VESPA LX 50 Specifications download pdf (Page 71)

which may cause a short circuit to ground (thus

preventing damaging the regulator).

Afterwards measure the resistance between con-

tact 3 (Orange) and contact 2 (Black) of the voltage

regulator (with connector disconnected)

If the value measured is far from that indicated,

replace the regulator because it is in short circuit.

b) Battery fails to recharge (regulator interrupted).

To check if there is any failure in the voltage reg-

ulator recharge section, first connect 2 testers to

the battery (one to detect voltage and the other to

detect current) as indicated in the second figure

and follow the procedure below:

Start the engine (temporarily connect the red cable

to the battery positive terminal in order to avoid

damaging the device that measures current).

Check that there is a 13V voltage minimum (bat-

tery charged) and a recharge current of 1.5 ÷ 2A

with the lighting system but the starter disabled. To

disable the lighting system, remove the light re-

mote control.

As the engine rpm increases, so do the current and

the recharge voltage; with rpm over 4000 there

must be a recharge current of about 4.5A; enabling

both the lighting system and the starter, the stop

light and if the horn is powered, current values ≥

5A and a voltage value of 14 ÷ 14.5V ( regulator

threshold voltage) can be found.

If values other than those above are detected,

replace the regulator; contrariwise, check the

cable harness and the connections.

Electric characteristic

Voltage regulator resistance

~ 8 MΩ

Vespa LX 50 4valvole Electrical system

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VESPA LX 50 Specifications Page 71