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Old 01-17-2012, 12:28 AM   #1
2madre
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Default Wiring Bosch 5 pin relay diagram

So many different ways for wiring this relay. 85,86,87,87a,30.wiring fuel pumps from a moroso switch panel with a built in 20 amp fuse.
One relay for each pump, then one for fan and another for nitrous.
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Old 01-17-2012, 01:04 AM   #2
rod cole
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Default Re: Wiring Bosch 5 pin relay diagram

it is on the relay itself. From memory the controled wires are 30 and 87 and 87a depending if you want it pulled on or off. 30 going to the batt with the larger wires the other going to the pump fan whatever from 87 or 87a. The other two go to the switch and ground. Meening ground one take the other to the switch usually lighter gauge wire. The pic on relay the thing that looks like a stick with something around it represents the electromagnet in the relay. The other thing represents the 30 wire it toggles between two contacts representing 87 and 87a depending if you want it closed all the time and open when the magnet is applied or vice versa. Hope this helps.
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Old 01-17-2012, 01:38 AM   #3
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Default Re: Wiring Bosch 5 pin relay diagram

87-87a are outputs to pump, fan,or other things, but 87a could be hot when the relay is not on also most bosch relay has a diagram on it. 86 is power to the 87-87a posts . 85 is power to relay coil 30 is ground for relaycoil
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Old 01-17-2012, 02:05 AM   #4
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Default Re: Wiring Bosch 5 pin relay diagram

85 ground,30 battery pos.,86 toggle switch,& 87 to what ever your powering up, 87a not used
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Old 01-17-2012, 03:36 AM   #5
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Default Re: Wiring Bosch 5 pin relay diagram

^^^^^^^^
You are correct on 85 and 30 I guess 5 years away from BMW's has wasted my brain.
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Old 01-17-2012, 06:36 AM   #6
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Default Re: Wiring Bosch 5 pin relay diagram

Quick internet search but I would switch the source to pin 30.

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