2002 chevy van 2500 when i turn key to start van

Dodge Ram 1500/2500 (2002-2009) fuses

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Fuse box diagram (location and assignment of electrical fuses) for Dodge Ram / Ram Pickup 1500/2500 (2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009).

Not good fuses to blow. you need to find out why?

31
31 10 or 15 amp except SRT (2006) (15A): Shift Motor and Mode Sensor Assembly (ETC), Powertrain Control Module (Gasoline);

2007-2008 (10A): Powertrain Control Module;

2008-2009 (15A): Powertrain Control Module


4
40 20amp
Base: Power Outlet - Instrument Panel, Power Outlet - Lower Console (2007-2009)
Here are your dash warning lights. The lightning bolt is Electronic Throttle Control, and you can't drive without that. Not sure that your sail and sun is unless it is the Cold Ambient Derate Mode Indicator
You need a local auto electrician. you can't guess stuff like this, it needs a pro grade scan tool computer.

https://www.google.com/search?q=auto+electrician+near+me

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What all does that fused supply B+ voltage too ? Do you know ? That would be your first thing to find out ! Do you know what a electrical distribution diagram is ? Do you know how to test electrical circuits with a DVOM - digital volt ohm meter ? Do you know what a short to ground is ?
Which fuse ? IGN A - 40 amp ,under hood fuse / relay box ? This fuse powers the Starter Relay and Ignition and Start Switch
Does your vehicle have a manual or automatic transmission ? The starter relay could be shorted inside , It's also located in the under hood fuse box . If you pull the relay out of the box it's plugged into an look on the bottom of it you would see four sets of numbers ! 30 & 87 an 85 & 86 . If you were to jump 30 to 87 in the relay box the starter should spin the engine over , not start an run just spin ! 85 & 86 is the control side . Could be the ignition switch !
That 40amp fuse powers a lot of subsystems !

Here is a web site for free diagrams !
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine , Under system click on electrical distribution , under sub system click on power distribution . Then click the search button .Click blue links one at a time . First blue link scroll down to the second diagram . You will see Ign A 40 amp fuse at the top of the page .you will also see it powers the igintion switch ,look at last part of ignition switch , when in start or run that 40 amp fuse powers all those other fuse's plus three relays i see there also . A/C compressor relay , rear window defroster relay ,daytime running lights . Any one of those circuits could have your short . You need to isolate the circuits , pull fuse's till the fuse doesn't blow !

What fuse's ? Ignition , PCM , ? Won't start how ? explain - when you turn key to the start position does any happen ? if nothing happens this is referred to as a no crank - no start , now if the engine turns over but doesn't start , this is referred to as a crank - no start condition. So which does your vehicle have ?

You have a short in that wiring, most likely related to your starting motor. Pull the starter relay (in the underhood fuse box) and try a new fuse to see if that is the case. If so you will need to have the motor checked. If not, there are a variety of systems that use this feed via the ignition switch and each will have to be checked (including the switch). If you need a wiring diagram, try Alldatadiy.com.

It will most likely be a poor earth issue, make sure the earth lead between the battery and the body is good and clean and check the one between the body and motor.
Poor earth connections cause excessive current draw and will blow fuses.

Did you check the fuel pump fuse? It's often all by itself, and not in the fusebox. This is the case on Chevy/GMC C/K trucks, it might be similar on the Astro van.

Ignition switch maybe , GM has problems with switch . Test it ! Do you know how to do automotive electrical testing ? Test main powers to the ignition switch . Back probe the B+ power wires Both are red at the ignition switch ! They get B+ from IGN A & IGN C fuse's in the under hood fuse/ relay box ! One is 40 amp , the other is 20 amp .
This problem your having you say happens when you turn the key , correct ? Turn the key to ? ON - START ? or doesn't matter ? The ignition switch supply's B+ voltage to all the things your losing power to.

Can you hear the fuel pump run when you cycle the key?

make sure of two things one is any wires touching at the starter to ground or melted and or is the starter drawing too much amperage causing the fuse to blow.starter may have a dead short in it.

sounds as if you have a power shortage in the van. first establish what fuse keeps blowing this will help in narrowing down the short.once short is located check all connections ,wires,and plugs.