power problem
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=18978
Printed Date: July 07, 2025 at 5:14 PM
Topic: power problem
Posted By: cutros10
Subject: power problem
Date Posted: September 17, 2003 at 10:29 PM
2 days ago my main power wire fuse of 40A blew for the first time in 1 year since i got it. i replaced fuse and then after maybe 3 min of working it lost all ump in the sub and then amp turned off. i first thought wire was bad so i got all new 4g wire from battery to amp to ground and amp now works but pulls all power from car to 8-9 volts cuasing car not to work almost. i want to know how i should hook up a second battery and if that will fix this promblem help please i am clueless
Replies:
Posted By: nedgeworth
Date Posted: September 17, 2003 at 10:34 PM
What sort of system you running. I assume it can't be all the powerful if you've only got a 40amp inline fuse. It sounds to me like you need a new battery. You should also look into getting the alternator checked as well cause this could be the source of your problem.
Posted By: cutros10
Date Posted: September 17, 2003 at 10:39 PM
i have a kenwood 1000 watt amp. should i bump up to a 60amp fuse? how would i hook up a second battery? would i just run from main battery 4g to second battery then to amp then grond all out cuase when i do that my amp get hot so so quick but my car stilll drops to 9 volts wen bumping and then sometimes it turns amp off or just bumps like so so little not hard like normal. what do u think will help the most and where can i but a powerful alternator
Posted By: Ketel22
Date Posted: September 17, 2003 at 10:42 PM
have you checked the subs yet? i had a similar problem with my friends system, we replaced everything except the subs spent plenty money then it turned out the subs were just blown. ------------- Quad L Handyman services
Posted By: cutros10
Date Posted: September 17, 2003 at 11:19 PM
well i dont think its the subs cuase if i hook up a charged battery and run the subs they work fine and hit hard i am guess it must be my alternatior or my main car battery if i have a second battery hooked up will my guage in the dash still read 9 volts if alternator is good? HELP {LEASE
Posted By: nedgeworth
Date Posted: September 17, 2003 at 11:21 PM
What is the fuse rating on your amp? And i think ketel has a pretty good point cause one of my mates had a similar problem. Turned out to the battery and his sub. Basically if your system has been running fine for a yr, just think if anything has changed. But you should see if you can test your subs on another amp or in someone elses car.
Posted By: nedgeworth
Date Posted: September 17, 2003 at 11:23 PM
Putting in a second battery would put more of a strain on your alternator as it needs to charge both batteries. So i suggest go get your alternator checked. Also there is more involved in hooking up a second battery you can't just straight connect it too the other!
Posted By: fuseblower
Date Posted: September 18, 2003 at 8:34 AM
Does the voltage drop when the car is idling or while driving. One quick way to check your alternator is to disconnect the ground wire while the car is running. If the car kills the alternator is probably weak. (a car runs using the alternator and battery. The battery can not run the car alone but the alternator can.) If your voltage drops only when your car is idling you need to rebuild or upgrade your alternator to a high-output one. Also, you might want to upgrade your fuse. A 1000 want amp normally draws close to 90 amps.
Posted By: MAXST
Date Posted: September 18, 2003 at 4:28 PM
hit ebay....they have 200amp alts very cheap.
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