir; 7 - the accumulator battery; 8 - the identification tablet; 9 - a measuring instrument of level of oil; 10 - an expansion chamber of system of cooling.

So many lame responses...I went through this same experience and can tell you in my case it was the alternator. All of the warning lights such as the ABS light, airbag light, the warning about the brakes are all because the alternator is not providing the DC voltage all of the car's sophisticated electronics need to correctly monitor these subsystems' status. Mine left me high and dry by the side of Interstate 5 needing a tow. The low battery warning was off and on for about an hour before all of the other warning lights came on, and then about 5 minutes later every needle on the dash went to zero and the car died. After sitting waiting for the tow, it did start up again, but we got it towed to a dealer (thank god it got us within 8 miles of a dealer! the first warnings started when we were in the sticks) who diagnosed it as an alternator. $1200 and two days later and all is well again.

hi chances are it a fualty relay have this checked this wiil save you checking the abs and may well save you money good luck if this helps please rate this answer

Most likely it is the ABS module is going bad and needs to be replaced or rebuilt at www.bba-reman.com, hope this helps.

disconnect battery when not using car and see how it goes if starts ok then a diode is shorting back to earth ,change the altenator and yes you can do it yourself

The first thing i would do is check the wiring on all four wheels.It could be a faulty solenoid.The next thing is a diagnostic check.

You need to get a diagonstic check as sooon as the light comes on, dont turn ignition off as thi may delete the fault code Good luck Davelee

may have problem with selonoid on top of starter jamming give it a tap with hammer then try