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Why anti grind/starter cut relays drain batteries.


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howie ll 
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Posted: April 09, 2011 at 5:00 PM / IP Logged  
Why people are getting flat batteries;
I've seen this posted twice recently and people don't appear to be following the alarm manufacturer's instructions.
An external anti-grind/starter relay should be wired as follows:-
85 Only use the "ground when armed (GWA)" from the alarm.
86 Ignition 1 only.
87a Key side of starter
30 Starter side of cut wire and starter output from R/S.
Diode 1N4004 across 85 and 86 with the band towards 86.
If you join a constant 12V+ to 86 that relay will be on all the time and you will have a flat battery within a day.
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
syl20rochon 
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Location: Ontario, Canada
Posted: April 11, 2011 at 9:05 PM / IP Logged  
Nice Howie, good tip.
Sylvain Rochon
MECP security specialist
Tech support for remote starters
23 Years of experience counts
I'm here to help.
sandoggg 
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Location: California, United States
Posted: May 05, 2011 at 9:37 AM / IP Logged  

I installed a Compustar CM3000 on a manual 2001 Chrysler Sebring Coupe.  I am having the same problem.  For a while it was doing fine but if I don't use my car for a day it drains the battery flat.  I even bought a new battery thinking it wouldn't hold charge.

I followed the instruction for Conn#1 Pin 6 (yellow) hookup.  This is a pre-wired starter kill relay but I just remembered.  I removed the relay while installing the RS and plug it back when I was done.  Was there a possibility I plugged it in wrong?  Does the relay plug in only one way or could it be plugged in the wrong way?   

I also am looking at a Firstech Inst on the same alarm but their hookup instruction is different:

30-key side, 87a-starter side, 85-CN1 of RS, 86-red

Pls. help.  I'm just about to yank this "thing" out.  Thanks to all!  

disco77
howie ll 
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Posted: May 05, 2011 at 9:40 AM / IP Logged  
No you can't plug it in the wrong way. 86 Red should be live on ignition and start.
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
sandoggg 
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Joined: February 05, 2011
Location: California, United States
Posted: May 05, 2011 at 10:38 AM / IP Logged  

Would you suggest  I remove the pre-wired harness and hook up using the outline you showed?  Maybe the pre wired harness is wired wrong?  One clarification...what happens if you hookup 87a and 30 the otherway around?  I see both ways on other sites.

By the way, if this is set up is hooked up wrong would the car start?  I also had a problem of intermittent starting.  The car would just turn over but never start...then sometimes it would.. 

Thanks

disco77
howie ll 
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Posted: May 05, 2011 at 12:44 PM / IP Logged  
My previous post is the only right way to do this. Just make sure 86 is ignition and start live only. The intermittent start problem is nothing to do with this.Check your by-pass if fitted and the quality of your wiring connections. 87a and 30 can go the other way round but then it's easier to make 87 the starter output from the R/S.
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
toran 
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Joined: August 26, 2005
Location: United States
Posted: August 01, 2011 at 10:19 PM / IP Logged  
"If you join a constant 12V+ to 86 that relay will be on all the time and you will have a flat battery within a day."
Would this also explain a slow drain that kills the battery in a couple of days?
I notice that with alarm off, the following day the battery remains at about 12.1 to 12.2 volts.
With the alarm on, the following day the battery is between 11.7 to 11.9 volts.
T.I.A.
scourage 
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Joined: August 15, 2011
Location: Colorado, United States
Posted: August 15, 2011 at 10:54 PM / IP Logged  

I'm new here, I came here with a different question I had about the starter cutout relay but came accross this thread.  I just purchased a Crime Guard Alarm/Remote Start system, so I decided to look at the included Starter cutout relay which includes the diode, but the band is towards 85, not 86.  Did they wire this incorrectly?

howie ll 
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Posted: August 16, 2011 at 2:44 AM / IP Logged  
It doesn't matter which way the coil is wired, the international convention states that 85 is the NEG and 86 the POS of the coil and the band faces the POS. If they've made 85 the POS (ignition), fine but that asks questions about the quality of the whole.
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
oldspark 
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Joined: November 03, 2008
Location: Australia
Posted: August 16, 2011 at 4:13 AM / IP Logged  
Howie x2.
Be aware that +12V goes to the band-end terminal, ie, #85, NOT #86.
I know that is what Howie wrote, but just in case it isn't clear. (That's my Sir i am an idiot helpful clarification (aka: due-diligence) for the day.)
And does Howie x2 mean Howie IIII? Mind you, I thought he would have been promoted from Platinum by now.... (ie - Howie's "fire" warning from a few days ago).
PS - although I hate diode-protected relays - and by that I mean that I prefer to add my own EXTERNAL diode - I consider it UNFORGIVABLE that anyone market a diode-protected relay that breaches the Kathode = band = #86 convention. (Unless PERHAPS extremely highlighted with warnings, or a totally pre-wired item etc.)
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