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> weak voltage on 3rd pin ?, relay board
jimkelly
post Jul 5 2009, 12:41 PM
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i am getting weak voltage on this third pin on my relay board - with key tuned in the on position?? i am trying to trouble shoot why my fuel pump is not getting power. jim


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ghuff
post Jul 5 2009, 01:24 PM
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This is certainly not what I expected down here.
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I am considering soaking my relay board and fuse panel in a bucket of white vinegar overnight just because.

Simply cleaning grounds in the engine bay made my 914 run better, looking at the contacts was depressing. The black undercoating was coming off my relay panel and some of the contacts I could see where corroding.

Your feed to that pin is probably crap, or internally the panel feed to that pin is corroded my guess?
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jimkelly
post Jul 5 2009, 02:25 PM
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i am pretty sure i read that some people cover the underside with epoxy. i wish all the how to threads were cataloged some how : (

my damn haynes lists the diagram for the relay board as part 3 - but has no breakdown of the pins for part 3 : (

jim


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type47
post Jul 5 2009, 02:37 PM
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QUOTE(jimkelly @ Jul 5 2009, 01:25 PM) *

my damn haynes lists the diagram for the relay board as part 3 - but has no breakdown of the pins for part 3 : (

jim


you need to look at the relay board diagram on pelican.

http://www.pelicanparts.com/914/parts/Elec...lectric_73E.jpg

I think that has at least color wiring to all the different pins. A color current path schematic is there also.
The Haynes also ID's item #1 as a 12 pin connector when clearly, it's a 14 pin.
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Dave_Darling
post Jul 5 2009, 09:34 PM
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I believe that Haynes has diagrams of the relay board in with the electrical diagrams as well.

--DD
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904svo
post Jul 5 2009, 09:42 PM
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QUOTE(jimkelly @ Jul 5 2009, 10:41 AM) *

i am getting weak voltage on this third pin on my relay board - with key tuned in the on position?? i am trying to trouble shoot why my fuel pump is not getting power. jim


That's pin #5 (tack lead) if you open the points it should read 12 volts. Chances are the 25 amp fuse contacts are dirty this supply power to the fuel pump relay
and the pump.
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anderssj
post Jul 6 2009, 09:24 AM
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Jim,

Here are a couple of relay board "cheat sheets" I made a while back--maybe they will help . . . .

Attached File  914_electric_73_relay_board_14_pin_connector.doc ( 239.5k ) Number of downloads: 142


Attached File  914_electric_73_relay_board_12_pin_connector.doc ( 240k ) Number of downloads: 162


Best,

Steve A-
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jimkelly
post Jul 6 2009, 11:35 AM
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thanks!

i converted them to jpg in case it helps anyone.


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jimkelly
post Jul 6 2009, 11:37 AM
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14 pin
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