Ok so i need a continuous aproximately 15v source in the trunk... any reccomendations?
01-03-2004, 10:04 PM
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15v is A LOT
you prob aren't gonna get 15v with your stock electricals...
i have a 2.8 with a 120a alternator and an optima yellow-top...according to my voltmeter i peak at around 15.5v (usually in the morning when i first turn the car on and aren't running much of the electricals) but on average i'm around 14.5-15v...
so, thus, your answer is a two part one:
first, rid yourself of the stock battery (if you haven't done so). if you have a 1.8T with (IRRC) the 90am alternator, consider going to the 120a (if you have something that warrants a full 15v--whatever that unnamed item may be--you prob need an upgraded alternator)
pt II:
you are going to need a fairly thick, good quality, high-strand wire to transport that much power THAT LONG A DISTANCE (from yer battery to yer trunk...roughhly 5 meters) so you will undoubtedly need to run circa 6awg wire from the battery terminal to the trunk and find yourself a good ground (they are rare in our trunks...try the u-bolt that holds the seats and seatbelts in place...there's a nice chunk of metal there....if not, try sanding the large sheet metal area below the rear deck)
of course, i assume you are running an accesory which actually requires 15v (you probably don't).
btw: constant power== ALWAYS on (even if the car is off)
accesory (switched) power == power that comes on when the ACC switch (ie when you turn the key) comes on).
and as always, fuses are a must. be careful when you are working with dc voltage, always disconnect one terminal of the battery when working with dc voltage (either the positive or negative but not necessarily both), and the last thing you should do is reconnect that terminal after everything else is done.
oh yeah...and good ol' mecp standby: "always use the right tool"
i have a 2.8 with a 120a alternator and an optima yellow-top...according to my voltmeter i peak at around 15.5v (usually in the morning when i first turn the car on and aren't running much of the electricals) but on average i'm around 14.5-15v...
so, thus, your answer is a two part one:
first, rid yourself of the stock battery (if you haven't done so). if you have a 1.8T with (IRRC) the 90am alternator, consider going to the 120a (if you have something that warrants a full 15v--whatever that unnamed item may be--you prob need an upgraded alternator)
pt II:
you are going to need a fairly thick, good quality, high-strand wire to transport that much power THAT LONG A DISTANCE (from yer battery to yer trunk...roughhly 5 meters) so you will undoubtedly need to run circa 6awg wire from the battery terminal to the trunk and find yourself a good ground (they are rare in our trunks...try the u-bolt that holds the seats and seatbelts in place...there's a nice chunk of metal there....if not, try sanding the large sheet metal area below the rear deck)
of course, i assume you are running an accesory which actually requires 15v (you probably don't).
btw: constant power== ALWAYS on (even if the car is off)
accesory (switched) power == power that comes on when the ACC switch (ie when you turn the key) comes on).
and as always, fuses are a must. be careful when you are working with dc voltage, always disconnect one terminal of the battery when working with dc voltage (either the positive or negative but not necessarily both), and the last thing you should do is reconnect that terminal after everything else is done.
oh yeah...and good ol' mecp standby: "always use the right tool"
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