Resistor pack - Replacing with proper valued ceramics. Including pictures! - MG-Rover.org Forums
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post #1 of 58 (permalink) Old 18-09-2012, 19:02 Thread Starter
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Resistor pack - Replacing with proper valued ceramics. Including pictures!

Ceramic heater resistor repair packs as below now for sale - 5.50 including postage.

Well, speeds 1 and 2 predictably don't work on my new 45.

Decided to fix it properly, and make a kit up using ceramic resistors. Not just ceramic resistors though - ones with the proper OEM spec values!

I had previously fitted all 1-ohm items, which although working OK made the lower speeds slow and 3 too fast. Fail.

So after a bit of digging, I made up resistors with the following values:
Low: 1.5 Ohm
Medium: 0.75 Ohm
High: 0.23 Ohm

I had to double up on the medium and high speeds, both to get the correct values and also to prolong the life of the packs. Low is a standard 10w item, medium is rated at 20w (2x10w) and high at 14w (2x7w).

Some pictures...

The original:



Resistors with flyleads:



Finally, done!





Fitting was a doddle, a little tight for space but I got there in the end.

Speeds are bang on what I remember from my first 400, excellent!

I've got a good few left over, if anyone wants a set sending out I can do for 5.50 including postage with flyleads attached as pictured (pretty much what they cost me to make). If you cover postage I'll also more than happily fit them for you to your existing pack.

Last edited by DMGRS; 20-01-2013 at 12:40.
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post #2 of 58 (permalink) Old 18-09-2012, 21:18
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i could well be interested mate, my 1-2 just went a 3 is annoying the hell out of me, do you take paypal mate??

thanks steve
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post #3 of 58 (permalink) Old 18-09-2012, 22:05
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Just out of interest what wire is used for the fly leads ?
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post #4 of 58 (permalink) Old 19-09-2012, 09:19 Thread Starter
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I've used 6A rated normal power cable for the fly leads - the insulation is resistant to the temperatures reached and some more for a bit of headroom.

I do indeed take PayPal, address is dellboymat@yahoo.co.uk. Put your address in the notes and I'll send one over.
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post #5 of 58 (permalink) Old 20-09-2012, 02:37
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Thats the exact same method I use ROFL !

Can't be arsed with Maplin any more, they never have all 3 I need.
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post #6 of 58 (permalink) Old 20-09-2012, 17:56 Thread Starter
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Quote:
Originally Posted by ROVER-25X View Post
Thats the exact same method I use ROFL !

Can't be arsed with Maplin any more, they never have all 3 I need.
Fair enough, well I'm getting more in so I don't run out any time soon. Seems a lot of demand, they're shifting well on eBay!
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post #7 of 58 (permalink) Old 20-09-2012, 23:06
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You saving me the efforts of going to all the bloody Maplins too ROFL.
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post #8 of 58 (permalink) Old 16-10-2012, 19:04 Thread Starter
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After nearly a month and 3,000 miles I took mine out of my 45 to have a look - all look 100% as they did when they went in, and all speeds still OK.

I'm now using a 6 resistor design - a total power dissipation of 42w compared to the original 30w means you won't be doing these again in a hurry.

I've done this by 'doubling up' 7w resistors in pairs for each speed - while still keeping the original selling price at 5.50. The 6 resistor kits are a bit more to make, so it's lucky I like you guys.

If you're DIY'ing, the values you need when you 'double up' are 3.3 ohm, 1.5 ohm and 0.47 ohm. They'll give you values nearly identical to the originals, and they're what I supply with the kit.
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post #9 of 58 (permalink) Old 16-10-2012, 23:33
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Hi - I'm definately interested in this and would happily post you my old resistor pack. Any chance you could PM me an address and details of how you would prefer payment?

Cheers,

Wigster.
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post #10 of 58 (permalink) Old 19-10-2012, 19:17
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received mine today and installed no probs, thanks mate, brilliant service!!
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post #11 of 58 (permalink) Old 19-10-2012, 21:39 Thread Starter
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Quote:
Originally Posted by andy1weir View Post
received mine today and installed no probs, thanks mate, brilliant service!!
Glad you like them, a lot of R&D and sitting with the blowers on for hours went into the latest version.

Edit: These are the ones I make now:

Last edited by DMGRS; 19-10-2012 at 21:51.
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post #12 of 58 (permalink) Old 23-10-2012, 20:24
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Thumbs up Resistors

I bought these on eBay and they work brilliant. Took a while to get them to fit right but if you take your time there well worth the money.

Cheers

Adi
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post #13 of 58 (permalink) Old 20-11-2012, 13:14
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mattyprice4004, I sent you a PM. Please answer it when you can.

Regards.
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post #14 of 58 (permalink) Old 21-11-2012, 15:59
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I have also sent a further PM.

Cheers,

Wigster.
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post #15 of 58 (permalink) Old 20-01-2013, 12:37 Thread Starter
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Made about 30 kits up over the weekend (stuck in with bad weather!).
I know of 3 friends using the kit, all still working 100%. Happy happy happy days.

Kits are 5.50 including P+P. PayPal details in signature.
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post #16 of 58 (permalink) Old 24-01-2013, 19:08
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All arrived in super-quick time. Thanks Mat.

Andy G.
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post #17 of 58 (permalink) Old 27-01-2013, 22:02
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These kits look good! Maybe a bit of a stupid question but how come one and two dont work when three and four speeds do?
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post #18 of 58 (permalink) Old 27-01-2013, 22:17 Thread Starter
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The answer is pretty simple:

- Speed one is the finest as it's resistance must be the greatest to produce the lowest fan speed. This fails the most.
- Speed two a bit thicker as it's resistance is a little less for a middling speed. This fails for the same reason as #1, however tends to last a bit longer.
- Speed 3 rarely fails as it's heavy gauge wire and doesn't have to drop a lot of power as heat. Still, I include it as I'd rather all 3 were changed.

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post #19 of 58 (permalink) Old 27-01-2013, 22:24
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I think I understand that - Thanks!!!!!
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post #20 of 58 (permalink) Old 27-01-2013, 22:40 Thread Starter
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Quote:
Originally Posted by Minty86 View Post
I think I understand that - Thanks!!!!!
No worries at all. A rather poor design, but thankfully very cheap and easy to sort out.
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