Q:I have 5mm LEDs that Im using to make automotive tail lights with and I need to know what I use for surge protection.

Figure out the current draw, and use a slow-blo fuse in series. Why do you need surge protection in an automobile ?

Q:I put an aftermarket radio in a 2002 pt cruiser and at first all was good until I noticed a fuzzy ness to the radio stations so I messed with the antenna cord and all of a sudden the radio wouldnt power on at all. The fuses seem to be all good. All lights on dashboard work. It also says no fuse on the dash. Everything works but the radio and I think the power locks.

Check fuse #18 (20amp, yellow) in the Power Distribution Center box under the hood. This fuse has a plastic pull-tab on it. It's used to control Ignition-Off Draw IOD. The fuse is pushed in when you take delivery of the vehicle. The owners' manual explains that it's used to keep the battery from draining during extended storage. If it's blown, you will need to determine what caused it to blow. This 20a fuse won't blow unless you've added a load to the circuit or there is a component failure. It doesn't take much to blow the fuse, the addition of a stereo or alarm, or even the power window modification, if you wired it into that circuit. If you haven't added an additional load, and the vehicle self-tests check out OK, dealer service will need to diagnose the problem.Also check the fuses in the fuse box by the driver's left knee inside the car and a 40 amp fuse up in the power distribution box under the hood.

Q:after a ride i noticed my neutral light, tachometer, blinker lights and gauge, and brake light were not working anymore. im not good at electrical but i took off my gas tank and seat to follw the wires and i didnt see anything that looked like it wasnt getting contact, and i also checked my fuses. any thoughts?

Now that you're satisfied with your fuses and connections,check your relays, and wiring between connections for any place where the may get pinched. Also check mounting of all the affected devices for a good, clean, rust free and solid mounting to ensure good grounding of those devices. It sounds like the failure of any one of these components affects them all.

Q:I have a circuit keep blowing fuse(0.4A) with slightly lower rating of my transformer (0.5A) without any load, so i think is the issue of in-rush current. ***Note : my transformer is toroidal, saw a lot of website saying they inhibit higher inrush voltage (80times. scary)***Will the in-rush current will do any harm or any changes to other things(component) ?If so, what type or rating of fuse should i get ? (best if easily get, market available)ORis there any way to de-energize the transformer when it is turned off/before switch on, or any circuit to use for protect over-current/voltage during inrush ONLY ***Note that i want to make my circuit fuse safe from short circuit and blow the fuse if it is really short circuit***

Assuming the transformer is well designed and you are operating it within it's rating, no problem. I'd change the fuse to 3/4 amps slo-blow. .

Q:I have a Polk Audio MOMO C400.4 that im planning to use to power my MOMO 6x5 components and MOMO 6x9's @ 75w RMS x 4. I also have a Kenwood KAC-7202 that i plan on running bridged which will pull 460w RMS @ 4 ohms. What size fuze will I need for 4 gauge wire? I have a 4AWG wire with a Rockford Fosgate distribution block that splits from 4AWG to 8AWG with AGU fuses on it, unknown size Would I still need a inline fuse to the battery?

always place an in line fuse the the amp wiring ; as close to the battery as possible . consider this if the amp wire gets pinched or drilled though then a short to ground exists . you want the in line fuse at the battery to blow so the wire does not heat up and possibly burn your car down. Add the total current requirements and use that size fuse and appropriate holder; in your case 100 A . Ps it is extremely important to have an in line fuse at or very near the battery.

Q:Electromotive forceconductorsinternal resistancewhat is fuse and its function?

the SI unit of conductance is more commonly the siemens, but mho is also correct!

Q:I made one of those DIY laptop coolers and forgot to insulate the two most important wires (which were touching causing short circuit) Plugged it into my laptop which is rendering and suddenly everything just turns off. Is there a fuse or a component I can replace? Tried everything, took out the hard drive. If it is unrevivable what parts will still work?Laptop: asus pro50seriesCPU: intel core 2 duo t5750Hard drive: seagate 250gbRam: 2gbAny help appreciated. Really urgent. What parts do I need to change?

Sorry, there is very little good news. You fried the motherboard with that short circuit, and replacing that will probably cost you the same or more than buying a new laptop. In the worst case scenario, it is quite possible that your CPU and RAM got cooked as well. The only good news is that your hard drive may still be okay.

Q:dose anybody know how to fix the( interior light,power lock ,sunroof ,trunk opener button and radio, which are not working, and they were stoped working at the same time, and i am trying to enter the code for the radio, but one of numbers is zero, and i dont see that on my radio all . please give me your advices if you have any experience about this . thanks

sounds as it those components run of the same fuse check fuses and i bet you will find a bad fuse if so replace the fuse with the same size it it blows again then you have a confirmed there is a short somewheres at which point i recommend taking it to a repair shop to get checked out as for the radio call a VW dealer they probably will be more than willing to tell you how to go about this.

Q:have replaced alternator, speed control censer, electric fuel pump. When fuses are replaced car starts , but dies when put in reverse. and blows another relay fuse.

You have a short somewhere either in your starter or that speed sensor you replaced. I would check all wiring if no short i would be looking at the ECU.

Q:I have a 2004 Dodge, Durango. It has the stock 6 disc stereo, DVD, Sirrus combo. One of the kids left the light on one night and we had to jump-start the car. Since then the CD player will not work. Everything else works just fine. It is like the CD player doesn't exist. Has anyone else had this happen? Does anyone know how to fix it? I know i could take it to the dealer and they could probably fix it for a marginal fee. I was trying to avoid that route if I could. I am mechanically inclined so if it can be fixed I could probably do it. If it is something that is actually broken, I guess I am SOL.

There are 3 greater subject concerns to contemplate and a couple of conceivable concepts i can think of of. a million. it could be well worth at the same time as checking if the amp is in working order. in the experience that your battery remains being drained on a low point of music then attempt working this amp in yet another automobile. it must be the amp at fault! 2. it must be the tip of the battery existence. I as quickly as had a collection up and the battery have been given drained. I replaced the battery and by no ability had a situation lower back. 3. there's a short someplace else interior the vehicle, in specific situations wires can come aside or make touch with yet another floor to empty. conceivable concepts if the amp isn't at fault: a million. Uprate the battery and alternator in case you often crank. you may want a deep cycle battery including an Optima yellow authentic. 2. the great 3: This includes 3 wires. a) 8awg minimum floor from battery to physique (bare metallic) b) 8awg minimum floor from alternator to physique c) 8awg minimum from alternator beneficial to beneficial on battery See how that is going!