Alternator blown?

[BunnyPlanet169]

Old diode combiners lost at least 0.7v, newer Shottky diode combiners less, but still at least 0.15v. I can't find a good number for a MOSFET SSR, it really depends on the manufacturer.... I was expecting < 0.1, but now I'm curious.

Not to draw you in Neil , but to close the loop. I learned something today:

I always figured from the packaging and voltage sensing application notes that the Blue Sea ACR was entirely solid state, and I learned that's wrong. It's mechanical contacts, ignition proof, and the voltage drop should be zero across the 7610 ACR.

[joe_db]

I have experimented turning the emergency parallel switch on and off and there is no change from the voltages when the ACR combines.

[ndutton]

Joe & Jeff,
I've heard that before - some ACR's and/or combiners have less of a voltage hit than others but still, for the user-owner who is not an electrical professional trying to troubleshoot a problem, these automated devices complicate matters exponentially.

Simon,
14.8 volts?? Man, that's aggressive! Here's one more for good measure:

[marginal]

Yeah....it's adjustable, so I might turn the wick down a little.
The guy at the shop looked up the original one, and said it was spec'd at 15V.
I talked him down a bit.

In the boat it runs closer to 14.5 (lower rpm?) until the ACR clicks in, then drops to about 13.8 due to the depleted house battery I think. I'll keep an eye on it over the next few trips as the batteries charge up.

Simon

[joe_db]

Mine has an off switch
Definitely turn the voltage down. 14.8 is a tad bit high. I worked on a boat with a generator that put out that much and the owner was forever buying new start batteries for it.

Joe & Jeff,
I've heard that before - some ACR's and/or combiners have less of a voltage hit than others but still, for the user-owner who is not an electrical professional trying to troubleshoot a problem, these automated devices complicate matters exponentially.

Simon,
14.8 volts?? Man, that's aggressive! Here's one more for good measure:

[ndutton]

Simon,
Points or electronic ignition? This question looms large now.

[marginal]

I'll admit I've never taken the distributor cap off since I've owned the boat, but points I think. Got several old sets, and condensers, in the spare tub.

[Roadking Larry]

I've got 2 spare sets of points, 1 still new in the box, the old set is stuffed in the box the electronic ignition parts came in.
😆

[marginal]

Point taken.
There is no external evidence of electronic ignition.
Do any of the systems available fit wholly within the distributor?

I suppose I could whip the cap off, but it runs like a top right now, so I'm disinclined to mess with it

Thanks
Simon

[BunnyPlanet169]

A quick visual check: I believe old style points should only have one black wire entering the distributor, the electronic version from MMI will have two (red and black).