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1. An ohmmeter check resistance between contacts of the relay. Between contacts the 3 and 4 conductivity has to be absent, and between contacts 1 and 2 there has to be a conductivity. |
| 2. Additional wires connect plugs of the rechargeable battery to contacts 1 and 2, at the same time contacts 3 and 4 have to become isolated and resistance between them has to be equal to 0. |
| 3. In the absence of conductivity between the corresponding contacts when checking, replace the relay. |
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