Fusible Link to Voltage regulator?

[fjatheart]

I've got a loose wire that is keep my 1980 FJ40 from charging. The end the fusible link attached to the end of the voltage regulator has come off on one end. The end that is attached goes to a black wire and to a white wire w/ a blue stripe. So where is the loose end of fusible link attached to?

Im not so great at reading the wiring guide in the FSM.

Thoughts, experience?

Thanks!

 

[Pin_Head]

Later (81 up) cruisers have a fusible link in the main (white/blue stripe) power wire for the alternator. This wire goes from the B+ lug of the alternator to the battery +.

Not sure about 80, but I don't see a reason why the voltage regulator would have one (even if you have an external voltage regulator).

 

[bsmith123]

wire

hope this helps

here are the color codes from coolerman
Fj40 Wiring Codes

 

[fjatheart]

Currently I've got the white/blue wire coming off the B post on the alternator and going directly to the battery. The fusible link coming off the ammeter is just hanging there not attached. Should I just run the fusible link directly to the B terminal and leave the other white/blue wire already attached between the B terminal and + terminal?

When I tried this earlier the voltage went up and down randomly, so I assume this is not correct.

Help BSmith!?

 

[Pin_Head]

On your truck, the fusible link joins the white blue wire from the alternator and the large white wire that is the main power feed on one end of the link the battery + on the other end of the link. If the white wire and fusible link is disconnected, there must be some other wire supplying power and this wire should have a fusible link to prevent it from burning up in the case of a short.

Pictures might help if they clearly show the color code.

 

[fjatheart]

Pictures

Here are two pictures. One is the white/blue going to the battery and the other is the fusible link coming off the ammeter.

 

[Pin_Head]

In the top picture, the white plug has a wire that is attached to the battery which the white/blue wire plugs in to. That appears to be the remnants of the OEM fusible link. The battery + post connection is substandard and prone to failure.

What you are holding in your hand is the plug for the amp meter wires. One wire used to go to one end of the OEM fusible link and the other wire went to the other end. Both wires appear to be connected to some kind of non standard fusible link. It cannot be OEM because of the spade terminal on one end. I can't imagine what this is good for, other than leaving it disconnected because the PO didn't want the amp meter to work.

 

[fjatheart]

I just installed a fusible link between the B post on the alternator and the + on the battery. I assume this is correct??

As far as the Ammeter goes. There is a fusible link between the White/blue side of the ammeter wire and the battery and the black wire from the Ammeter is grounded. Is this correct?

I put the meter on the B post and the voltage is down to 2.00 then back up to 13.00 and all in between. Does this mean the alternator is bad?

Thanks again!

 

[Pin_Head]

It can't hurt to have a fusible link between the alternator and the battery as toyota did this on 81 and later cruisers.

My guess is that the PO thought the amp meter was a volt meter and tried to wire it up as if it was a volt meter. This would put a dead short on the meter and blow the fuses in the black plastic box in the bottim picture.

I don't understand what you mean by the voltage is up and down. If the voltage at the B+ lug of the alternator varies that much with the engine running, then maybe the brushes are going out.

 

[fjatheart]

The 5 amp fuses are good in the little black box. Does the fusible link connect both the wires coming out of the black box together and then to the battery?

The alternator is a replacement Toyota and yes the voltage is up and down on my meter. The alt is about a year old.

 

[Pin_Head]

The amp meter is wired in series with the OEM fusible link (eg one wire attaches to each end of the link).

If the alternator is new, it may be a bad voltage regulator if you have an externally regulated alternator or the alternator is bad if it is internally regulated.

 

[fjatheart]

The external regulator is less than a year old as well. I will try my old one and see if anything changes.

In regards to the amp meter. The black and white/blue wires just attach to each end of the fusible link and that is it? The fusible link doesn't attach anywhere else?

Thanks Pin Head for your patience and knowledge.

 

[Pin_Head]

One end of the fusible link also connects to the battery and the other end connects to the large diameter white and white and blue wires. This is clearly shown in the schematic diagram above.


The meter measures the current flowing in the fusible link to and from the battery.