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Guest Message by DevFuse

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fuel pump wiring diagram for 79 Brat?

fuel pump wiring BRAT

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3 replies to this topic

#1 JRLeone



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Posted 07 November 2017 - 10:10 PM

My fiance has a '79 Brat that was left to her, and it's having a fueling issue. That is, it was running fine then sat for several years. I put a new battery in it and nothing. If I hot wire the fuel pump it comes on. All I have been able to find is something stating that the alternator sends signal to the voltage regulator which then tells the pump to kick on. I cannot find an actual wiring diagram. It had a new alternator and regulator just before storage; it has another new regulator and the alternator was tested as being good. Tested twice, actually. Nobody can tell me if there is a relay or something, and as I said, I cannot find a wiring diagram anywhere. Does anybody out there have one? Or have any ideas? It would be most appreciated as she is most vocal about this being running ASAP. I should also note that I have power at the fuse.

Thank you!

#2 naru


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Posted 09 November 2017 - 11:46 AM

There is no relay.(other than the one internal to the reg.)

Pump and choke are powered off the "H" terminal of the voltage regulator w/alt. spinning.

If you have power at the choke,you should have it at the pump.


Reg." A" terminal should be always powered.

F terminal should be powered w/ignition on.

E should be grounded


The original electromechanical regulators are subject to corrosion of the contact points and sticking armatures.

Current replacements are fully electronic.

#3 JRLeone



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Posted 09 November 2017 - 06:10 PM

Thank you for the assist; the regulator is new so it is fully electronic. I will go through and check all the grounds I can find, I didn't see any letters for the terminals on the plug of the regulator though but I will break out the test light yet once more! At least now I have somewhere to start, and I know what to look for!

#4 skinny664521903


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Posted 05 December 2017 - 03:44 AM

Howdy I am having similarish issues. How do I know which wires are the a,h,f,and e terminals? Also you can find the wiring diagrams  here. They are a tad bit different then my haynes manual and im not sure whats correct.

Also tagged with one or more of these keywords: fuel pump, wiring, BRAT

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