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Ccmano · 06-09-2019

An number of possibilities here. What’s interesting is your statement that the voltage was very low after driving but recovered after sitting. I’d start by checking the battery terminals for looseness, take them off and clean them, then retighten. To check the battery health in general do a battery capacity (load) test, any Autozone can do it for free. The 12.6 volts you got afterwards is correct for a static battery doing nothing, that doesn’t mean it can handle a load tho.

If the battery checks out the alternator is the next suspect. Again, given your description you could have an intermittent alternator or voltage regulator. I recently did an alternator for a friend that worked perfectly at startup but quit after about 5 min. To check simply start the car and let it idle and watch the voltage gauge (or better an external voltage gauge). After start up the voltage should go up to about ~13.7 volts, let it run for a while and watch the voltage. If it suddenly drops below 12.6 the alternator has given up.

Of course it may just be the common starter solenoid issue, clutch switch Issue about much has been written. Do a search and you’ll find detailed instructions.
H

06-09-2019	#4
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,852	Re: Old battery = no hot start? An number of possibilities here. What’s interesting is your statement that the voltage was very low after driving but recovered after sitting. I’d start by checking the battery terminals for looseness, take them off and clean them, then retighten. To check the battery health in general do a battery capacity (load) test, any Autozone can do it for free. The 12.6 volts you got afterwards is correct for a static battery doing nothing, that doesn’t mean it can handle a load tho. If the battery checks out the alternator is the next suspect. Again, given your description you could have an intermittent alternator or voltage regulator. I recently did an alternator for a friend that worked perfectly at startup but quit after about 5 min. To check simply start the car and let it idle and watch the voltage gauge (or better an external voltage gauge). After start up the voltage should go up to about ~13.7 volts, let it run for a while and watch the voltage. If it suddenly drops below 12.6 the alternator has given up. Of course it may just be the common starter solenoid issue, clutch switch Issue about much has been written. Do a search and you’ll find detailed instructions. H __________________ 90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold.