no charge

coupons420 · #1 (**permalink**) 02-07-2007, 09:00 PM

i have a 73 f100 390 the battery wont charge, and when i turn the key if i have the wire that charges the battery from the alt off the battery it wont have any power? or is that aprt normal i had the alternator cheacked it works. and the wire was cut and reinstaled to remove the corsion

Mil1ion · #2 (**permalink**) 02-07-2007, 09:14 PM

Diodes gone in alternator ?
Voltage regulator toast ?

what rpm was the engine running at when you tested for power?

Don't ever remove the battery cables from a battery with the engine running

timothy47129 · #3 (**permalink**) 02-07-2007, 10:26 PM

One common problem is the connectors that attatch to the voltage regulator.Make sure they fit tight and arent rusted.

coupons420 · #4 (**permalink**) 02-08-2007, 02:25 AM

see if i remove the power cable then remove the alternator wire and put the cabel back on with the alt wire off there will be no power when i turn the key is that normal? but see the car wouldnt run if the coil resister wires were off unless there shorting which means thats why it need the alt wire on?.. hmm ill check that thanks!

coupons420 · #5 (**permalink**) 02-08-2007, 02:29 AM

it was ideling when i checked it and i checked it with the wire atached to the battery terminal so it may not be acurate, and the motor died when i removed the battery cable, which is wrong. i have removed many cables when the car was running and it ran off the alt.

Franklin2 · #6 (**permalink**) 02-08-2007, 11:30 AM

Do you have a ammeter in the dash or a "gen" light? If you have the light, does it work?

Mil1ion · #7 (**permalink**) 02-08-2007, 03:26 PM

You have probably killed some diaods from removing cable & wires while the engine was running.

What you are doing is what they did back in the day of GENERATORS.

It was done to EXCITE the generator into start charging.

when you do this to an Alternator system you screw things up.

ask yourself this question :

When the engine running and I disconnect a wire that is for output..where is that electricity going ?

Hint: It has to Leave the alternator.

coupons420 · #8 (**permalink**) 02-11-2007, 12:20 AM

what im trying to figure out before i ever removed the battery cabel is... why is it that when i remove the alternator wire only and leave the battery cabel on the truck has no power when i turn the key? thats not normal is it?

Franklin2 · #9 (**permalink**) 02-11-2007, 05:57 PM

Power for the truck comes from a smaller wire hooked to the starter solenoid/relay on the fenderwell. The smaller wire hooks to the large stud that is hooked to the battery +. If this wire is connected, follow it along and see if you have a colored rubber thing in the wire. This is a fusible link, and may be burnt out.