python 1500esp not starting

Have you checked the voltage between your ground wire and the constant inputs yet?

I have not checked the voltage between the two yet. I will have to go pull the dog house cover and check that. I wonder if the alarm has a low voltage shut down. The reason i ask is the trucks voltage drops to 10 volts after the fuel pump, glow plugs and starter engage. Thanks Ryan

Where did you measure that voltage, battery? Ignition loom?. You should see at least 12.4 between the ground and any of the constants at rest. Poor ground. Bad battery. Just throwing thoughts your way. That 10 volts worries me. When we do a drop test, if after 10 seconds the battery voltage drops to say 9 volts, it's condemned. On a modern petrol (gasoline) engined vehicle the engine management wont work at under 12.0 volts to fire up the engine, hence the reason you can't push start modern cars, I'm not sure how that applies to diesels.

I think that is my next thing to check. I will go test both of my batteries and maybe try to remote start it with a jumper battery on it. Thank you Ryan

i understand how having a bad ground would make the system drop voltage but if it were a bad battery wouldnt the hummer have a hard time starting with the key too?

Ok I did some more testing. I checked power / ground at the modual and to chassis and got the same readings. At rest I am getting 12.59 and as soon as the remote start engages I drop to 10.20. I also ran wires direct to the batteries and got the same results and same volt meter readings. I tried calling Python but they will not even talk to a consumer. Any other thoughts? Thank You Ryan

hmm. maybe you have something being powered that is not supposed to be powered during remotestart and its drawing too much current possibly something you have hooked up as an ignition that should be powered as an accessory. have you done the same tests using the key instead of remote start?  

I get the same voltage drop with the key as the remote start. there is no after market accessories on the truck besides the alarm. I am still curious if there is a low voltage shut down in the alarm but Python will not accept any calls from anyone who is not a dealer. If there is a low voltage shut down then I should be able to put a capacitor in line and hopefully eliminate the voltage drop. Thanks Ryan