Weird dash light after alternator change

Post by **Pushki** » Thu Jul 25, 2013 11:16 pm

One of Ammo's pictures I believe.

Post by **Merlin** » Fri Jul 26, 2013 9:08 am

CAT temp + battery warning lights is the warning that there is a problem with your alternator. I had the exact same when my alternator popped its clogs.

If you can, check the output form the alternator.

Merlin wrote:Unfortunately my battery warning light came on when 3rdGenSteve drove the car last week. Weirdly the CAT temp warning light came on as well even though it is earthed off I made the "fcuk it" decision of going to the track anyway I knew that 4th and 5th gen alternators have different plugs but wasn't sure on the exact swapping procedure, plus I wasn't going to resort to hacking up wires at 7.30 in the morning.

http://www.ludegeneration.co.uk/post13710.html

W1ggz wrote:My cars just broken down driving along and the battery light and cat light came on on the dash then I lost the stereo and speedo but engine was still running parked in BCFC car park and cut out. I'm guessing its the alternator but why is the cat light lit up as well.

http://www.ludegeneration.co.uk/general ... t5602.html

Post by **ddoubledanny** » Fri Jul 26, 2013 9:56 am

Merlin wrote:CAT temp + battery warning lights is the warning that there is a problem with your alternator. I had the exact same when my alternator popped its clogs.

If you can, check the output form the alternator.

Merlin wrote:Unfortunately my battery warning light came on when 3rdGenSteve drove the car last week. Weirdly the CAT temp warning light came on as well even though it is earthed off I made the "fcuk it" decision of going to the track anyway I knew that 4th and 5th gen alternators have different plugs but wasn't sure on the exact swapping procedure, plus I wasn't going to resort to hacking up wires at 7.30 in the morning.

http://www.ludegeneration.co.uk/post13710.html

W1ggz wrote:My cars just broken down driving along and the battery light and cat light came on on the dash then I lost the stereo and speedo but engine was still running parked in BCFC car park and cut out. I'm guessing its the alternator but why is the cat light lit up as well.
http://www.ludegeneration.co.uk/general ... t5602.html

Nice one mate do you know how to test the alternator thanks

Post by **Merlin** » Fri Jul 26, 2013 10:02 am

Run engine at 2,000 rpm with the headlights on high beam and if the terminal voltage is less than 16V, replace the alternator (page 23-126 of the 4th gen service manual).

Post by **ddoubledanny** » Fri Jul 26, 2013 11:23 am

Nice one bud

Post by **Merlin** » Sun Jul 28, 2013 3:29 pm

We tested Vanzep's alternator using the method from the service manual. It gave 14.2V and seems to be charging adequately.

Post by **ddoubledanny** » Sun Jul 28, 2013 7:19 pm

I actually haven't tested it yet but my two dash lights are still on but my volt gauge is still reading 14v I thought I would have lost some voltage from starting it up everyday and using electrics

batkosio · Post by **batkosio** » Sun Jul 28, 2013 8:21 pm

Check the earth mate, the TWC light and battery light share a common one, see this service manual page:

bristol_bb4 · Post by **bristol_bb4** » Wed Jul 31, 2013 9:14 pm

thats odd, just changed my alternator (thanks rob!) and now i have the same two dash lights on?!

Bludge · Post by **Bludge** » Wed Jul 31, 2013 10:21 pm

Cant help with the cat light, but check the letters for each connection on the large plug that connects to the alternator. i swapped mine and it was working and charging fine, but i had the battery light on, i replaced it with another alt from ebay and it was fine, i worked out that the connections are labeled with letters, and they were the wrong way round on the first alt i used.

If that makes sense....lol. its been a long day.