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w8n2bup
Joined: 09 Apr 2008
Posts: 20
Location: Kansas City Area
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 Posted: Tue Jan 01, 2013 6:29 pm Post subject: Need help with diode across battery and starter relays |
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After a lot of Googling, I thoroughly understand the reason for the diode but I am hoping that someone can give me the exact placement of a diode for both the battery and the starter contactors (relays) in my Jabiru 3300. First the battery contactor. I have a large post going to the battery, a small post going to the master switch, and a second large post going to the starter relay and elsewhere. When I put my voltmeter on the battery post, I have my 12 volts. When I put it on the small post, I was surprised to find voltage there, too, with the master off. When I flip the master switch on.,, it mostly goes away on the small post. In any case, the best I can figure is to put the cathode (stripe end) on the large post going to the battery and the anode on the small post. I was thrown a bit by some net comments saying it goes "across" the relay. Other comments showed it going to ground. On top of it all, my firewall kit came with a diode made with the cathode (band end) going to a small ring connector and the anode going to a large ring. Seems backward. Maybe someone accidentally reversed it? Now the starter relay. It has a few extra large spade connectors and posts. When I put my meter on diode setting, there appears to be a diode built into the relay. With no markings on the relay, I can't look it up to know for sure. I guess it wouldn't hurt to add a diode anyway with the cathode pointing to the battery relay and the anode going to the small starter switch wire post? Just hoping someone knows exactly what I have and how to connect the diode or diodes. If easier, please call me evenings at (913) 915-1989. Still W8N2BUP, John
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jlatimer1(at)cox.net
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| Posted: Wed Jan 02, 2013 7:18 am Post subject: Need help with diode across battery and starter relays |
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John,
You might want to join the aeroelectric forum. This is the type of question
that is answered by the gurus on the forum.
Anyway here is a link to photo on aeroelectric.om that shows the starter
contactor and how it is wired.
http://www.aeroelectric.com/Pictures/Contactors/s701-1.jpg
Hope this helps.
Jerry Latimer
CH601HDS
N316JL
200 hours and having the time of my life.
--
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