Resistor for Volvo 4 cyl alternator

[car5car]

I have bought a boat with missing diagram says resistor. Is that what used instead of regulator? And where can I buy it or at least to find out Oms?

 

[bruceb58]

Re: Resistor for Volvo 4 cyl alternator

Your post is confusing. What resistor are you talking about?

There will always be a regulator for your alternator.

 

[car5car]

Re: Resistor for Volvo 4 cyl alternator

Diagram shows resistor on wire from ignition. On alternator I cannot find more then 1 wire connection, it says "bat". I am a car machanic and there is no explaination for that. Battery is connected, ground is going thru bolts and nothing else. It should be.

 

[car5car]

Re: Resistor for Volvo 4 cyl alternator


label on alternator says "Marine SAE J1171"

 

[bruceb58]

Re: Resistor for Volvo 4 cyl alternator

Are you talking about the ballast resistor that drops the voltage to the coil?

Is there a reason you are asking the question? Does the engine not run?

 

[Reel Poor]

Re: Resistor for Volvo 4 cyl alternator

Diagram shows resistor on wire from ignition.

This wire is to reduce voltage to the ignition coil.

On alternator I cannot find more then 1 wire connection, it says "bat". I am a car machanic and there is no explaination for that. Battery is connected, ground is going thru bolts and nothing else. It should be.

There are several marine alternators the are single wire set ups. The only wire that is attached to the alternator is connected to the "Batt Terminal". Most of them look like GM Delco alternators.

 

[car5car]

Re: Resistor for Volvo 4 cyl alternator

Thanks. Where to buy resistor? How to find out which do I need? It was missing when I bought the boat. Wire was just cut. Thanks.

 

[Lyndy]

Re: Resistor for Volvo 4 cyl alternator

Will the Engine fire up if that resistor is missing, damaged or wire cut? I had a 60's Glastron with a resistor similar in description to this. The resistor lead broke while out one day and the Engine quit.

 

[car5car]

Re: Resistor for Volvo 4 cyl alternator

I was told by alternator repair guy that nothing is needed, just hook up battery and bat terminal on alt. Why this kind of alternator doesn't discharge battery when engine is not running?

 

[180shabah]

Re: Resistor for Volvo 4 cyl alternator

Do you have a points style or electronic ignition?

Electronic ignition does not use the resistor.
The older systems only use the resistor to lower voltage so that the points do not burn out rapidly.

 

[SHGOTME]

Re: Resistor for Volvo 4 cyl alternator

There is a resistor...purple wire... The AQ131 Alt. requires Pos., Neg., and a third.....it's purple, runs to the coil. It is needed as is a resistor coil wire to the distributor, the 4cyl. AQ motors produce very high voltage. If you don’t use them you will find yourself broke down after a short run due to an overheated coil. Don't touch it, it's very hot...

 

[jastacey]

Re: Resistor for Volvo 4 cyl alternator

If you have a Valeo/Paris Rhone Alternator, and you don't use a resistor on the D+ or ignition terminial, the engine will still run when the key is turned off, There is a resistor on the D+ terminal or ignition terminal, it produces output voltage just like the battery output terminal. It is attached to a diode trio, which is a miniature rectifier assembly. Since the D+ or ignition terminial on the alternator is connected to the same circuit as the igition coil, voltage is supplied to the ignition coil when the alternator is charging and the key switch has no effect on it.
To elimate this problem a 10 - 50 Ohm resistor is needed to drop the output voltage so the igition coil will not fuction. Installing a indicator lamp in this circuit will also work.
Delco Marine alternators have a resistor built into the plug connector, and Valeo/Paris/Rhone use a a resister, or resistor wire on D+ or 61 terminial

 

[mekaneck]

Re: Resistor for Volvo 4 cyl alternator

I have an Volvo Penta AQ131A, and I have the same resistor on the D+ terminal of my alternator. It measures at 60 ohms, but I don't know if that is OK or not (currently I'm having the alternator rebuilt as it only outputs 10 volts).

Also, I'd like to hook up a battery light to let me know if my alternator is charging or not. I'm assuming I would feed +12v (switched on w/ the ignition) to a light and then ground it out to this purple wire, correct? (I would disconnect the coil completely from this wire). If I'm thinking of this correctly, the D+ terminal will take a +12v signal to turn the alternator on, and when it is charging, it outputs +12v from that same terminal. If the alternator stops working, that terminal will act as a ground. Can someone please confirm this?

Thanks!

 

[mekaneck]

Re: Resistor for Volvo 4 cyl alternator

That's good advice for someone who owns a decent boat, but this is a 1986 Bayliner Capri. When I bought it the electrical system was already a mess, and I've already gone through and sorted most if it out. The next owner of this boat will probably be a trash dump, so I'm not too worried about resale value.

 

[Don S]

Re: Resistor for Volvo 4 cyl alternator

If you have a question, start a new thread. Don't just find a post about it and post at the end of a 2 year old post and expect people to find your question.