Help with Stebel horn wiring - Page 3 - LotusTalk - The Lotus Cars Community
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post #41 of 43 (permalink) Old 04-26-2016, 08:29 AM
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Commented on the other thread, but WRT grounding to the radiator, at least on my Exige, I am not sure the radiator is grounded on purpose anyway.....maybe through the AC liquid line........
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post #42 of 43 (permalink) Old 04-26-2016, 09:03 PM
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Thanks for your help/input, Lotusmotion and Exigegus. I will try moving the circuit around and/or changing the grounding point. I picked the radiator since I have an aluminum pro-Rad radiator and it had an easy attachment hole. I measured the same voltage between the + at the fuse box and the radiator as I did between the + and the chassis so I assumed it was grounded...

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post #43 of 43 (permalink) Old 04-28-2016, 10:01 PM
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Did some troubleshooting today, and finally figured it out. It turns out that it was a poor quality relay that was part of a wiring harness that I bought from Amazon(highly rated). It was a piece of crap made in China. It was sold as a wiring harness for air horns and actually had a picture of the Stebel horn on the packaging.

This is what was causing the engine to cut out. I did some troubleshooting by disconnecting wires and everything pointed to the actual relay because the engine did not cut out when power to the horn was disconnected. When I replaced the relay with the one from the Stebel horn package, it stopped cutting out. There must've been some type of voltage spike when I let go of the horn button which caused the engine to cut out like that. Finally, success!!...

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