python 1500esp not starting

I just installed a python 1500esp in a 1996 hummer h1 and I am having problems with the remote start not working. Everything on the alarm works except the remote start. When I engage the remote start it waits for the wait to start lam to go out and the the starter engages for a split second then stops and all accessory and ignition power quits at the relays. Any help would be greatly appreciated.

Thank you
Ryan

Also I have tried with and without engine checking also with tach sensing and voltage sensing and I get the same results each time.

Thanks
Ryan

Is there an immobiliser involved?
Try it with the key in the ignition.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

There is no Imobilizer and I did try it with the key in the ignition.


Thanks
Ryan

Increase crank time?

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

I set it to the max for crank time and as soon as the starter kicks it stops. It is like the starter is overloading the system. I even jumped the starter at the alarm relay and it cranks no problem.
Thanks
Ryan

When the starter quits cranking it also kills the ignition, second ignition and the accessory relay as well. It's kind of acts like the brain gets overloaded.

Ryan

Strange, have you thought of running some heavy gauge wires to the battery or checked the voltage between the pos wires and the black neg?

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

i ran across a truck once (best buy installed it) that had a hood pin switch that was adjusted too close. did the same thing. the moment the starter would hit, the hood would shake just enogh to kill the whole system.

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yuk
quiet rural missouri, near KC.
If your system moves you physically and not emotionally, you have wasted your money.

Nice one, and of course that wouldn't show up on pre-start diagnostics.
Try opening the hood and holding the pin down, also use a DMM on continuity to make sure it isn't grounding somewhere.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Thank you for the replies. I don't have a hood trigger set up on this truck. I also isolated the alarm to a separate battery with no luck. I am wondering if the brain is bad.

Thanks
Ryan

disconnect the starter wire completely from the alarm and try to remote start it, does it still shut the ignition off? did you wire all of the 12v inputs to the same 12v constant in the hummer because if you did then its possible that the starter is drawing too much current from a single source.

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X2 with soundnsecurity PLUS did you check the voltage at the unit?
I'm still thinking poor ground.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Ok i disconnected the starter relay and hit the remote start. The wait to start light, ignition and accessory would come on then the wait to start light would go off and everything else would follow. The only thing different it did was after a few seconds it would go through the cycle two more times. When the starter is connected it only cycles once

Thanks
Ryan

ok so something is cancelling the remote start sequence. if you disconnected the starter and it shut off and retried 2 more times that means the alarm sensed that it wasnt running and tried to crank again. the fact that it does not do this with the starter wire hooked up tells me that something is physically shutting off the remote start. possibly the vibrations from cranking are shaking a connection loose or maybe even activating the brake switch long enough or maybe the hoodpin wire is touching ground momentarily, anything is possible so just check everything and make sure all connections are tight and insulated.

hook the starter wire back up and try unhooking the brake wire just to eliminate everything that can manually stop the remote start. also make sure the neutral safety wire is tightly connected to ground or if you are hooked up to an actual neutral safety wire then make sure the shifter doesnt jump around while cranking because this could cause the neutral safety switch to lose ground thus cancelling the remote start.

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I tried disconnecting the brake light feed and bypassing the neutral safety and the remote start still just engages the starter then shuts down all relays. I am not running a hood switch so it cant be that. I don't think it is any of the safeties as the starter would not even try with any of them activated .

Thank you
Ryan

are you using the starterkill relay? if so then how do you have this wired in relation to the starter output from the alarm?

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Yes i do have a starter kill relay. It is wired in between the starter wires. The remote start trigger is on the starter side of the relay. Also when the starter quits the Accessories and ignition quit to.

Thanks
Ryan

somehow something is backfeeding when your alarm sends a start signal and this backfeed is activating a shutdown trigger internally on the alarm. its the only thing i can come up with and what made me ask about the starter kill was because on my old viper 791, which is almost the same as yours, when i would remotestart it and turn the key too much the   antigrind circuit would backfeed power through the alarm and the "brake" light would turn on in my instrument cluster.

it didnt make sense to me either but seeing is believing. and since we have systematically eliminated all normal possibilities now its time to start thinking about other stuff. try unhooking the starterkill but leave the starter output hooked up and see what you get.

another thought, what are you doing with the WHITE/ blue wire?



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Ok i pulled the starter kill relay and it did the same thing again. f your talking about the blue and white wire for connecting to a button in the car to activate the remote start i did not connect that to anything. Thanks for all your guys help so far.

Ryan

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

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

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.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

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?

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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?  

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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