 Yeah - another horn issue - 1973 914 |
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| dhempy |
 Jun 28 2020, 04:55 PM
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#1
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Newbie  Group: Members Posts: 6 Joined: 6-September 04 From: Carlsbad, CA Member No.: 2,698 Region Association: Southern California  |
Hello everyone,
I need some help tracking down a horn issue on my '73 914. I have had the car 20 years and can't remember the last time the horns worked. I decided to try to fix the horns before I installed a new JWest fuse box. Troubleshooting procedure 1. Orig horns did not work with 12v - bought new Hella Sharptone Hi/Lo twin horn kit 2. Installed new horns, ran a jumper from pin #30 (relay out) to pin #87 and the horns work. (And they sound great too). Does not work with the horn button yet (Ign on) 3. Ordered a couple new relays (just in case). I manually checked the old one(s) with a 12v small backup battery from my garage door opener connected to pins #85 & #86 on the relay - it clicks then i checked continuity at pins #30 & #87 - all good. Relays work but the horn still does not work (and no clicking at the relay) 4. Here is where I am stuck - pin #86 should have 12v (Ign on) and does not. I have continuity between #86 and fuse #8 but I do not have 12v at fuse 8 with the ignition on. Swapped fuse and checked continuity too on new fuse just to be certain. (IMG:style_emoticons/default/headbang.gif) How is 12v fed to fuse #8? What should I do next? Am I missing something? I want to get this resolved before I throw another variable into the mix by installing the JWest fuse box. All comments about this replacement fuse box are welcome (IMG:style_emoticons/default/biggrin.gif) At least the horns look cool installed  |
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| 914e |
Jun 28 2020, 05:05 PM
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#2
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Member Group: Members Posts: 496 Joined: 21-February 20 From: Arizona Member No.: 23,951 Region Association: Southwest Region 
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I think fuse 8 is fed by fresh air relay.
That fuse powers the coil of the horn relay. |
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| dhempy |
Jun 29 2020, 07:54 AM
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#3
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Newbie Group: Members Posts: 6 Joined: 6-September 04 From: Carlsbad, CA Member No.: 2,698 Region Association: Southern California |
Thanks 914e!.
I'll check that later today. |
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| dhempy |
Jul 2 2020, 03:24 PM
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#4
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Newbie Group: Members Posts: 6 Joined: 6-September 04 From: Carlsbad, CA Member No.: 2,698 Region Association: Southern California |
Yeah it was the fresh air relay. It clicked but the points were burnt.
Thanks 914e! |
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| brant |
Jul 2 2020, 03:32 PM
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#5
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914 Wizard Group: Members Posts: 11,639 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(dhempy @ Jul 2 2020, 03:24 PM)  Yeah it was the fresh air relay. It clicked but the points were burnt. Thanks 914e! dave where is that fresh air relay located? On the back of the fuse board... or under the fresh air motor? I need to check mine today does anyone have instructions about which relay on the back of the fuse panel is for which item? brant |
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| 914e |
Jul 2 2020, 05:08 PM
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#6
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Member Group: Members Posts: 496 Joined: 21-February 20 From: Arizona Member No.: 23,951 Region Association: Southwest Region
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| brant |
Jul 2 2020, 08:53 PM
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#7
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914 Wizard Group: Members Posts: 11,639 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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Thank you!
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