bosche mah 112 c1 relay
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=137892
Printed Date: April 27, 2024 at 6:16 PM
Topic: bosche mah 112 c1 relay
Posted By: refderek
Subject: bosche mah 112 c1 relay
Date Posted: December 07, 2014 at 1:33 PM
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?
Replies:
Posted By: Ween
Date Posted: December 07, 2014 at 2:52 PM
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
Posted By: refderek
Date Posted: December 07, 2014 at 5:38 PM
Thanks Mark. I'm still getting battery drain connected that way also Should 85 be 12 volt constant and 86 be ground?
Posted By: Ween
Date Posted: December 07, 2014 at 6:22 PM
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.
Posted By: howie ll
Date Posted: December 08, 2014 at 12:57 AM
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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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.
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