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bosche mah 112 c1 relay


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refderek 
Member - Posts: 2
Member spacespace
Joined: December 07, 2014
Location: Louisiana, United States
Posted: December 07, 2014 at 1:33 PM / IP Logged  
Having trouble installing this relay:
86 12 volt constant
85 Ground
30 12 volt ignition switched
87   To power device - electric cooling fan
I have 2 of these to power 2 electric cooling fans and am getting battery drain in about 24-36 hours?
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: December 07, 2014 at 2:52 PM / IP Logged  
Hi,
With term 86 having battery and term 85 having ground, the coils are energized all the time. This is your current draw. Swap the leads at 86 and 30. The relays will only operate when the ignition is on.
Mark
refderek 
Member - Posts: 2
Member spacespace
Joined: December 07, 2014
Location: Louisiana, United States
Posted: December 07, 2014 at 5:38 PM / IP Logged  
Thanks Mark. I'm still getting battery drain connected that way also Should 85 be 12 volt constant and 86 be ground?
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: December 07, 2014 at 6:22 PM / IP Logged  
https://www.the12volt.com/installbay/forum_posts.asp?tid=131820&tpn=1
Read that post. If term 86 is battery power, term 85 must be a switched ground. If term 85 is a ground (non switched) the coil will be constantly energized.
howie ll 
Pot Metal - Posts: 16,466
Pot Metal spacespace
Joined: January 09, 2007
Location: United Kingdom
Posted: December 08, 2014 at 12:57 AM / IP Logged  
All auto manufacturers follow ISO coil convention, 85 is coil ground, 86 coil POS otherwise follow Ween's post
Swap 86 and 30.

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