For Dave S and anyone else interested... I posted the schematic of the RPM relay in the files section, back in July 2005. It's still there. Now someone with intimate knowledge of how a 555 timer works, will need to decide if it is supposed to prime or not. 7b. Re: RPM relay (was I think my fuel pump...) Posted by: "Dave Swingle" swingle_dmc@xxxxxxxxxxx daveswingle2 Date: Tue May 1, 2007 11:36 am ((PDT)) I was relaying (pardon the pun) what I have heard. I will at some point open up a couple and try to figure out what the circuit does, although I suspect others (Hi Elvis) have done this too. I don't thing just saying "all that other circuitry" does the analysis justice without truly decoding and understanding the cicuit. Dave Delman D² & 6530 (2700 ohms installed!) ************************************** See what's free at http://www.aol.com. [Non-text portions of this message have been removed] To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/