can’t find these diodes anywhere pic

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=95543
Printed Date: May 13, 2025 at 1:09 AM

Topic: can’t find these diodes anywhere pic

Posted By: slamdaccord
Subject: can’t find these diodes anywhere pic
Date Posted: July 12, 2007 at 5:13 PM

i searched and searched and can't find these diodes anywhere. does anyone know where i can find these or if there is a specific name for them? i tried "diode and blocking diode" and came up with nothing

posted_image

Replies:

Posted By: ringojam
Date Posted: July 12, 2007 at 6:02 PM

All that is is two 3amp diodes with heat wrap on them ,the are usually found in prestige remote start alarms,used to isolate the hood pin switch.

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Posted By: the12volt
Date Posted: July 12, 2007 at 6:02 PM

It's just two 1 amp diodes (1N4001/L) soldered together at the anode ends most likely and to three wires, then wrapped in heat shrink.

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Posted By: slamdaccord
Date Posted: July 12, 2007 at 6:42 PM

so if i get these...which way are the bands/rings around the diodes suppose to face - towards the alarm or away from the alarm? ive used these before but i forget everytime

https://cgi./575-Diode-Assortment-1N4001-1N5365B-NEW-D1_W0QQitemZ150140806642QQihZ005QQcategoryZ7287QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

Posted By: peterubers
Date Posted: July 12, 2007 at 7:00 PM

The anode is the side AWAY from the line, so solder as follows:

--Cathode------------( I )------Anode------------\______________Solder to below

---Cathode-----------( I )------Anode-----------/''''''''''''''''''''''''''''''''''''''''''''''''''''Solder to above

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Posted By: KarTuneMan
Date Posted: July 12, 2007 at 10:47 PM

1. Cathode (side with the stripe) 2. Anode (side without the stripe) 3. Anytime the cathode is more positive than the anode, no current will flow.

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Posted By: JWorm
Date Posted: July 12, 2007 at 11:10 PM

slamdaccord wrote:

so if i get these...which way are the bands/rings around the diodes suppose to face - towards the alarm or away from the alarm? ive used these before but i forget everytime

https://cgi./575-Diode-Assortment-1N4001-1N5365B-NEW-D1_W0QQitemZ150140806642QQihZ005QQcategoryZ7287QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

You can't post eBay link on this forum, so I can't see this link and I don't feel like guessing the correct address. Just go to Radio Shack. They are like $.89 for a pack of 2 diodes. You want 1N4001 diodes.

You still haven't said what you are trying to accomplish with the diodes. I'm going to guess you are trying to isolate some (-) door trigger wires. In the pictures in your first post, put the diode stripes on the right side. Connect the 2 wires on the right to the door triggers in the car. Connect the wire on the left side to the alarm brain.

Posted By: howie ll
Date Posted: July 13, 2007 at 2:29 PM

Directed supply them as 2 x1n 500 series for direction indicators for European i.e. Uk market or make them up ourselves for BMW Ford etc , you know the part where it says "diode isolate" posted_image Seriously though the UK equivalents to Scosche etc. sell them made up as alarm accessories, oh what a surprise.

Sorry its Friday evening and I'm in a cynical mood, surely anyone aspiring to install alarms should know about diodes and their applications e.g. UK Mini requires 6 x 500 series for indicators and 2 x 400 series for door contacts.