Replaced alternator now stop and battery lights

[Kieran..]

Hi guys I replaced my alternator on my 172 with air con at the weekend and all looked good all running okay but then realised the stop and battery light is on now

The alternator is second hand from renparts and is the right 110amp.
I have checked the earth earth on it and is nice and tight.
The bolts for alternator are tight.
I've checked the exciter cable and plug and in the plug the yellow part did pop out when removing old alternator but pushed back in and looked fine. Could anyone get a photo of inside their plug?

I will be testing the voltage shortly as need new battery for volt meter

Running out of ideas and getting frustrated

 

[JamesBryan]

See what voltage you're getting when running, then go from there.

If it's anything less than 14v+, it's no good.

 

[Kieran..]

Just tested

Battery 11.96 car off

Running 11.51

Exciter cable 10.49

 

[JamesBryan]

Not right that.

Is that across the battery terminals?

 

[Kieran..]

I found these wires looking a bit suspicious, anyone k ow what these wires do or are for and if it could effect charging

 

[Kieran..]

Not right that.

Is that across the battery terminals?

Yeaa that's on the battery terminals

 

[JamesBryan]

I found these wires looking a bit suspicious, anyone k ow what these wires do or are for and if it could effect charging

Not sure on the yellow fuse box ones, but it's not an ideal repair.

The one on that grey plug is the power steering pressure sensor.

 

[Kieran..]

I'm going to repair that wire better but I ca t see that being the issue so still no clue what it could be

 

[Coops Mk1]

Sounds like duff alternator tbh, measure voltage from main wiring anchor on the alternator to battery neg, if that's still low then unlikely to be wiring.

 

[Kieran..]

Sounds like duff alternator tbh, measure voltage from main wiring anchor on the alternator to battery neg, if that's still low then unlikely to be wiring.

I'm assuming you mean the big red one that bolts to it?

 

[Coops Mk1]

I'm assuming you mean the big red one that bolts to it?

 

[Kieran..]

Sounds like duff alternator tbh, measure voltage from main wiring anchor on the alternator to battery neg, if that's still low then unlikely to be wiring.

Checked voltage and is still 11.48. Starting to think it is a dodgy alternator.

Also I have noticed my petrol light is intermittent weather it comes up or not, the car as same amount in it for a while as it's not moved for ages and the needle is clearly very low