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MG TD TF 1500 - How to test Flaser Relay DB-10 ?

Does anyone know how to test the flaser relay ??

Moss parts # 141-400
Lucas DB-10

I want to test it before installing it in the car.
Also how do I remove the lid ??

Thanks,
Jose Vicente Vargas

Jose, if it's one of the new Moss units you don't need to remove the cover. It's a soild state unit and it either works or it doesn't. If you have and older unit then it will have points and coils and such and may possibly be adjusted or serviced. You remove the cover by bending back the "tangs" that hold the case on. You can see how they work from the bottom of the unit.

The only way I know how to test it is to wire it up. You can substitute a test light for the turn signals.
LaVerne Downey

Jose,

Here is the procedure for testing the flasher relay out of the car:

You need the following tools:

12 volt supply, a battery charger is best, DON’T use a car battery.
An ohmmeter, or any continuity tester.

Identify and note the connectors, they are numbered on the lid from 1 to 8.

The first test is to determine if the two coils are working.

Clip the positive wire from your 12v supply to the body of the relay,
With the negative wire, touch connector number 4, you should hear a small click, if so then one coil is OK.
Now touch connector 8 you should again hear a click, if so then both the coils are OK..

If any of these 2 tests fail then your coils are bad, they may be burnt out. Not easy to fix.

The second test is to check the normally closed contacts:

With the 12v supply removed, connect the ohmmeter between connector 5 & 7, you should get 0 ohms (closed circuit)
Then connect the ohmmeter between 5 & 3, again you should also get 0 ohms.

The third test is to check the normally open contacts.

Again Clip the positive wire of the 12v supply to the body of the relay.

Connect the ohmmeter between 1 & 2 it should be open (infinite resistance), now with the negative wire of the 12v supply touch and hold connector 4
The ohmmeter should read 0 ohms. Remove and replace the negative wire several times, you should see the ohmmeter swinging from opened to closed.

Connect the ohmmeter between 1 & 3 it should be open (infinite resistance), now with the negative wire of the 12v supply touch and hold connector 4
The ohmmeter should read 0 ohms. Remove and replace the negative wire several times, you should see the ohmmeter swinging from opened to closed.


Connect the ohmmeter between 1 & 7 it should be open (infinite resistance), now with the negative wire of the 12v supply touch and hold connector 8
The ohmmeter should read 0 ohms. Remove and replace the negative wire several times, you should see the ohmmeter swinging from opened to closed.


Connect the ohmmeter between 1 & 6 it should be open (infinite resistance), now with the negative wire of the 12v supply touch and hold connector 8
The ohmmeter should read 0 ohms. Remove and replace the negative wire several times, you should see the ohmmeter swinging from opened to closed.

If all readings are as above then the relay box is working, if not then you need to remove the lid and clean and/or adjust the defective contacts.

Note: The mention of positive and negative is only for clarity, in fact, the relay is not polarity sensitive.

.
John
J Scragg

John

Thanks for that information - wll be printed and filed

Ian
TF4056
Ian Fry

This thread was discussed between 05/07/2010 and 07/07/2010

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