99 k1500 silverado

hi iv'e got a 99 k1500 silverado new body style with the 5,3lit vortec
engine.
my problem is i turn the ignition key on, and everything is fine. lights
come on every gauge reacts and iv'e
got plenty power.When i turn the key to start the engine nothing
happens.somtimes i have to flick the key
about ten times before it cranks over. it starts at once. and then
everything works fine for a week.
i can hear the fuel pump running, and the clicing of some relays.it's just
the last step that fails.
anyone got any ideas?? faulty ignition switch maybe??? in advance thanks

Yes,
It takes about (usually 700 cold cranking amps of battery to spin over a
motor.)
if you battery is weak it will light all the lamps, run the fuel pump and
turn on everything, but when you hit it with the starter motor there just
isn't enough cold cranking amps left to spin the engine over.

Sometimes this can be indicative of a corroded set of BOLTS which on the
Chevy battery posts.

So if you undo the battery terminals (bolts) and examine them carefully with
the rubber pulled back, if you see any GREEN then this MAY be your problem.
that includes any and especially any Green/White corrosion in the BOLT
THREADS.
This problem may be fixed by a new battery, but not for long, Sometimes the
battery bolts may be warm if you try to crank it as the resistance of the
corrosion heats up like a big resistor.

I had my 87 Chevy do this and strand my wife, I replaced the battery and got
it home, next morning same thing, it was corroded terminals on the battery.

The other one I have seen is an alternator which is shorted on one side of
it internal diode bridge, This makes the alternator put out a half wave
rectified signal instead of a fully rectified waveform, So it charges the
battery but only at half the available alternator output. So the battery
stays sort of charged, but not enough and the battery doesn't seem to last
as long either.
so if you put a meter across the terminals of the battery when the truck is
running, the meter must read at least 13.5 volts, and if its not then you
may have a shorted diode in your alternator (there are 4 in a bridge)

See if any of this helps.

--
JAMES HAYES
"Leif Magne Berg" <lemagber.RemoveThis@frisurf.no> wrote in message
news:WoOdnX45nu1bAQzZ4p2dnA@telenor.com...
> hi iv'e got a 99 k1500 silverado new body style with the 5,3lit vortec
> engine.
> my problem is i turn the ignition key on, and everything is fine. lights
> come on every gauge reacts and iv'e
> got plenty power.When i turn the key to start the engine nothing
> happens.somtimes i have to flick the key
> about ten times before it cranks over. it starts at once. and then
> everything works fine for a week.
> i can hear the fuel pump running, and the clicing of some relays.it's just
> the last step that fails.
> anyone got any ideas?? faulty ignition switch maybe??? in advance thanks
>