Went out to start my truck this morning, I turned the key and everything starts flashing all at once, my speedo is going from 40-120 back and forth same thing with the tach it keeps flickering and staying at like 4.2k. When I try to start it it just clicks like I have a dead battery. Tried jump starting, disconnected both batteries checked pcm fuse still doing it. I noticed its not making that clicking sound under the hood with the key turned on before you start engine, and my battery voltage gauge is sitting on 0 too. What in the world is wrong with this thing Thanks for any replies

 

Check the battery connections, they might be loose causing it to get voltage and loose it quickly.

 

Thanks for the reply, checked battery connections again...sanded the terminals, still nothing. When i turn key on everything is still flickering and now the horn honks.

 

got 2 codes...a p2509 and a p1754. The horn is very weak and the radio dont work anymore

 

2509 ECM Power input signal intermittent

 

I got the batteries getting charged at autozone right now then they are gonna test them...what can I do about the 2509 ecm code?

 

See THIS post

 

I appreciate all the help guys...problem fixed. The passenger side battery was shot. Got a new one and it is running great. Thanks again

 

There is also a flash for the 2509 if it trips with a good Batt.