My battery keeps on dieing on me, the alternator is new, but the battery has been realocated to the back of the car, i think that alternator isnt chargeing the battery, but i jumped started my car yesterday and the car stayed on,what you guys think???

 

make sure your grounds are good and all your conections are good and tight

 

Start the car, disconnect the battery. If it fails to run, it is more likely you alternator. Otherwise, you may have a short somewhere. Have you checked the fluids in the battery?

 

You do know this could possibly fry a bunch of the electronics in his car, right? Not a good idea.

 

any corrosion on the battery cables....or in the battery cables could definitely cause this as well.

Did it start shortly after relocating the battery? Maybe the grounds aren't good after the relocation took place....

 

Explain please, this is just a old school trick. Never hurt my first gen, but, no ECU.....

 

My teachers at my school (I go to a tech school to be an SAE Automtive Tech.) have said NOT to disconnect the battery while the car is running. They said it is NOT a safe way to check alternator efficiency. I don't remember the reason why.

If you want to check if your alt. is putting out the required 14.6v, get a DVOM, or DMM, or whatever...put the positive probe (red) on the b+ terminal of the alternator, and the black probe (negative)wire on your meter to ground. Whatever pops up on the screen will tell you the voltage output of the alternator.

Alt. should put out 14.6v with no acc. on, battery should be 12.6v.

 

/\ correct. also the way to check for drain is to disconnect the neg battery terminal. take a DMM in the amp scale, connect one end of the dmm probe to the naked battery terminal, connect the other dmm probe to the battery cable. should read ~ .1 amp or so. if it is high, start pulling fuses till the draw goes away and you now know which circuit is the drainer. do not try to start the car as it blow the fuse in the meter.

on a side note ALWAYS remove the neg terminal first and put it on last.

 

NEVER DO THIS! Without a bias, the regulator in the alternator will output very high voltages. Some alternators can put out 100V and more. Not sure what the FC alternator will do, but it will certainly be MUCH higher then teh 14V that everything in the expects.

 

The Battery acts like a big capacitor to level out the voltage to the rest of the car. The alternator can put out Massive voltage as stated earlier and the battery limmits that and also creates a smooth flow (if you will) to the rest of the car. I know that this isn't entirely accurate but I'm trying to explain it in a way everyone can understand.

TR

 

interesting! Thanks guys....

 

Did you make sure the voltage regulator in the alternator isnt shot? Is it draining while its sitting?