1971 Blazer won’t start - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Shane Richardson · 01-20-2018, 02:46 PM

Hio fellow Blazer owners! Ok, I’m stumped. My Blazer won’t start or even turn over...

Details- 1971 Blazer CST. 350. 4x4. Auto.

Battery has been checked 4 times and it registered as good. Alternator has been check as well- it’s good. New starter. New ignition switch.

One day I go out to start it and nothing. No click, no turn over, nothing. Then I hook up my 1960 Wards battery charger and booster and with it plugged in to wall power source and on “boost” mode it would turn over and start instantaneously. After that I checked all the above mentioned parts and they checked out as good. So I replaced starter which I had not done, same result. So I replace ignition switch, same tesultS now it won’t ev n start using the “boost” mode jump.

Wiring? Do I need to trace wires and maybe I find a shirt?
Fuses look good.
A relay perhaps?
Voltage regulator?

I’m stumped and could use some advice!

Thanks, Shane
Posted via Mobile Device

**mrtoni** · 01-20-2018, 04:03 PM

Try wiggling column shifter. Neutral safety?

ls1nova71 · 01-20-2018, 05:32 PM

Yeah, definitely try moving the shifter while cranking and make sure the neutral safety switch isn't messing up, but if that doesn't work, look at your battery cables. Make sure the ends are clean and not corroded and the bolts are tight.

rsavage · 01-20-2018, 06:20 PM

Also clean all your grounds especially the negative battery ground cable. Is the battery being load tested?

**paul mora** · 01-20-2018, 07:43 PM

One of the best and simple ways to tell if your battery has current is to turn on your lights and honk your horn. If they both work you power to the car and it is not your battery and battery terminals are not corroded. Time to look neutral safety switch or ignition or starter,

1967GTO · 01-20-2018, 09:52 PM

Sounds like a battery or connection at the battery to me.

Shane Richardson · 01-21-2018, 12:13 AM

Thanks guys. Wire brushed neg battery term at the block and tightened- was not “loose” but I could move the terminal. Positive cable has a splice with a little cast connector that I am gonna lose by using a new pos cable. Also re-terminating, at the positive terminal, the red wire coming from regulator- there was a questionable splice in that wire as well. Ignition switch and starter are brand new as mentioned. More updates 2mro. Thanks again.
Posted via Mobile Device

01-20-2018, 02:46 PM	#1
Shane Richardson Registered User Join Date: Nov 2014 Location: Phoenix, AZ Posts: 2	1971 Blazer won’t start Hio fellow Blazer owners! Ok, I’m stumped. My Blazer won’t start or even turn over... Details- 1971 Blazer CST. 350. 4x4. Auto. Battery has been checked 4 times and it registered as good. Alternator has been check as well- it’s good. New starter. New ignition switch. One day I go out to start it and nothing. No click, no turn over, nothing. Then I hook up my 1960 Wards battery charger and booster and with it plugged in to wall power source and on “boost” mode it would turn over and start instantaneously. After that I checked all the above mentioned parts and they checked out as good. So I replaced starter which I had not done, same result. So I replace ignition switch, same tesultS now it won’t ev n start using the “boost” mode jump. Wiring? Do I need to trace wires and maybe I find a shirt? Fuses look good. A relay perhaps? Voltage regulator? I’m stumped and could use some advice! Thanks, Shane Posted via Mobile Device

01-20-2018, 04:03 PM	#2
mrtoni Senior Member Join Date: Jan 2009 Location: sparks, nevada Posts: 1,881	Re: 1971 Blazer won’t start Try wiggling column shifter. Neutral safety?

01-20-2018, 05:32 PM	#3
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: 1971 Blazer won’t start Yeah, definitely try moving the shifter while cranking and make sure the neutral safety switch isn't messing up, but if that doesn't work, look at your battery cables. Make sure the ends are clean and not corroded and the bolts are tight. __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html

01-20-2018, 06:20 PM	#4
rsavage Registered User Join Date: Aug 2009 Location: Alden NY Posts: 2,705	Re: 1971 Blazer won’t start Also clean all your grounds especially the negative battery ground cable. Is the battery being load tested? __________________ 1961 C1 Corvette 1959 El Camino 350 TPI, 9" 4 w disc 69 Blazer K5 - sold July '20 2021 Durango RT 5.7

01-20-2018, 07:43 PM	#5
paul mora Senior Member Join Date: Jan 2009 Location: huntington beach california Posts: 976	Re: 1971 Blazer won’t start One of the best and simple ways to tell if your battery has current is to turn on your lights and honk your horn. If they both work you power to the car and it is not your battery and battery terminals are not corroded. Time to look neutral safety switch or ignition or starter, __________________ Pulatoy

01-20-2018, 09:52 PM	#6
1967GTO Registered User Join Date: Nov 2017 Location: Riverside, Utah Posts: 28	Re: 1971 Blazer won’t start Sounds like a battery or connection at the battery to me.

01-21-2018, 12:13 AM	#7
Shane Richardson Registered User Join Date: Nov 2014 Location: Phoenix, AZ Posts: 2	Thanks guys. Wire brushed neg battery term at the block and tightened- was not “loose” but I could move the terminal. Positive cable has a splice with a little cast connector that I am gonna lose by using a new pos cable. Also re-terminating, at the positive terminal, the red wire coming from regulator- there was a questionable splice in that wire as well. Ignition switch and starter are brand new as mentioned. More updates 2mro. Thanks again. Posted via Mobile Device



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