Question about Sierra Voltage Regulators Voltage Regulator 5723 UPS System

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Starting probs Having fully charged the battery and put it on the car, the battery light goes out when the car has started but when I stop the engine the lit comes on again, does this indicate that the alternator is at fault?

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Ok.... quick test that you can do at your own risk as i'm told it is dangerous.... wear safety googles at the very least... start the car... unhook the battery.... if the car dies... it's the alternator... if it keeps running... it's the battery.... loosen the bolt on the battery post before you start it so it's easy to take off.... after you have removed the connector and determined which is at fault... don't hook up the cable again untill after you shut off the car.... what you need to guard against is creating a spark....


Posted on Dec 16, 2008


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Why is fully-charged battery too low to start within 6 hours?

It is not impossible for new batteries to be at fault , check with high discharge tester, if OK there is a short circuit or something using up power such as stop lights on. to check remove the + terminal on the battery insert a amp meter current draw should be almost zero , small current draw will be from clock ECT.

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Ok here is a weird one, my truck has power, I put the key in, and I have no chip in my key by the way, I turn the truck on it goes through the motions, when I hit the start position all it does is goes...

I have seen this before. And I would almost bet your Battery Voltage at the starter will be 6 Volts or below 9 Volts. It is a combination of several things. There are some TSB solutions for electric problems but you need to get a code from a scanner. Autozone, Oreillys and Advance will scan for free. But your particular problem may not set a "check Light"

If your Battery is not fully charged, which would be 13.2-13.6 Volts, you can have problems from the Antitheft system. When activated the Antitheft system drops the Voltage to a level the starter will not work with, to prevent theft. Have your Battery draw tested and if replaced, only put in a fully charged battery.

Another thing that can happen is intermittent charging. Even with a jumper vehicle, your truck will start and within 3 minutes of having the boost removed your own truck will fail to charge. People have stalled their trucks at 70MPH or after driving for hours they have a dead battery. The dash Voltmeter will indicate a discharge but most people do not look at the gauges.

I suspect if there is a Battery Saver system in the truck, it is that system which may be breaking the power connection to save power from the drain. Unfortunately the drain is the engine running or the starter trying to work. So I suspect the Battery Saver can be a part of the starting problem too!

I hope my solution is very helpful to you. You need further testing to sort this out. I would like to know what you find out to fix this problem.

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I drove my 2001 Windstar to work with no problem, went out to go to lunch and the engine would not start. Put battery charger on it, but it says it is fully charged.

check and clean the battery posts first. Do the headlights work ok, and dim when you turn key to start?
Any clicking?

Try staarting in neutral. turn key to on, apply brake, shift to neutral, try to start.

report results

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I was wondering if there was a way to get the codes from the computer off of my 1999 jeep grand cherokee. one day it just stopped working and i'm pretty sure it's the alternator but not sure. help!!

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After you replace the ignition switch turn the key to start the car and release leave the key were it stops after trying to start wait 10 minutes until security light goes out turn key to full off position then repeat the above procedure two more times for a total of three on the 3rd attempt to start car wait for light to go out then turn key to full off positoion wait 10 seconds then try to start car body control module should learn new pass code and the car should start.
Big john, J@J Automotive

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