Join Date: Feb 2000
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Re: Relay question for CJDAVE
To determine how many relays one oil pressure switch can turn on/off, you need to know how much current can go through the oil pressure switch and how much "sense" current is required to close the contacts on the relays. Most larger relays simply will not close if you don't have enough current coming in on the trigger.
On the Relay topic:
There are numerous types of relays out there, the cheapest are definitely the magnetic latching relays (they come with the KC hilite kits). CJ Dave likes relays but I'm sure is more familar with them that the average joe [img]/wwwthreads_images/icons/wink.gif[/img]. When you are mounting these relays, keep mounting location in mind. Most of these cheaper magnetic relays are very susceptible to water damage, even high humidity can shorten the life of them. Those that are hermetically sealed are good for under the hood mounting. Also, the contacts on these get corroded with carbon deposits and need to ocassionally be cleaned, which can usually be done with a pencil eraser and a little sand paper. My brother's KC's were flickering on and off sometimes and eventually didn't come on. I took the relay apart and cleaned the contacts up, works like new. Eventually, it will have to be replaced. But I will put a better relay in.
In summary, keep in mind the type of relay you want and where you are going to mount it ( and the obvious power requirements for the load that will be placed on it!). I use a lot of relays at NASA on various project and you definitely get what you pay for, have seen them for .99 cents to $2,000 for one relay! (hermetic seal with mercury switching)
[img]/wwwthreads_images/icons/cool.gif[/img] Big Ed
<font color=red>'88 YJ, 4" susp,3" body,33's,283 Chevy V8,TH350,4.11's,D30,D35c</font color=red>