posted
Ok, I know this has been asked before, but I need to find out what the deal is before I make a mistake.
I want to have 2 Yellowtops in my car, one to start it, and a second to help juice up my PHD2.
I drew a little diagram to help show what I'm trying to say... If the 2 batteries are exactly the same, could I just connect the one under the hood to the one in my trunk? Then, take a wire from the one in the trunk to my amp??
quote:Originally posted by Blunt: Do I want to connect the negative terminal on the amp to the frame of the car, or to the negative terminal on the second battery?
It shouldn't matter, but personally I'd connect it to the battery. Every little helps.
Colin
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posted
Ok think about wiring up a cap... Would you run a negative wire back from the front battery? No you would ground the cap seperately...
When upgrading the wire from the alt I was advised nothing heavier than 4 gauge cause the 2 gauge will let too much current go through getting the wire too hot too fast or some bull? Who knows? I'm no professional but I try... And ask questions and help give answers as best to my ability...
-------------------- 2 POWER HX2 12's and 2 powerbd1500.1's Proud Member of TEAM B.L.O ME (Team Bass Lovers Of Maine)
quote:Originally posted by BassFromTheKrypt: Ok think about wiring up a cap... Would you run a negative wire back from the front battery? No you would ground the cap seperately...
When you ground it separately it's still coming from the frame of the car, so it's coming from the starter battery just indirectly. Everything grounded goes to the same frame right?
Good point about the alternator to battery wire, is there a size limit for a stock 80A alt?
quote:Originally posted by BassFromTheKrypt: When upgrading the wire from the alt I was advised nothing heavier than 4 gauge cause the 2 gauge will let too much current go through getting the wire too hot too fast or some bull...
just like with power wire for an amp....bigger is better if u have the 4 gauge and have a whole sh** load of current.....it will heat up cause of the size.....if u take the same amount of current and run it through the 2 gauge it will not heat up because of the size of wire basicly if the wire is too small it acts like a resistor and restricts current flow thus causing it to heat up good example of this is tryin to feed a D2 with 10 gauge wire over 10 feet long....that wire is gonna be HOT
-------------------- Who needs a team? You kick azz in the lanes for yourself, nobody else. Posts: 124 | From: USA | Registered: Aug 2001
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posted
An isolator will also keep the amps from discharging both batteries. The isolator will allow the alternator to charge both batteries but only allow the amp or amps to draw current from one battery.
Posts: 101 | From: Paris, TX USA | Registered: May 2001
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posted
yes blunt you are ok. you dont need an isolator. just dont play it with the engine off for very long. and if you only have the stock-factory alternator in the vehicle there is no reason to upgrade the alternator to battery wire either, that wire is already sufficient....
Posts: 1853 | From: freezing in FAIRBANKS ALASKA | Registered: Aug 2000
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quote:Originally posted by timmi: yes blunt you are ok. you dont need an isolator. just dont play it with the engine off for very long. and if you only have the stock-factory alternator in the vehicle there is no reason to upgrade the alternator to battery wire either, that wire is already sufficient....
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