1994 suburban wont refire

Some cars..the module is affectd if batt ran low..below 12.6v they can be ruind. Test batt for holdn a charge. Same w alternator. Also the main cable from batt to alt cud b worn causing low flow

There is a fuse or fuseable link between the alt and battery, and the alt gets a signal from the key to activate the voltage regulator.
I would check for batt voltage at the alternator and you may need a wiring diagram to check for key voltage.

check the big wire that goes to the fuse box under the hood. there is one that goes from the batery across the radiator shroud. then them. also check the ground from the engine block to the firewall its flat with no coating.

is the battery charged, check the ground wire going to alt, or batt or even frame....

Back to "square one" If battery was drained by a short, etc and sat for a week like that, likely the battery is now doa...Have it tested. Then start checking for source of drain...at this point everything is suspect. Put an ammeter between either battery cable and battery and start pulling fuses till draw is gone. then check system that fuse serves. Yes \, could be a bad alternator but you really should test before wasting time especially if it's not that.

replace power wire from batt to starter

try checking your alternator, charge the batt and then try starting car if the car starts pull off your batt terminals and if car does stall out then 9 out of 10 the alternator is shot, if it doesn't then get a ac/dc tester then put it to the post on the alternator and if it is not putting out 13.8 or 14.o then you have to try to find a short, a bad wire, or a bad ground and if you cant find one then pull it out and bring it to a aoutozone or a advanced outo and have them bench test it.

is your a 12v or 24v some imports are 24v and engine parts are different thanks brian

if you tried to jump the veh. when the batt. died, then you may have fried a fusable link in the harness. use a test lite to (CAREFULLY) look for voltage leading away from the batt. also you may want to check and see if someone can hear the relay click on as you try to start. (it is sometimes hard to hear it, so you want minimum back ground noise). good luck!

First check alt At The Back of Alt Big Red Wire Were hooks to Post (stud) Do you have voltage ?? How Much??
What Voltage do you have at same Place with Engine Running ??
Now At wires Were they plug into Alt ,Top. Wires in White Plastic Clip, Do You Have Powe With Key On ?? How Much Voltage??
Jump across the 2 in the clip (with Engine Running)ONLY TEMPORARY!! Do You Have Voltage at Battery ?? How Much??
If Over 13volts With Clip On (Jumped) You Need A Internal Voltage Regulator ..
Is Batt Light On on Dash ??? Theres A Lot Of Testing You Can Do !!! And I will Need More Infomation to Keep Going ... These are just some Possible Problems No Way In Depth ...
Could Be a Number of things Or May be Just as Simple As a Blown Fuse, Dirty Batt Cables ETC etc etc I Hope It Puts You On The Right track !!!!!!!!!!