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A 12 month conditional guarantee is given with all regulator and dynamo conversions as standard.

This guarantee covers faulty components and labour.

Conditional means the following:

That the regulator and dynamo shall be installed exactly as per our written instructions by a qualified or at least an electrically competent person into a vehicle with known good wiring, no known electrical faults and is used for its designed purpose.

If it's just a regulator conversion then the above applies and also the regulator shall be connected to a dynamo with a healthy output of the correct polarity

If within 12 months from the date of invoice your regulator should stop working due to its internal components failing through normal use it will be replaced free of charge.

Please contact us before sending the unit back.

This guarantee starts from the date on our invoice NOT from when you fit your conversion.

It is impossible to build a bullet proof electronic regulator that will withstand anything you throw at it. These regulators are pretty well protected againts the kind of faults they will come up against IN NORMAL USE. Each regulator is tested after manufacture and again before fitting into your case then each completed conversion is bench tested at full load for 30 minutes, then 15 minutes at half load and finally 15 minutes at no load (just battery charging).

Bench testing is carried out by connecting the regulator to our fully overhauled 1979 vintage (one of the very last) CRYPTON CH10 electrical test bench that has variable dummy loads so that the load can be altered to reflect real life conditions. We use a fan heater to blow warm air over the regulator during testing to further simulate under bonnet conditions.

We also test dynamo rebuilds and conversions on the CH10.


Every unit once tested leaves us in perfect working order.

Every unit is accompanied with comprehensive installation instructions unique to your particular installation, not just a standard set of instructions.


  So for example, in the case of an installation requiring a polarity change and re-polarisation of the dynamo (a negative earth conversion) full instructions and comprehensive fool proof advice on how to do this are included. I always advise that the dynamos wiring and associated wiring are visually inspected and continuity tested before fitting a regulator.


If you decide to ignore the instructions and install the regulator and you damage it in doing so then the guarantee will not cover this. 

Likewise, if you decide to fit the regulator to a vehicle with less than perfect electrics (bare wires, taped joints etc) and it gets damaged in doing so then again the guarantee will not cover this. If the regulator does not start working straight away on start up (i.e. the battery light goes out /charge shown on the ammeter) then the fault will be something you have done wrong or forgotten to do. Positive and negative battery terminals are different sizes for a reason - to stop you connecting them the wrong way round. 


Connecting a negative earth regulator to a dynamo or system that is positive earth could damage it once the battery is connected!


Common sense advice is clearly given with each conversion. For example always dis-connect the battery before starting work and double check everything BEFORE re-connecting the battery and starting the engine. If in doubt, go back and make sure everything is as it should be.

Check, check and check again!


If you in any way doubt your ability to install the regulator properly then entrust the job to a qualified auto electrician or other electrically competent person.


If fitted properly your regulator will give many years of good service. If fitted properly it will work straight away.

If fitted wrong it won't work at all!

For example, if you connect D&F back to front on the regulator or the dynamo you stand a good chance of ruining the regulator before you've even started. If when you connect the battery the fuse blows, disconnect the battery and find what the problem is although if you make sure all is correct first the fuse won't blow in the first place! 

A common sense approach MUST be adopted in the installation with an emphasis on checking over your work BEFORE connecting the battery. Even if you are an auto electrician you can make mistakes during installation, but so long as these mistakes are found and rectified BEFORE connecting the battery, all will be well. If you don't know anything about auto electrics do not attempt to install an electronic regulator. It's cheaper to employ an auto electrician then to buy a replacement regulator!

Please don't expect us to replace under guarantee a regulator that has been damaged due to wrong or incompetent fitting.


If a regulator is returned to us as faulty it can be tested to see if it has been damaged by wrong connection, wrong polarity or wrong voltage.


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