Hi I am Styles from Generator Guru, and today I am going to show you how to test your capacitor and Alternator On a brushless alternator Electricity Generator. What happens sometimes is you go out, into your shed, get your generator out, it was running fine last time, you start her up and the engine is running fine, but you have no electricity coming out. Now we need to find out what could have gone wrong with the generator. To do this, we need to find the capacitor. On this type of generator, this one is a Stephill, they are all a very similar layout, the capacitor will be in the end part here, or in the housing where the plugs come off. In this case, it is underneath the housing. What I am going to do is remove the housing, I will remove the end as well, just to show you what is going on there. Ok there it is, this is the capacitor here Just to make it easier I am going to remove this so you can see. This is obviously the housing for it. Now in this case, and in most cases the capacitor is round. We know it is a capacitor, not an AVR, because it has 2 connections, or 4 maximum. I am going to take this out You will see there is 2 tab connections on the top. Sometime there are 4, in case someone want to run them in series or in parallel. Now, in this case, it is an 18 micro-farad, or an 18 followed by what looks like a “uf” symbol. Now what we need to do is see what the state of the alternator is. With a brushless alternator there is only actually one test. Without the capacitor attached, pick up these 2 wires. Don’t worry which one is which. What we want to do is get our multi-meter and set it to the “V” with a little squiggly. That means Volts AC. Now what we normally would do, is run the generator up, because we want to see what voltage we can get out of the alternator. I won’t actually do that as it will deafen you. Once we have run her up, what we want to do… actually, when you got the tab connectors you can connect them before you run it up. which is alway quite nice as these go around at 3000 to 3600 rpm so you got to be really careful. Into the tabs like this. Start up the generator. Get the engine going and what we want to know is what the reading it. It shows here. It should be about 5 volts. Give or take 2 volts. If that is the case, you have a nice healthy alternator, then all you need to do is replace the capacitor. If you are not getting that reading then please contact us and we can advise you from there, because we need to find out what is happening in your alternator. In the case of the capacitors you need to be sure you get a GENERATOR capacitor To transcript All it does [the capacitor] is releases a charge into the windings to get them excited so they produce electricity. To transcript They are not too expensive. You want a long life one as well. to transcript So, just to recap. If you are getting about 5 volts AC on your alternator on the 2 tabs you took off the capacitor make sure it is a generator capacitor you are getting about 5 volts then your alternator is in great condition. Obviously, while you got it open try to give it a little clean. Do not use oil, WD40, or anything like that. Do not use water. Just use your fingers, brush off what you can. Don’t get any water into it at all. As electricity and water do not mix. When it comes to capacitors, make sure you get a good brand and one that is self-extinguishing. These will blow for 2 reasons. 1) You have asked to much of the generator so it is blowing it and could save the alternator. 2) If there is a surge in the alternator, which can happen from a little bit of dust. This will blow to protect everything beyond the alternator. Now I know you have circuit breakers.. but this is much more sensitive So, you want one that is self-extinguishing. Because as you can imagine if you get a fire in here with this gas tank on top, it is not a good combination. I have these on my website, which as you can see is GeneratorGuru.com. If you need any advice, pop to the website and drop us an email. We are always happy to help! I’m Styles, from Generator Guru, signing off. See you next time!