Car Mechanics (UK) - - Electronics Doctor -

In this in­stance the car will seem­ingly suf­fer from ev­ery con­ceiv­able symp­tom: it may not start, it might cut out, warn­ing lights may flash, the car can lose power, it might back­fire – you name it! The fault is due to cor­ro­sion on the pos­i­tive or neg­a­tive bat­tery ter­mi­nal or both, and it’s worth in­spect­ing for this sort of prob­lem even if you are just ser­vic­ing the car.

There should be a cover over the bat­tery, but in al­most ev­ery case this will have dis­ap­peared, with the re­sult that mois­ture creeps in and pro­motes cor­ro­sion. If this trou­ble is not caught early, the af­fected con­nec­tor/ter­mi­nal will cor­rode to noth­ing and fall apart when touched. The ter­mi­nals are only avail­able from Re­nault deal­ers due to them be­ing spe­cial as­sem­blies that also hold fuses.

An­other point to note is that the bat­tery re­tain­ing clamp can cor­rode, which can prove a night­mare if you’re at­tempt­ing to re­move the bat­tery. On this Re­nault and other mod­els from the firm cor­ro­sion can cause nu­mer­ous prob­lems and these are of­ten in­ter­mit­tent. Ideally, you should try to ob­tain a new bat­tery cover – and a good cov­er­ing of sil­i­cone pro­tec­tant will help avoid any fur­ther prob­lems. Un­for­tu­nately, Re­nault wiring isn’t very strong, so even a tiny amount of wa­ter/mois­ture will cause prob­lems.

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