Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

> weak voltage on 3rd pin ?, relay board
jimkelly
post Jul 5 2009, 12:41 PM
Post #1


Delaware USA
****

Group: Members
Posts: 4,969
Joined: 5-August 04
From: Delaware, USA
Member No.: 2,460
Region Association: MidAtlantic Region
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


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
 
 Reply to this topicStart new topic
Replies(1 - 8)
ghuff
post Jul 5 2009, 01:24 PM
Post #2


This is certainly not what I expected down here.
***

Group: Members
Posts: 849
Joined: 21-May 09
From: Bodymore Murderland
Member No.: 10,389
Region Association: MidAtlantic Region
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?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jimkelly
post Jul 5 2009, 02:25 PM
Post #3


Delaware USA
****

Group: Members
Posts: 4,969
Joined: 5-August 04
From: Delaware, USA
Member No.: 2,460
Region Association: MidAtlantic Region
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


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
type47
post Jul 5 2009, 02:37 PM
Post #4


Viermeister
****

Group: Members
Posts: 4,254
Joined: 7-August 03
From: Vienna, VA
Member No.: 994
Region Association: MidAtlantic Region
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.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jul 5 2009, 09:34 PM
Post #5


914 Idiot
***************

Group: Members
Posts: 15,161
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
I believe that Haynes has diagrams of the relay board in with the electrical diagrams as well.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
904svo
post Jul 5 2009, 09:42 PM
Post #6


904SVO
***

Group: Members
Posts: 1,124
Joined: 17-November 05
From: Woodstock,Georgia
Member No.: 5,146
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.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
anderssj
post Jul 6 2009, 09:24 AM
Post #7


Dog is my copilot...
***

Group: Members
Posts: 1,736
Joined: 28-January 03
From: VA
Member No.: 207
Region Association: MidAtlantic Region
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: 149


Attached File  914_electric_73_relay_board_12_pin_connector.doc ( 240k ) Number of downloads: 171


Best,

Steve A-
User is online!Profile CardPM
Go to the top of the page
+Quote Post
jimkelly
post Jul 6 2009, 11:35 AM
Post #8


Delaware USA
****

Group: Members
Posts: 4,969
Joined: 5-August 04
From: Delaware, USA
Member No.: 2,460
Region Association: MidAtlantic Region
thanks!

i converted them to jpg in case it helps anyone.


Attached image(s)
Attached Image Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
jimkelly
post Jul 6 2009, 11:37 AM
Post #9


Delaware USA
****

Group: Members
Posts: 4,969
Joined: 5-August 04
From: Delaware, USA
Member No.: 2,460
Region Association: MidAtlantic Region
14 pin
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Switch to: Standard · Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 9th May 2025 - 09:45 AM
Invision Power Board v9.1.4 © 2025  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...