Why anti grind/starter cut relays drain batteries.

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SKratch

Member - Posts: 12

Joined: November 05, 2004

Location: United States

Posted: November 08, 2013 at 9:09 PM / IP Logged

Wouldn't wiring the +(86) trigger to ignition alleviate all of this..?

I mean, that's the way I learned it.

Why would you need the relay active unless the ignition is turned on (in attempted theft) anyway?

That way the starter is only interrupted during the violation.

Diodes, polarity bias, etc wont matter as much in that case, right?

*shrug

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mikedelta

Member - Posts: 5

Joined: December 29, 2013

Location: Pennsylvania, United States

Posted: December 30, 2013 at 3:24 PM / IP Logged

This may be a stupid question, but does it matter which way you hook up 87a & 30?

According to the instruction manual for my Compustar CM5000 it is telling me that 87a goes to the starter side, and 30 goes to the key side.

Should I switch these wires to prevent battery drain?

86 is wired to the RS Ign, and 85 is to a GWA

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oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: December 30, 2013 at 10:51 PM / IP Logged

No.

Interchanging 30 & 87 or 30 & 87a never matter if only 2 contacts are used (ie, in plain "on-off" mode; NOT changeover mode that uses not all 3 of 30, 87 & 87a).

In fact when I use an SPDT changeover relay as a mere SPST, I will often connect the input (+12V) to 87 or 87a to avoid exposed unused "hot" terminals.

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mandofever

Member - Posts: 11

Joined: December 09, 2010

Posted: December 31, 2013 at 10:31 AM / IP Logged

Like Mikedelta, I am installing a CM5000 and there is no diode included on the prewired relay or harness. Should i add it to the GWA wire like Howie II mentioned earlier in this thread, band side towards RS unit?

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Why anti grind/starter cut relays drain batteries.

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