Hi. my dads friends has put another inboard derv engine in his boat and is having alternator wireing probs so here goes the question.

 

from the alternator he has connected the heavy wires to batt live and earth wires correctly now on the back of the alternator is a third wire that goes to a bulb only?? to tell him if its charging but the bulb stays on even thow they know the alternator works fine does any one have a diagram of how it should be wired? ive done a google but im excuse the pun sailing blind as ive never delt with boats or wires before so any input would realy help kind regards cainy :duffer:

A pic of the alternator would be good!-I assume the bulb is wired from a live feed?

hi sorry i dont have a pic i cant even find a wiring diagram on google to email my dad with.The buld is wired to the back of the alternator and comes on so it is live but doesn't go out to say its charging even thow the alt is fine :(

That is orking opposite to a car, usually the light comes on when its not charging. What happens when you disconnect the wire from the alternator, is the light still on or does it go off, when the engine is running.

 

Cheers John Crisp

Cainy

 

send a pic of the alternator and terminals to conceptincar@aol.com and i will do you a diagram

 

John

the wire you described is the ind wire.when the altenator output exceeds the battery voltage the lights ahould go out.is the altenator output in amps enough to supply all the loads,if not then the light will stay on.

cheers for the imput lads :) ZX MAD ill get my dad to take a pic today and email it to me and ill pass it on to you as he lives in the lake district and im in the midlands.agine many thanks for the input!!! :duffer:

cheers for the imput lads :) ZX MAD ill get my dad to take a pic today and email it to me and ill pass it on to you as he lives in the lake district and im in the midlands.Again many thanks for the input!!! :duffer: