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 )

> Crazy ride home. Lots of dash stuff quit working.
malcolm2
post Jul 6 2017, 07:01 PM
Post #1


Advanced Member
****

Group: Members
Posts: 2,747
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
Took a trip downtown to get some Brad Penn. Then to a favorite brewery, Honky Tonk Brewery. On the way home I hear the stereo stop, then start again. I then see almost nothing on the dash works. No RPM, speedo is working but too high. no oil temp or fuel, no a/f, no oil pressure, no blinkers, you name it. The G light is on cht gauge too tho. Hazzards and dash illumination work. Head lights work, fog lights work. All the rear lights work at once. No brakes, just tail, etc…

Guess i have a weekend project. Thoughts?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
2 Pages V  1 2 >  
 Reply to this topicStart new topic
Replies(1 - 19)
tygaboy
post Jul 6 2017, 07:06 PM
Post #2


914 Guru
*****

Group: Members
Posts: 5,558
Joined: 6-October 15
From: Petaluma, CA
Member No.: 19,241
Region Association: Northern California
Stock speedo? That'd be cable driven so...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Jul 6 2017, 07:18 PM
Post #3


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,885
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
Clark, the 'G' light is the generator (alternator) indicator.

Alternator belt still there?

Voltage regulator working?

Time to check out the electrical system with a multi-meter.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jul 6 2017, 07:20 PM
Post #4


Advanced Member
****

Group: Members
Posts: 2,747
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
QUOTE(tygaboy @ Jul 6 2017, 08:06 PM) *

Stock speedo? That'd be cable driven so...


Yep. Weird but i had my cell phone mph app running. The dash is usually 5 to 8 behind, depending on speed. Tonight the dash was 8 ahead. Car ran perfectly. Zoomed all the was home as expected.

Just checked the batt. 12.7v with everything off. 13.9v + idling.

G light is working kinda backwards. Usually it starts and stays red til i rev. Now it is off till i rev then on.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Jul 6 2017, 08:33 PM
Post #5


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,885
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
I'd check for an intermittent ground. Check all the brown wires under the dash going to the multi-lug grounding hub to see if anything changes.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Jul 6 2017, 09:41 PM
Post #6


Jerry
*****

Group: Members
Posts: 7,158
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None
Fuse S9 powers most of those things you mentioned and is necessary to the operation of the GEN light.




Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jul 6 2017, 10:08 PM
Post #7


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

Group: Members
Posts: 15,161
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Yup, check the fuses.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Jul 6 2017, 10:28 PM
Post #8


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,885
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
Just curious ... if it was the fuse, wouldn't the gen light never come on? I know you'll have the answer, Jerry ...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Jul 6 2017, 11:17 PM
Post #9


Jerry
*****

Group: Members
Posts: 7,158
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None
QUOTE(euro911 @ Jul 7 2017, 12:28 AM) *

Just curious ... if it was the fuse, wouldn't the gen light never come on? I know you'll have the answer, Jerry ...


The simplified schematic above omits the tach, fuel gauge and some other electrical items powered from the battery through S9. With S9 open, now the GEN light powers (or tries to power) these items and is on. The electrical items may or may not function properly because of the large voltage drop across the GEN bulb.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mark Henry
post Jul 7 2017, 06:31 AM
Post #10


that's what I do!
***************

Group: Members
Posts: 20,065
Joined: 27-December 02
From: Port Hope, Ontario
Member No.: 26
Region Association: Canada
Grounds....grounds everywhere...
(IMG:http://www.914world.com/bbs2/uploads_offsite/cdn.pcwallart.com-26-1499430695.1.jpg)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GregAmy
post Jul 7 2017, 06:34 AM
Post #11


Advanced Member
****

Group: Members
Posts: 2,490
Joined: 22-February 13
From: Middletown CT
Member No.: 15,565
Region Association: North East States
Subscribing. I'm popping F9 now on occasion. I truly wish it was a bad ground, 'cause if one of all those wires is fooked it'll be a bear to find...

OP, how's that fuse?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jul 7 2017, 07:06 AM
Post #12


Advanced Member
****

Group: Members
Posts: 2,747
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
QUOTE(Spoke @ Jul 6 2017, 10:41 PM) *

Fuse S9 powers most of those things you mentioned and is necessary to the operation of the GEN light.


3 questions:
S9 or F9 as pictured?.... not that it really matters maybe S and F are the same in German? (IMG:style_emoticons/default/blink.gif)

2nd question is more important.... where is it?

And maybe I should be prepared with a replacement.... size?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jul 7 2017, 07:12 AM
Post #13


Advanced Member
****

Group: Members
Posts: 2,747
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
OK, nevermind... I guess I never knew the fuses were numbered, but it make sense. What is the F or S for?

I see you are right. Lots of stuff listed there. One I did not mention, but I had my wife check was the BACK-UP lights. They are out too. Maybe I was just paranoid about the speedo. Hell it was really the only thing that did work.

I hate it when you guys solve a problem for me while I am at work, then I can't go fix it (or at least check it) until AFTER WORK.....

I am feeling a sickness coming on. (IMG:style_emoticons/default/piratenanner.gif) (IMG:style_emoticons/default/piratenanner.gif)

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jul 7 2017, 07:21 AM
Post #14


Advanced Member
****

Group: Members
Posts: 2,747
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
QUOTE(Spoke @ Jul 7 2017, 12:17 AM) *



The simplified schematic above omits the tach, fuel gauge and some other electrical items powered from the battery through S9. With S9 open, now the GEN light powers (or tries to power) these items and is on. The electrical items may or may not function properly because of the large voltage drop across the GEN bulb.


That explains why the tach would register a small amount. Some other gauges did the same, just momentary flickers or attempts to work.

It's all coming together.

I am sure I would have checked the fuses this afternoon, but at least now I know exactly which one. (IMG:style_emoticons/default/beer.gif)

Thanks to all, and I will check the grounds while I am under the dash.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GregAmy
post Jul 7 2017, 07:53 AM
Post #15


Advanced Member
****

Group: Members
Posts: 2,490
Joined: 22-February 13
From: Middletown CT
Member No.: 15,565
Region Association: North East States
QUOTE(malcolm2 @ Jul 7 2017, 09:12 AM) *
What is the F or S for?

The German word for "fuse" is "sicherung"...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Jul 7 2017, 01:02 PM
Post #16


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

Group: Members
Posts: 15,161
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
Note that the stock fuse block has its connections on the back, and they are quite close to the metal panel that holds the block. This panel is held onto the chassis with metal screws, meaning it is grounded (if often not all that well).

If your fuse block shifts a little in place, it can cause one of the connectors to momentarily touch the mounting panel, popping a fuse.

Guess which one popped on my car every few weeks if I went over bumps? Hint: The tach dropped to zero and the charging light came on...

In my case, one of the screws that holds the fuse block onto the mounting panel had gone MIA, and the block would shift sometimes when things got bouncy. I replaced the screw and I think I may have also put some split tubing along the edge of the panel to keep anything from bumping in the future.

I don't want to think about what might have happened if it had been the other side of the fused connection that had shorted to ground....

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jul 7 2017, 01:28 PM
Post #17


Advanced Member
****

Group: Members
Posts: 2,747
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
QUOTE(Dave_Darling @ Jul 7 2017, 02:02 PM) *



I don't want to think about what might have happened if it had been the other side of the fused connection that had shorted to ground....

--DD


I am leaving work now, looking forward to pulling that fuse #9! (IMG:style_emoticons/default/popcorn[1].gif)

I have the JWest type that I inserted above. I will take it down and take a close look.

I was re-installing the fuse board once and the "L" shaped bracket that accepts the hold down screws had slipped under one of the relays. sparks galore...

I am much more careful now-a-days, but it is hard to be watching all the edges and brackets and corners as you wedge that wired board back in place. I probably should disconnect the battery to be safe.... (IMG:style_emoticons/default/shades.gif)

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
malcolm2
post Jul 7 2017, 03:28 PM
Post #18


Advanced Member
****

Group: Members
Posts: 2,747
Joined: 31-May 11
From: Nashville
Member No.: 13,139
Region Association: South East States
TA-DA

It was the fuse. The panel is bolted up tight. I'll pull it down tomorrow and give it a once over.

Thanks to all.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Spoke
post Jul 7 2017, 04:59 PM
Post #19


Jerry
*****

Group: Members
Posts: 7,158
Joined: 29-October 04
From: Allentown, PA
Member No.: 3,031
Region Association: None
QUOTE(malcolm2 @ Jul 7 2017, 03:28 PM) *

I was re-installing the fuse board once and the "L" shaped bracket that accepts the hold down screws had slipped under one of the relays. sparks galore...


Any time I drop the fuse panel I disconnect the negative cable on the battery. It's too easy to let the smoke out of wires and other items if there's a short.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Jul 7 2017, 09:45 PM
Post #20


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,885
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
QUOTE(malcolm2 @ Jul 7 2017, 02:28 PM) *
TA-DA

It was the fuse. The panel is bolted up tight. I'll pull it down tomorrow and give it a once over.

Thanks to all.

Attached Image
(IMG:style_emoticons/default/cheer.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V  1 2 >
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 - 11:48 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 ...