yeah. I actually got it to correct itself by putting in a new relay

 

great fix.
consider putting in a capacitor. it will make up for voltage deficit when the sub draws more power the battery and alternator can supply.

 

well come to find out it came back and starting running my voltage 15.8-16 on 1500 rpm

 

^ Not only will it help improve the battery and alternator life, it will also make the bass tighter. A capacitor should have a much lower internal resistance (aka Equivalent Series Resistance, ESR) than a car battery which means it can provide more current more quickly than a battery, especially when the capacitor is mounted near the amplifier.

-Rod

 

Are you measuring the charging system voltage using a multimeter at the battery itself, or just going off of the battery gauge in the instrument cluster? What's the battery voltage measure without the truck running, and what does it drop to when the starter is engaged? Maybe the instrument cluster gauge is not accurate or maybe you have a weak battery and the charging system is attempting to compensate for the weak battery by upping the alternator output.

-Rod

 

+1 for getting the battery tested. it should be checked first for any starting/charging problems.

 

without the truck running, the battery is showing 12.4 volts, when started up and running, it’ll jump to 15.6 almost 16 volts but back down. But should be around 14 give or take

 

Is that measured using a multimeter at the battery? While the starter is engaged, what is the battery voltage at the battery terminals?

-Rod

 

that’s with a multimeter at terminals with our starter engaged battery is reading 12.8 but while running this morning it was reading 17. I’m going to test it while trying to start it. I’ll keep you updated on results
Update: tested the terminals while the wife engaged my starter, it was showing 11.8 and then while it ran, it was showing 14.8 and fluctuating in the 14s as if it started working.

 

if you are trying to load test the battery...disable the fuel pump and crank it over till it stalls. then crank it over for 7seconds..if the battery stays above 9.6 volts during the load at the 7second mark; its good.
a battery with a bad cell can cause the charging system to overcharge.