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Bosch regulator wiring

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bbhf
Posts: 26
Joined: Fri Oct 24, 2008 8:05 pm
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Bosch regulator wiring

#1

Post by bbhf » Sat Jul 18, 2009 2:10 pm

Can anyone please tell me how to wire a 12v Bosch reg to a stock pan ignition switch???? i am pretty sure how to but have just enough doubt to seek advice: the reg is mounted off the generator end using an after market bracket: i have a wiring harness from hummer emporium: i am trying to hold true to the stock wiring paths as close as i can: bbhf



steve_wood
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Location: Belleville, Ontario, Canada

Re: Bosch regulator wiring

#2

Post by steve_wood » Sat Jul 18, 2009 2:48 pm

Does it have three terminals labled F,G and B?

If so, based on the Clymer wiring diagram:

Bosch terminal F goes to the F terminal on the generator via a green wire.

Terminal G goes to the A terminal on the generator via a red wire.

Terminal B goes to terminal box terminal 39. From there it goes to the ignition switch. It also connects to the battery via another red wire.

Don't forget to ground the regulator well!


Hope this helps.

bbhf
Posts: 26
Joined: Fri Oct 24, 2008 8:05 pm
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Re: Bosch regulator wiring

#3

Post by bbhf » Sat Jul 18, 2009 2:57 pm

Steve: thanks: i have the one for a sportster: has D+, DF, 61, B+ and a ground: can i run all the wires up the front frame leg to the switch and a terminal on the dash? thanks bbhf

awander
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Re: Bosch regulator wiring

#4

Post by awander » Sat Jul 18, 2009 3:11 pm

D+ to A on the generator

DF to F on the Generator

(it might help to know that D means Dynamo or generator)

B+ to the battery & lights

61 not used.

bbhf
Posts: 26
Joined: Fri Oct 24, 2008 8:05 pm
Bikes: 1952 panhead

Re: Bosch regulator wiring

#5

Post by bbhf » Sat Jul 18, 2009 3:26 pm

Andy: thanks: can i run the B+ to switch post #1 or 5? the later duo-glide diagrams show a wire off the armature to the gen light: can this be used for my 52? bbhf

awander
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Re: Bosch regulator wiring

#6

Post by awander » Sat Jul 18, 2009 8:31 pm

Yeah, I'd run from B+ to terminal 1 to supply voltage to your switch.

The gen light will need to be wired up between A on the generator and terminal 5 on the switch. Terminal 5 is switched hot, and will be at battery voltage when the ignition is on. The A terminal will be a voltage very close to battery voltage when it is charging, so there will be almost no voltage across the bulb, and it won't light. If the Generator stops charging, then the A voltage will be considerably lower than the battery voltage, which will light the light. The lightwill get brighter as teh geneartor voltage gets lower.

bbhf
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Joined: Fri Oct 24, 2008 8:05 pm
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Re: Bosch regulator wiring

#7

Post by bbhf » Sun Jul 19, 2009 12:53 pm

Thanks: this is the only confusing part as it is different from the diagram: bbhf

bbhf
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Re: Bosch regulator wiring

#8

Post by bbhf » Tue Jul 21, 2009 11:47 pm

Thought i would post a few pics of my wiring progress: i am not done yet: i hooked up a battery and did not fry anything: had head and tail lites and dash lites: what size fuse should i use: i am 12v and have the small battery: i used a 30amp fuse to test:thanks for all the help: bbhf
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willy
Posts: 7
Joined: Fri Dec 20, 2013 12:53 pm
Bikes: U-model Flathead
Location: NSW C.C. AUSTRALIA

Re: Bosch regulator wiring

#9

Post by willy » Sun Feb 21, 2016 4:27 am

hi, can anyone help . Need to connect a 12v bosch regulator to my Flathead.
Thanks in advance, cheers Willy

willy
Posts: 7
Joined: Fri Dec 20, 2013 12:53 pm
Bikes: U-model Flathead
Location: NSW C.C. AUSTRALIA

Re: Bosch regulator wiring

#10

Post by willy » Thu Apr 07, 2016 8:22 am

hi there, can anyone help me with some info and photos , how to connect a bosch regulator to a U flathead?
Thanks Willy.

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