# Diagnose My Car

**URL:** https://forums.speedlife.net/t/diagnose-my-car/129211
**Category:** SON240sx Automotive
**Created:** [October 30, 2009, 11:21pm UTC](https://forums.speedlife.net/t/diagnose-my-car/129211 "2009-10-30T23:21:07Z")
**Posts on this page:** 1
**Showing post:** 11

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### Author: ![240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/240sx/32/5592_2.png) [@240sx](https://forums.speedlife.net/u/240sx)
#### Post date: [October 31, 2009, 10:25pm UTC](https://forums.speedlife.net/t/diagnose-my-car/129211/11 "2009-10-31T22:25:17Z")

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> [@NYSPEED UPGRADE COMMENTS, PROBLEMS AND SUGGESTIONS POST HERE ONLY!!!!](https://forums.speedlife.net/t/nyspeed-upgrade-comments-problems-and-suggestions-post-here-only/24454/92):
>
> not totally correct. when the battery is fully charged you should have 12.6v. Under cranking a 4cyl won’t usually draw more than 100a. get the car started and check what the voltage is at the battery. should be charging anywhere from 13-14v.

yes i would agree, but if the car was running off the battery for a while because of a dead alt, the only thing keeping the car going was the battery which would eventually die, and would do exactly what he is describing.

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