Bosch Relays Where to Find New Ones Log Out | Topics | Search
Moderators | Register | Edit Profile

Australian RR Forums » Spirit Series » Bosch Relays Where to Find New Ones « Previous Next »

Author Message
Top of pagePrevious messageNext messageBottom of page Link to this message

Cliff Biggs
Experienced User
Username: cliffy

Post Number: 62
Registered: 09-2021
Posted on Wednesday, 31 August, 2022 - 13:55:   Edit PostDelete PostView Post/Check IP

Have perused the forum for naught and can't find any leads as to where to buy replacement Bosch relays Even non Bosch relays would be OK
All I've found are real cheap Amazon specials for about $3 each with plugs no less. They seem to be lager than the metal can Bosch ones but are similar in function

What does everyone use when they want to replace relays?
Top of pagePrevious messageNext messageBottom of page Link to this message

michael vass
Frequent User
Username: mikebentleyturbo2

Post Number: 762
Registered: 07-2015
Posted on Wednesday, 31 August, 2022 - 17:47:   Edit PostDelete PostView Post/Check IP

eBay
Top of pagePrevious messageNext messageBottom of page Link to this message

David Gore
Moderator
Username: david_gore

Post Number: 4117
Registered: 04-2003
Posted on Wednesday, 31 August, 2022 - 18:24:   Edit PostDelete PostView Post/Check IP

Cliff,

Here is a list of the currently available Bosch relays:

https://www.boschautoparts.com/g/relays

You will need to contact Bosch International to find your nearest USA Bosch stockist:

https://www.bosch.com/contact/

Top of pagePrevious messageNext messageBottom of page Link to this message

Darryl Watson
Experienced User
Username: inox

Post Number: 183
Registered: 04-2015
Posted on Thursday, 01 September, 2022 - 17:44:   Edit PostDelete PostView Post/Check IP

I use common readily available relays designed for automotive use. Make sure that any you buy have a diode across the coil to stop back EMF damaging electronics.
The pin configuration is in the manual.
Darryl
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark Aldridge
Frequent User
Username: mark_aldridge

Post Number: 817
Registered: 10-2008
Posted on Thursday, 01 September, 2022 - 19:15:   Edit PostDelete PostView Post/Check IP

Like Darryl and Mike, I use generic relays with diodes , sourced from ebay, or an online electronics supplier eg RS components or Switch electronics in the UK. No doubt there are similar suppliers in the USA.
Top of pagePrevious messageNext messageBottom of page Link to this message

Brian Vogel
Grand Master
Username: guyslp

Post Number: 3311
Registered: 06-2009
Posted on Friday, 02 September, 2022 - 07:31:   Edit PostDelete PostView Post/Check IP

I have been using what Richard Treacy used to term "supermarket relays," which is what Mark, Darryl, and Mike are using, too.

The following may prove helpful. If you get a Bosch-style relay with a diode it should be associated with terminals 85 and 86 which also makes those terminals "unidirectional."

Bosch & Lucas Relays with terminal annotations
Top of pagePrevious messageNext messageBottom of page Link to this message

Cliff Biggs
Experienced User
Username: cliffy

Post Number: 63
Registered: 09-2021
Posted on Friday, 02 September, 2022 - 10:54:   Edit PostDelete PostView Post/Check IP

Thanks Looking on line tonight
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark Aldridge
Frequent User
Username: mark_aldridge

Post Number: 818
Registered: 10-2008
Posted on Friday, 02 September, 2022 - 20:50:   Edit PostDelete PostView Post/Check IP

Brian's relay comparison is useful and the late type relays do not suffer from corrosion around the rivets ( a problem I have had on my Shadow and S1). A resistor ( from memory about 600 ohm) or diode can be fitted in the relay base socket to overcome absent diodes between terminals 85 and 86.
Top of pagePrevious messageNext messageBottom of page Link to this message

Brian Vogel
Grand Master
Username: guyslp

Post Number: 3312
Registered: 06-2009
Posted on Saturday, 03 September, 2022 - 01:47:   Edit PostDelete PostView Post/Check IP

Mark,

But is such a modification even warranted for cars of the era where the Lucas 6RA was used? We just don't have stuff that can be disturbed in the same way as more modern cars do.

If I'm buying new relays, I look for ones with diodes fitted these days, but I've replaced Lucas relays with other Lucas relays and, later, third party relays that do not have diodes on my SY series cars without any issue.

Brian, who also fitted a diode when I rebuilt my dual SU fuel pump rather than using the resistor supplied.
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark Aldridge
Frequent User
Username: mark_aldridge

Post Number: 819
Registered: 10-2008
Posted on Saturday, 03 September, 2022 - 02:06:   Edit PostDelete PostView Post/Check IP

Brian, I generally don't bother, but on my S1 I have an electronic fan controller, electronic ignition and a modern radio cd concealed ( hence conversion to an alternator). Probably totally unnecessary. Also using your conversion I have replaced a number of the hidden relays on the S1 with modern relays. The repro Lucas relays are 30+ each and a poor copy. I like the originals where they can be seen.
On a similar note, do not replace blade fuses with cheap spares. I have had a headlight fuse on my S1 which has upgraded fused relay headlight dipping, melt the fuse plastic whilst no fault and running 50% capacity. The fuse did not blow . I have heard of similar problems. All fuses now replaced with premium fuses( eg Littlefuse). Worth checking fuseboard on later SZ series.
Top of pagePrevious messageNext messageBottom of page Link to this message

Cliff Biggs
Experienced User
Username: cliffy

Post Number: 64
Registered: 09-2021
Posted on Saturday, 03 September, 2022 - 12:03:   Edit PostDelete PostView Post/Check IP

Mark
Interesting point on the fuses
I'll be looking for Llittlefuse replacements now
Top of pagePrevious messageNext messageBottom of page Link to this message

Cliff Biggs
Experienced User
Username: cliffy

Post Number: 68
Registered: 09-2021
Posted on Wednesday, 07 September, 2022 - 11:36:   Edit PostDelete PostView Post/Check IP

Just a question-
Did the SZs all come with internal diodes or resistors on the Bosch relays from the factory ?
Or is this a modern adaptation for better longevity?
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark Aldridge
Frequent User
Username: mark_aldridge

Post Number: 822
Registered: 10-2008
Posted on Wednesday, 07 September, 2022 - 19:20:   Edit PostDelete PostView Post/Check IP

Cliff, all post 20000 series cars in the UK, but injection arrived earlier in the USA, so may be earlier in the export series cars . I would be tempted to Replace as original.
Mark
Top of pagePrevious messageNext messageBottom of page Link to this message

Darryl Watson
Experienced User
Username: inox

Post Number: 188
Registered: 04-2015
Posted on Wednesday, 07 September, 2022 - 20:56:   Edit PostDelete PostView Post/Check IP

I think the link below will explain the purpose of the diode across a coil.

As apprentices we would give people shocks using a coil and a battery.

It's been over half a century since I learned about such things.

Regards,
Top of pagePrevious messageNext messageBottom of page Link to this message

Cliff Biggs
Experienced User
Username: cliffy

Post Number: 69
Registered: 09-2021
Posted on Thursday, 08 September, 2022 - 03:11:   Edit PostDelete PostView Post/Check IP

Thanks guys I really do appreciate the thoughts but I do understand the purpose of the diodes and also how they work (55 years as an aircraft mechanic) but I was just wondering if the SZ cars used diodes when they first came out without some of the electronics later ones had. Not much electronics until the fan speed module or K lamda injection and the electronic ignition module.

Of course later SZs (92-3?) had all the smaller electronic pieces for seats and windows, etc.

I can see how on the later SZs that they might have been necessary but again did they have diodes on the relays in the earlier SZs (up to about 89-90)? I can't find any reference for them anywhere I've looked.
Top of pagePrevious messageNext messageBottom of page Link to this message

Mark Aldridge
Frequent User
Username: mark_aldridge

Post Number: 823
Registered: 10-2008
Posted on Thursday, 08 September, 2022 - 09:22:   Edit PostDelete PostView Post/Check IP

Cliff, my 1988 and 1990 Model year SZs both have diode relays.
Mark
Top of pagePrevious messageNext messageBottom of page Link to this message

David Gore
Moderator
Username: david_gore

Post Number: 4119
Registered: 04-2003
Posted on Thursday, 08 September, 2022 - 18:56:   Edit PostDelete PostView Post/Check IP

Here is the article mentioned by Daryl above - I have removed the link from his post to allow this thread to be viewed without scrolling:

application/pdfPDF
a-laymans-guide-to-coil-suppression.pdf (968.0 k)


Top of pagePrevious messageNext messageBottom of page Link to this message

Cliff Biggs
Experienced User
Username: cliffy

Post Number: 71
Registered: 09-2021
Posted on Friday, 09 September, 2022 - 05:30:   Edit PostDelete PostView Post/Check IP

Interesting and informative article that I will file away

Add Your Message Here
Post:
Bold text Italics Underline Create a hyperlink Insert a clipart image

Username: Posting Information:
This is a public posting area. Enter your username and password if you have an account. Otherwise, enter your full name as your username and leave the password blank. Your e-mail address is optional.
Please quote Chassis Numbers for all vehicles mentioned.
Password:
E-mail:
Action: