 Horn, High or low tone? |
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| EJP914 |
 Aug 10 2025, 08:06 PM
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#1
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Member  Group: Members Posts: 279 Joined: 14-June 03 From: Monroeville, PA Member No.: 821  |
Car is a 73 with 2 horns up front. Horn on the right side (passenger) has died.
Is the horn on the right side the hi tone or low tone? Dont know if this helps, but # 614/615/681 is on the backside. Thanks for the help. Ed |
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| Montreal914 |
Aug 10 2025, 08:17 PM
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#2
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Senior Member Group: Members Posts: 1,932 Joined: 8-August 10 From: Claremont, CA Member No.: 12,023 Region Association: Southern California 
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Frequency should be indicated on the horn.
- 914 635 103 11 is 335Hz - 914 635 104 11 is 400Hz I am pretty sure I have spare ones if you are looking for used ones. |
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| DennisV |
 Oct 13 2025, 10:32 AM
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#3
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Senior Member Group: Members Posts: 736 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California
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QUOTE(Montreal914 @ Aug 10 2025, 07:17 PM)  Frequency should be indicated on the horn. - 914 635 103 11 is 335Hz - 914 635 104 11 is 400Hz I am pretty sure I have spare ones if you are looking for used ones. Can someone offer clarification on the frequency markings? I have been through several threads, but am not clear on how to distinguish. Does it literally have "335" or "400" on it? The back of my horns don't have that. This one I believe is an early horn since it has bolts instead of rivets. Best I can surmise, the "T4" is the indicator? Its mate would be "H3"? Can anyone confirm or clarify? Maybe this is not a correct horn?  ALL MARKINGS molded into rear tiet DCM 6536 KA Hoch DGM 6537 KA B34 12V-T4 (think this is low) (Hella) Made in Germany 4 (A) 71300/1 G1 AGREE TP AR 614/615/ |
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| chmillman |
Oct 14 2025, 12:30 AM
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#4
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Member Group: Members Posts: 159 Joined: 15-June 24 From: Switzerland Member No.: 28,183 Region Association: Europe
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QUOTE(DennisV @ Oct 13 2025, 06:32 PM) ALL MARKINGS molded into rear tiet DCM 6536 KA Hoch DGM 6537 KA B34 12V-T4 (think this is low) (Hella) Made in Germany 4 (A) 71300/1 G1 AGREE TP AR 614/615/ Actually what it says is tief DGM 6536 KA hoch DGM 6537 KA TIEF=Low HOCH=High From that I suspect the plastic back part is the same used for both low and high, so you might not find the info there... |
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| DennisV |
Oct 14 2025, 07:10 AM
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#5
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Senior Member Group: Members Posts: 736 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California
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QUOTE(chmillman @ Oct 13 2025, 11:30 PM) Actually what it says is tief DGM 6536 KA hoch DGM 6537 KA TIEF=Low HOCH=High (IMG:style_emoticons/default/ohmy.gif) Thanks for that. I tried various ways to look up DGM, DCM, and KA to see if they somehow related to MHz, but didn't find anything that made sense. According to our AI overlord: (IMG:style_emoticons/default/robot.gif) DGM 6536 KA / DGM 6537 KA = Italian homologation codes (DGM = Direzione Generale della Motorizzazione, Italy’s transport authority). They’re approval numbers, not acoustic data. |
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| Shivers |
Oct 14 2025, 07:18 AM
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#6
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Senior Member Group: Members Posts: 3,141 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
QUOTE(DennisV @ Oct 14 2025, 06:10 AM) QUOTE(chmillman @ Oct 13 2025, 11:30 PM) Actually what it says is tief DGM 6536 KA hoch DGM 6537 KA TIEF=Low HOCH=High (IMG:style_emoticons/default/ohmy.gif) Thanks for that. I tried various ways to look up DGM, DCM, and KA to see if they somehow related to MHz, but didn't find anything that made sense. According to our AI overlord: (IMG:style_emoticons/default/robot.gif) DGM 6536 KA / DGM 6537 KA = Italian homologation codes (DGM = Direzione Generale della Motorizzazione, Italy’s transport authority). They’re approval numbers, not acoustic data. These are for sale on evilbay. They have the same markings https://www.ebay.com/itm/334667237578?chn=p...b-oAQ-UrP1RKFZM |
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| DennisV |
Oct 14 2025, 07:30 AM
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#7
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Senior Member Group: Members Posts: 736 Joined: 8-August 20 From: Santa Rosa, CA Member No.: 24,575 Region Association: Northern California
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QUOTE(Shivers @ Oct 14 2025, 06:18 AM) These are for sale on evilbay. They have the same markings https://www.ebay.com/itm/334667237578?chn=p...b-oAQ-UrP1RKFZM I looked at those. They are very close, but you can see different markings partially blocked by the bracket. "4" (I'm assuming beginning of "400") on one and "Hz" on other. I think I'm piecing this together now, thanks to the translation. "T4" = Low "H3" = High |
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| chmillman |
Oct 14 2025, 07:56 AM
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#8
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Member Group: Members Posts: 159 Joined: 15-June 24 From: Switzerland Member No.: 28,183 Region Association: Europe
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QUOTE(DennisV @ Oct 14 2025, 03:30 PM) I looked at those. They are very close, but you can see different markings partially blocked by the bracket. "4" (I'm assuming beginning of "400") on one and "Hz" on other. I think I'm piecing this together now, thanks to the translation. "T4" = Low "H3" = High Well, 400Hz is higher than 335Hz. So 335 would be the low tone and 400 the high tone. |
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