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safe to run two relays off of an alarm?


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Sad, little man 
Copper - Posts: 125
Copper spacespace
Joined: January 28, 2005
Posted: December 28, 2007 at 1:34 PM / IP Logged  
Hi, I'm wiring something up in my car that will require the AUX outputs of my alarm to drive two Bosch style relays at the same time. I have to coils wired in parallel. From what I've read, Bosch relays draw around 150mA to run the coil. The alarm's AUX outputs are labeled at 250mA on the wiring label on the alarm module itself (It's a Compustar, BTW.) Would it be pushing it to run two relays off of one output, or should I be ok? Basically, are the ratings on the alarm conservative, or should I not even consider exceeding them at all?
Edit: Just tested with my meter... Both relays together pull around 260mA, and for some reason the reading drops steadily as the relays continue to be energized. Hmmm, 10mA over. I should be able to get away with that, right?...... Right? safe to run two relays off of an alarm? -- posted image.
'96 Mazda Miata
anaxagoras 
Member - Posts: 31
Member spacespace
Joined: December 16, 2007
Location: Connecticut, United States
Posted: December 28, 2007 at 1:39 PM / IP Logged  
I don't know about how the ratings are on the compustar.
But couldn't you just use an extra relay and branch the 2 off of one? Have the compustar activate relay A, then have relay A activate B and C?
Sad, little man 
Copper - Posts: 125
Copper spacespace
Joined: January 28, 2005
Posted: December 28, 2007 at 1:44 PM / IP Logged  
Yes, I could. But, to be honest, this is in a Mazda Miata, so space was already tight when the car was stock, and since then, I've added an obscene amount of electrical acessories. Everything is wired up well, and has been reliable, but the car is turning into a bit of a wiring nightmare. It would just be nice to keep things simple. Right now I'm doing the wiring in order to remote activate my seat heaters. It already required two relays per seat so I'd like it if I didn't have to find a place to stuff any more. As I said, at 10mA over, I doubt anything terrible is going to happen. I'll probably go ahead with it unless someone comes up with a really good reason why I shouldn't.
'96 Mazda Miata
tedmond 
Gold - Posts: 4,610
Gold spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: January 06, 2007
Location: Ontario, Canada
Posted: December 29, 2007 at 12:32 AM / IP Logged  
you should be fine. i remember i used ground when running from a compustar to run 3 differant relays. bypass mod, defrost, heated seats and no problems so far ahah. well its not my car so untill then, no worries

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