Wiring Volvo Penta 2001

[kingfisher]

This weekend I'm installing a few electrical goodies, of which one is a Mastervolt battery isolator.
The batteries are 2 VARTA AGM
The isolator has no sense-connection.

Here is what the relevant part of the engine looks like now:

The guy at mastervolt said something about cutting the yellow wire. That's the one going from the alternator to the mystery thingy under the starter motor. What is he talking about?

2. What do I do with the info that the diode has no sense-wire and the subsequent voltage drop?

Does anybody have some "lectrics for dummies advise"? A step-by step guide.

 

[Rustyknight]

The "yellow thingy" is the solenoid for the starter motor (I have a 2001 also, and mine failed once)...... apart from that I can't help as I'm a electrical dummy too.

 

[bendyone]

[ QUOTE ]
The "yellow thingy" is the solenoid for the starter motor (I have a 2001 also, and mine failed once)...... apart from that I can't help as I'm a electrical dummy too.

[/ QUOTE ]

I think you are wrong, The yellow thing is a solenoid for the -VE this isolates the engine from the -VE when not in use. Important for the saildrive leg protection.

 

[chrishelen]

Hi i wired my 2001 in in march and it worked!!!try this site ,t.b. training.co.uk.it helped me.

 

[pvb]

OK, here\'s the explanation...

The "mystery thing" you've identified under the starter motor is an earthing relay. Its purpose is to connect the starter motor to battery negative only during starting - the rest of the time the starter's isolated from battery negative. The reason for this is to help prevent galvanic corrosion.

The earthing relay is usually activated by an orange wire (this may be the one you've marked "Yellow? wire"). Do not cut this wire.

In recent years, Volvo Penta have supplied engines with alternators which have a battery-sensing connection. This allows the alternator to increase its voltage to compensate for the voltage drop in isolator diodes. The battery-sensing connection is a yellow wire. If your alternator has this yellow wire, it should be connected to your domestic battery (as this is the battery most likely to be low and needing charging).

The output from your alternator (likely to be a red wire about 8-10mm diameter) should be connected to the input of the new battery isolator. You may find that this wire is currently connected to the starter motor. Then you need similar diameter wires from the outputs of the battery isolator to the positive terminals of the 2 batteries.

If you're in any doubt, ask a marine electrician to do it for you - it won't cost a fortune and it's better to get it right.

 

[Rustyknight]

Re: OK, here\'s the explanation...

It looks like I stand corrected....... though in defence of my comment, I was thinking back to what was said to me by a Volvo engineer when the part had to be replaced under warranty 10 years ago. /forums/images/graemlins/blush.gif