 SOT: Two Failed Relays in 9 months |
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| 76-914 |
 Oct 10 2019, 01:31 PM
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#1
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Repeat Offender & Resident Subaru Antagonist  Group: Members Posts: 13,494 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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Different labels but I suspect the same mfg. SOT: because this is on a conversion car.
  This was the first to go. It was installed on the starter solenoid circuit to reduce the load on the switch. I'm guessing the amp load was < 3A. Relay is rated for 10x that amount. Look how misaligned the contact is. It was only contacting on the edge. Both relays #1-would make contact when activated but would not pass enough voltage to work. #2- had misaligned contacts that appear be made of copper and have rounded edges.  This one controlled the right side fan and was sealed so I cut it open.  Same issue here with the misaligned contacts. Load on this one is <13A. Both of these relays would pass the bench test when ohming out but neither would pass enough voltage to operate the fan or starter solenoid. I tried t capture the contact point between a set of contacts. It is a very small spec on the bottom side of the middle contact. I'll ask around before buying anymore relays.   |
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| Andyrew |
Oct 10 2019, 01:38 PM
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#2
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Spooling.... Please wait Group: Members Posts: 13,376 Joined: 20-January 03 From: Riverbank, Ca Member No.: 172 Region Association: Northern California
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I've found most relays you can buy to be pretty cheap quality.. Ive bought a few 5 post relays for my headlight up/down wiring and every one of them when you squeeze them they fail or wig out.
Anyways... I feel for you! |
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| dr914@autoatlanta.com |
Oct 10 2019, 02:32 PM
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#3
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914 Guru Group: Members Posts: 7,833 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
certainly cheap relays these days, but did you check to make sure that the alternator was not overcharging?
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| Beebo Kanelle |
Oct 10 2019, 02:56 PM
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#4
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Member Group: Members Posts: 248 Joined: 22-November 12 From: Houston, Texas Member No.: 15,177 Region Association: Southwest Region
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Or, conversely, make sure the voltage is not dropping when energized, causing excessive amperage through the coil.
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| Chi-town |
Oct 10 2019, 02:56 PM
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#5
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Senior Member Group: Members Posts: 850 Joined: 31-August 18 From: Disneyland Member No.: 22,446 Region Association: Southern California |
Find a tyco or P&B relay and you'll be happy
https://www.amazon.com/TE-Connectivity-V232...ial&sr=1-24 |
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| 76-914 |
Oct 10 2019, 03:51 PM
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#6
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,494 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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QUOTE(dr914@autoatlanta.com @ Oct 10 2019, 01:32 PM)  certainly cheap relays these days, but did you check to make sure that the alternator was not overcharging? QUOTE(Beebo Kanelle @ Oct 10 2019, 01:56 PM) Or, conversely, make sure the voltage is not dropping when energized, causing excessive amperage through the coil. QUOTE(Chi-town @ Oct 10 2019, 01:56 PM) Find a tyco or P&B relay and you'll be happy https://www.amazon.com/TE-Connectivity-V232...ial&sr=1-24 |
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| 914forme |
Oct 10 2019, 06:52 PM
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#7
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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Go solid state (IMG:style_emoticons/default/poke.gif)
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| ClayPerrine |
Oct 10 2019, 08:53 PM
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#8
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Life's been good to me so far..... Group: Admin Posts: 15,436 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(914forme @ Oct 10 2019, 07:52 PM) (IMG:style_emoticons/default/agree.gif) That is what I use on Igor for the DME. |
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| 76-914 |
Oct 11 2019, 09:25 AM
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#9
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,494 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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To be honest I didn't know they existed until Stephen mentioned them. Found them on the internet last night. Pricey but worth it if they perform well. Oddly enough, they fail in the closed position where as electro mechanical relays fail in the open position. There are also notations regarding switching problems with the solid state relays. I didn't get into that end too much, though. I think that was more to do with AC relays switching fluorescent fixtures than DC controlling DC circuits. Does anyone have any input on SS relays and harsh environments e.g. moisture & temps? (IMG:style_emoticons/default/beerchug.gif)
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| ClayPerrine |
Oct 11 2019, 09:31 AM
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#10
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Life's been good to me so far..... Group: Admin Posts: 15,436 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(76-914 @ Oct 11 2019, 10:25 AM) To be honest I didn't know they existed until Stephen mentioned them. Found them on the internet last night. Pricey but worth it if they perform well. Oddly enough, they fail in the closed position where as electro mechanical relays fail in the open position. There are also notations regarding switching problems with the solid state relays. I didn't get into that end too much, though. I think that was more to do with AC relays switching fluorescent fixtures than DC controlling DC circuits. Does anyone have any input on SS relays and harsh environments e.g. moisture & temps? (IMG:style_emoticons/default/beerchug.gif) Give me a few months of driving and I will get back to you. (IMG:style_emoticons/default/biggrin.gif) |
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| 914forme |
Oct 11 2019, 07:32 PM
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#11
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None
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914 rubber is making a set of them for the old round relays. Looking forward to that, I will replace every one in the -6
They get used a lot in environments that make your 914 driving on a Cali road look tame. Just watch out for Amperage rating and check pin-outs. Sometimes they switch pins for odd reasons. (IMG:style_emoticons/default/confused24.gif) I am running them in the EG conversion also. |
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| Spoke |
Oct 12 2019, 07:01 AM
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#12
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Jerry Group: Members Posts: 6,978 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None
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Do you have a protection diode on the contacts? There might be a hefty inductive kick on the contacts when the relay opens.
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| 76-914 |
Oct 12 2019, 09:12 AM
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#13
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,494 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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QUOTE(Spoke @ Oct 12 2019, 06:01 AM) Do you have a protection diode on the contacts? There might be a hefty inductive kick on the contacts when the relay opens. No, I do not and that is a good point. Kind of like the spike in the starter circuit? If it happens again I think this would be the logical path to pursue. Thx Jerry, I hoped that you'd weigh in on this subject. (IMG:style_emoticons/default/beerchug.gif) |
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| ThePaintedMan |
Oct 12 2019, 10:51 AM
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#14
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Advanced Member Group: Members Posts: 3,885 Joined: 6-September 11 From: St. Petersburg, FL Member No.: 13,527 Region Association: South East States
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Solid state, or grab a handful of Bosch versions at the junkyard. The guy here usually gives them to me for the price of admission ($2)
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