---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Sat 09/28/13: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:43 AM - Fuse blows .... (goldpilot@aol.com) 2. 08:51 AM - Re: Fuse for strobes () ________________________________ Message 1 _____________________________________ Time: 08:43:15 AM PST US From: "goldpilot@aol.com" Subject: TeamGrumman-List: Fuse blows .... Use a so-blo fuse. Quick acting fuses will open with any slight over current surge. David ________________________________ Message 2 _____________________________________ Time: 08:51:58 AM PST US From: Subject: TeamGrumman-List: Re: Fuse for strobes >A few months ago I installed Aeroflash strobes on a 79 Cheetah. Worked fine on the ground. Worked fined in flight right up >until landing. When the fuel pump was turned on, the fuse blew. Duplicated the problem twice. Installed a 6amp fuse. Same >thing. Installed an 8amp fuse. Same thing. Installed a 10amp and it holds. >Possible scenario is that the fuel pump draws too much current. New strobes would not be drawing too much current? Would >they? >Last week I installed the same strobe kit on a 77 Tiger. Same exact fuse failures. >The only real solution is to move the strobes to their own fuse/circuit breaker. >Unless someone out there knows something I don't. >Gary >Sent from my iPad Sure sounds like they have changed the strobe power requirements. How unlikely is it that 2 planes would have the same high current fuel pump problem? Given that the fuel pump is an interrupter design, it only draws current for an instant when the points make contact and the electromagnet is energized. The rest of the time the points are open and the spring is pulling the plunger to push the fuel. And as the pumps age, the points burn and pit, eventually drawing LESS AND LESS current, due to the resistance of the contact points rising. I'd try the strobe power supplies individually with a small ammeter to get a reading on the actual current draw. Alternatively, see if you can get a "slo-blo" fuse, since the pump requires only pulses of electricity. Could also change to a CB, which takes longer to trip than the fuse blowing. But I'm leaning toward strobe power supply (just one drawing too much is all it takes) causing the problem. --Bob Steward Birmingham, AL ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message teamgrumman-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/TeamGrumman-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/teamgrumman-list Browse Digests http://www.matronics.com/digest/teamgrumman-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.