 Tach signal - not making it to dash...., where do i look? |
|
|
|
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. |
|
|
| Aaron Cox |
 Jun 9 2006, 09:38 PM
Post
#1
|
|
Professional Lawn Dart  Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California  |
allrighty...
tach worked fantastic before paint.... now everything is reassembled and the tach doesnt work.... mallory CDI box with modded tach (see CDI tach mod) worked flawlessly, and a late gauge would work fine too... now, early modded tach doesnt work, nor does a late model tach. i checked gauge connections, and i checked engine bay connection. the blk/purp wire connects to tach output of CDI box, and is plugged in at gauge... where should i be looking??? no signal is making it to the tach... (IMG:style_emoticons/default/sad.gif) |
   |
 
|
  |
Replies(1 - 4)
| DNHunt |
Jun 9 2006, 09:53 PM
Post
#2
|
|
914 Wizard? No way. I got too much to learn. Group: Members Posts: 4,099 Joined: 21-April 03 From: Gig Harbor, WA Member No.: 598 |
Get a volt meter and check continuity of the black purple wire from the coil end to the gauge end (broken conductor). Then check the black purple wire for continuity to ground (short to ground). Check fuse S-9 (74). Check the red and white wire from the fuse to the gauge for continuity and short to ground if blown.
Dave |
|
|
|
| Dave_Darling |
Jun 9 2006, 09:54 PM
Post
#3
|
|
914 Idiot Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
|
Follow the wire. It goes to the relay board, then through the board into the main wiring harness. From there it goes to the tach.
Check to make sure the T-12 and T-14 plugs are plugged in correctly and fully seated on the relay board. Make sure the black/purple wire is in the right spots in both connectors. Make sure the connections on the relay board are OK, and that there is connectivity from the one pin to the other.... --DD |
|
|
|
| Aaron Cox |
Jun 9 2006, 10:19 PM
Post
#4
|
|
Professional Lawn Dart Group: Retired Admin Posts: 24,541 Joined: 1-February 03 From: OC Member No.: 219 Region Association: Southern California |
i believe the signal out of the box is a 12v square wave... (what i think i read....)
ill check fuses... and retrace wires.... ill put an oscilliscope on it tommorow if i have time before work.... little things holdin me down LOL |
|
|
|
| Dr Evil |
Jun 9 2006, 10:42 PM
Post
#5
|
|
Send me your transmission! Group: Members Posts: 23,002 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region
|
Dude, you dont need an O scope, just disconnect the wire ends and see if you have continuity to each other and ground. If to ground, you have a prob (IMG:style_emoticons/default/rolleyes.gif)
|
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 17th June 2024 - 01:23 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.