Our Community is 705,000 Strong. Join Us.


What size fuse to use for a 4-port, DC Adapter?


LieutenantCracker
08-09-2009, 01:02 PM
A Friend o' mine INSTALLED (hard-wired) a "Lenmar DC Adapter, 4 PORT" Model #: SPP04, (device w/ 4 - cigarette lighter-style, female plug-ins). Until recent problems w/ the device, I didn't know that it originally had a male plug-in connector that was meant to be plugged-in to the car's factory installed cigarette lighter as the device's power input-- not intended to be hard-wired into the vehicle's 12v DC system, which my friend did after clipping / disconnecting the male plug. Now, I'm thinking the device's original male plug-in connector must've had a fuse in it, that my friend failed to replace, as an in-line fuse. QUESTION IS (after I replace the fried on/off switch [also added/modified]): What rating fuse should I wire in-line?
The housing only says "3, DC 12V, 1amp Ports; and 1, DC 12V Cigarette Lighter Port". I'm presuming a 5amp fuse would be appropriate (3, 1amp ports = 3amps + 1, cig port [1amp???] TOTAL = 4amps + 1 MORE amp for leeway /pwr fluctuatoin = 5amp fuse[???)-- is that right?
Thanks!
________
Jailbroken (http://jailbroken.org/)

curtis73
08-09-2009, 01:25 PM
That sounds about right. Typically cigarrette lighter plugs have variable ratings. The plug on my car is 5A, but the plug in my newer F150 is 15A. I guess they assume truck drivers will be using more accessories which makes sense.

Your weakest link will be your limiting factor, and it looks like those plugs are only designed for 1A each. Otherwise, your wire gauge would be the limiting factor.

LieutenantCracker
08-09-2009, 04:42 PM
That sounds about right. Typically cigarrette lighter plugs have variable ratings. The plug on my car is 5A, but the plug in my newer F150 is 15A. I guess they assume truck drivers will be using more accessories which makes sense.

Your weakest link will be your limiting factor, and it looks like those plugs are only designed for 1A each. Otherwise, your wire gauge would be the limiting factor.


Thanks!-- Good info. . . . . Helps to jog the ol' brain, if nothin' else! In my abscent mindedness (out of practice AND a novice; at that!) I'd all but forgotten, for a sec, that wire gague is a key factor / variable in how much load a socket, connector, etc... can safely draw [DUH! ==> on MY part!] :smile:
So, correct me if I'm wrong but, if memory serves, I should be able to safely run 25 amps through a "dedicated" 14ga wire (from + battery post or pwr distribution box/starter nut), that I run through the firewall, to a device / power distribution block, etc..., as long as all the (+) power goes through a 30 amp, in-line fuse (connected-in, as close to the batt as feasable)... Right? (?)

-=1999 Mercury Grand Marquis (Crown Vic' -/+), 4.6L, V8=-
________
YOUPORN (http://www.fucktube.com/)

Add your comment to this topic!