Turn signal indicator light, Only blinks once ... |
|
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. |
|
Turn signal indicator light, Only blinks once ... |
Chaznaster |
Nov 14 2021, 05:45 PM
Post
#1
|
Member Group: Members Posts: 303 Joined: 22-November 15 From: Concord, MA Member No.: 19,389 Region Association: North East States |
Hi. I have been trying to troubleshoot the turn signal indicator light - the one on the speedo. It's a '74 so only one light that is supposed to blink regardless of the chosen direction. It is not worked since I have the car. The signals themselves and the hazards work fine.
Recently, I went through and replaced the dashboard bulbs and got nearly everything working. Not the turn signal, however. Interestingly, when I disconnect and connect the battery, then switch either the lever on the steering column or the hazards, the light comes on once (yay!) but then refuses to come on again (awww). My first thought is the hazard relay (the square one on the back of the fuse panel) might be bad. Before trying to replace it (I have read that the new ones are problematic), does anyone have any other suggestions? If not, what is the most reliable source for that relay these days?? Thank you. |
Spoke |
Nov 15 2021, 11:30 AM
Post
#2
|
Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
the light comes on once (yay!) but then refuses to come on again (awww). This is a common issue with the old OEM flashers. The secondary coil which powers the tach indicator loses efficiency over time and may flash once or twice then stop. There is an LED-compatible flasher available EP26 that is pin-compatible with the 914 flasher. It can drive standard bulbs or LEDs. The C2 pin on the EP26 out of the box isn't connected to anything. I modify them to put out 12V on C2 when flashing. The flashing of the tach indicator is not affected by the type of bulb used in the tach. LED or bulb can be used. |
Chaznaster |
Nov 15 2021, 03:04 PM
Post
#3
|
Member Group: Members Posts: 303 Joined: 22-November 15 From: Concord, MA Member No.: 19,389 Region Association: North East States |
the light comes on once (yay!) but then refuses to come on again (awww). This is a common issue with the old OEM flashers. The secondary coil which powers the tach indicator loses efficiency over time and may flash once or twice then stop. There is an LED-compatible flasher available EP26 that is pin-compatible with the 914 flasher. It can drive standard bulbs or LEDs. The C2 pin on the EP26 out of the box isn't connected to anything. I modify them to put out 12V on C2 when flashing. The flashing of the tach indicator is not affected by the type of bulb used in the tach. LED or bulb can be used. I was looking at the wiring diagrams and wonder whether the parking brake light works with the modified EP26 setup. Does it bypass the flasher circuit as in the OEM unit? And/or does it cause the turn signal indicator to light up as well? I am guessing there is only one coil in the EP26?! |
Spoke |
Nov 17 2021, 05:31 AM
Post
#4
|
Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
the light comes on once (yay!) but then refuses to come on again (awww). This is a common issue with the old OEM flashers. The secondary coil which powers the tach indicator loses efficiency over time and may flash once or twice then stop. There is an LED-compatible flasher available EP26 that is pin-compatible with the 914 flasher. It can drive standard bulbs or LEDs. The C2 pin on the EP26 out of the box isn't connected to anything. I modify them to put out 12V on C2 when flashing. The flashing of the tach indicator is not affected by the type of bulb used in the tach. LED or bulb can be used. I was looking at the wiring diagrams and wonder whether the parking brake light works with the modified EP26 setup. Does it bypass the flasher circuit as in the OEM unit? And/or does it cause the turn signal indicator to light up as well? I am guessing there is only one coil in the EP26?! The flasher system on the 914 is independent of the running lights. The only place they intersect is on the 1157 type bulbs which have 2 filaments, one for the running lights and one for the flasher system. The EP26 will work exactly like the OEM flasher in most ways. They both have low current flashing thresholds so it will flash when the ebrake is pulled or when driving LED turnsignals. The OEM secondary coil shown below is designed to light the tach indicator when flashing as long as two 1157 type bulbs are being lit. This is a safety feature if one turnsignal bulb is burned out; The signals will flash but the tach indicator will not to alert the driver of the bulb failure. EP26 doesn't have the secondary coil and pin C2 which goes to the tach indicator is open. I run a wire to connect C2 to 12V when flashing and open when not flashing just like the OEM. If you want to do this mod yourself you can pick up an EP26 at your FLAPS and add the wire. I show on my website where to make the connection. With EP26, the tach indicator will flash when you pull the ebrake since C2 will power the tach indicator anytime the unit is flashing. If you do buy an EP26, make sure it says LED-Compatible as EP26 is a re-used number from a Jeep and some of those units are still around and will not work with LEDs. Attached image(s) |
Lo-Fi Version | Time is now: 8th June 2024 - 03:16 AM |
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 ... |