2002 Trailblazer Electrical Issue No Start No Crank

[TheHungriGerman]

Ok so I need help and I'm lost. Early this week I wanted to add a bigger mono amp and another 4 channel amp and I've done this numerous times. Do went to test it out no start warning lights come on. Turn key over dash lights go off an nothing. Ok I replaced ignition switch still nothing. So I pulled fuses checked starter relay and reset computer nothing. So I need HELPPPPP lol please. As of now when I put the key in the truck my windows radio and locks won't work plus it's a no crank no start. The blower motor comes on as do headlights interior lights and fuel pump The warning lights that come on are abs brake battery and service engine light.

[mason10198]

Alot of those things you said are working don't require much power. You might have killed your battery. I remember when I put my amp in, I had almost the same exact syptoms. I blew a cell in the battery so there was just enough voltage to make some lowend power things work but the starter motor wouldn't make even the slightest noise.

Sent from Tapatalk

[v7guy]

Mason is correct, those symptoms seem awfully similar to when the battery in my trailblazer shit the bed.

[Rickalicka18]

I second mason. I had to replace my alternator and battery. I recommend you either get a nice deep cycle agm battery or a secondary battery to power just the amps. My set up is a 4 channel putting out 75w to each channel and my mono amp (which is currently dying) rated for 500w and I have zero problems with flickering and charging...

[TheHungriGerman]

Tried that. I have a 800cca deep cycle battery and a 220 amp ho alternator replaced ignition switch and starter relay

[Rickalicka18]

How many watts rms does your mono amp and 4-channel amp put out?

[TheHungriGerman]

2000 mono and 500 4 channel

[TheHungriGerman]

As of now I disconnected the amps

[Rickalicka18]

when I was putting together my system crutchfield recommended that I get a battery with atleast 1000 cold cranking amps...

[TheHungriGerman]

I'm not even sure if you make your battery die hard. At that point if you're running that much why you're better off adding a high output alternator in a second battery. Turns out on my friend was securing the capacitor down underneath the passenger side seat in the back. He screwed into a wiring harness.

[TheHungriGerman]

Battery that big lol stupid voice tezt

[Rickalicka18]

I have a basic napa battery up front. My whole system runs off my secondary battery. That was just the recommended battery to use if I wanted the one battery upfront. My system isn't very power consuming at all... But yours sounds pretty power hungry if your sub amp puts out 2000 rms and your 4 channel puts out 100rms per channel... I think if you replaced the capacitor, which really doesn't do a lot for that big a system, with a secondary battery like mine, or really any agm battery will do, you would see a world of difference in how your system performs. Especially at idle. Just my opinion.

[Rickalicka18]

Whoops. 125rms per channel on the 4 channel, not 100.

[TheHungriGerman]

Honestly with The cat and I output alternator. At a 1000 RPM's I'm putting out about 14.2 volts and at idle about 13.5. I'm also planning to do the Big 3 upgrade within the next week or so.

[Rickalicka18]

Don't you want a constant 14.2 volts all the time?

[HawkeyeC25]

Have you checked the Park/Neutral (NSBU) switch on the trans? Does P light up when in Park? Does it change when you are keyed on and shift through the ranges?

[TheHungriGerman]

Thanks we got it fixed. Myneutral safety switch has been giving me issues since I had the tranny rebuilt. But it starts now. I do need to crawl under there and fix the switch eventually though.