Amazon: Electrickery help again

[devilishdesigner]

Jumped in my car tonight and the amp light stayed on. My batteries on it's last legs, but according to my gauges the recently fitted alternators putting out 13-14V, amps are neutral (slight twitch to positive when revved), all lights work, but amp light is on and brightens when the car us revved! Any guesses? I have no idea how it's wired

[Colonel Froth]

Have you read the swem page? http://www.sw-em.com/AMP_Indicator_ON.htm

Have you got a spare battery you can sling in, see if the light goes out?

[Keith Moody]

I had the same problem last week.

Had lights and heaters, so it wasn't the stubby fuse that had blown.

It ended up being my control unit that was faulty... not sure if this helps or not?

Keith

[Ron Kwas]

DD;

I you "have no idea how it's wired", why would you expect us to have any better idea of what your AMP light is connected to and indicating...the parties making the modification need to also supply this kind of information.

CF; Thanks for reference, but that info is not going to help either...as it states, it applies to OE generator system only!

Cheers

[devilishdesigner]

Hi Keith, control unit?

[devilishdesigner]

Well I thought I'd run jumper leads across from one of our more modern cars to see if it was a wiring short. Even with both cars running the light stayed on, and both gauges read well (level amps and about 14v), so it looks like a short to me. Anyone know how the amp light is traditionally wired?

[Keith Moody]

Sorry for the delay, DevilishDesigner - only just seen this!

Right, control unit (or voltage regulator to give it a more common name!) is the little box mounted on the o/s/f wing... mine said Bosch on it.

Ron Kwas has posted this link before http://www.sw-em.com/AMP_Indicator_ON.htm which may help you.

Having thought my problems were solved when I replaced the dyno and voltage regulator, my AMP light is now on and off at roughly 20 min intervals.

The fan belt tension seems fine, so I'm wondering if I've got a faulty battery....

Keith

[Colonel Froth]

Again though it depends entirely on how it's wired. What kind of alternator is on there? If it's a new model it probably has its own regulator and bypasses the control unit. If you read the page after the link, read the haynes, figure out the differences between what should be there and what you have then you stand a better chance of fixing it/getting advice on how to fix it.

[devilishdesigner]

The alt is off a 72ish 144S, with a matched reg, just fitted in the last few months. Had probs with the headlights again yesterday (this time I hit the floor switch for high beams and everything went out), so will rebuild the floor switch when I get back from the UK and see if that helps

[Derek UK]

Don't know where you are just now DD but you could buy a new dip switch in the UK if needed. from Brookhouse. There's not much you can do with regard to rebuilding them.