only starts hold key on for 2 seconds than cranks
 

I will try to start the truck it will just click, but if I hold the key on for 2 or more seconds the truck will start slowly. I had the battery tested at advance auto parts and the battery about a year old. I bought the gold series battery to top it off. I checked for short in truck by hooking a dc amp meter to battery to check for any shorts. Its only reading .023 I read as long as it under .050 its fine. It does have factory theft system which going to draw a little amps. Need advice whats killing my battery. Radio goes to AM radio when started and gauges takes about 5 seconds to start working.

Nothing in your post indicates the battery is being discharged.

After the trucks sits for about 4 days the battery dead. The truck doesn't get driven much. Living in Florida and having a motorcycle the trucks sits. It just starting acting up for about 3 weeks now. the truck use to sit a week or two and no problems starting up.

Sounds like a bad battery.

I suggest replacing the battery if it is old.

I thought the same thing but took it to advance auto parts and tested good and the battery only about a year old

Go get it tested again.

I've used the tester a lot, and if a battery is pulled down sometimes it'll read "good - recharge" (or maybe it's "charge required") ..... anyway it'll lead you to believe all is well, just low on charge. Then after a good charging session .... a retest has shown "replace battery". Not always ...... not even "often" ...... but it happens.

Some batteries are less than equal to others, some more so. I put a new group 24 Legend 75 battery (call it #1) in my '77 back in spring of 2002, by summer of 2003 it was no longer reliably starting the low compression optioned 351M in that truck, so NAPA gave me a new one on warranty swap (call it #2). That battery has a date code of May 2003 ...... and it has never once failed to start that '77 ..... even doing so this morning. Obviously #1 and #2 weren't so "equal" .... #2 has way more than made up for any inconvenience, it owes me nothing ..... 12 years later.

Likewise, one day '95 T-bird started making a clicking noise, I just happened to go outside and heard it one evening. Battery was a few months old, group 65. After opening the car and getting in, I could hear noise was coming from the remote entry box in trunk. Battery was dead in car .... I had driven it that very day. I tried one out of another car, noise stopped. I bought a new battery the next day .... no problems since, same car, no other changes, that was 2009 ..... it was not long after I had bought the car, the receipt wasn't in the car, so no warranty for me.

Found out it was the battery although tested good everytime I took it to advance auto parts plus found out it was the wrong battery too. I told them I did the drain test and read good. So they finally replaced the battery and its fine now.