US / North America

Tachometer installation -

I have a Leece Neville, 8LHA2070VB alternator. I just bought a tachometer that requires either an R, AC, or W connection. Where do I hook up the wire to? One of the 3 AC poles? Also how many poles does this alternator have? Thanks

tachometer 12HT 4A replacement

I need to replace a Motorola tachometer model # 12HT4A and like to know what to replace it with. It is from a boat with a westerbeke diesel engine and the tach is driven by a wire from the alternator.

Thank you,
Bill Randall

Is there a self-excited direct replacement for your 8SC3009ZA alternator?

We are an OEM of railroad equipment. We use a lot of 8SC3009ZA alternators. The excite wire is just an annoying extra connection for us.

Is there a self-excited direct replacement for your 8SC3009ZA alternator?

Andrew C. ( Drew ) Miller II | Electrical Engineer
Harsco Rail
2401 Edmund Road
West Columbia, South Carolina 29171


I have a prestolite alternator in my boat. It is on an 1991 OMC 4.3L v-6. The OMC part number is 985466. I have not been able to find a replacement for the alternator. Can you tell me what alternator is on the engine. Unfortunattly the label is not readable on the alternator.

Receiving notifications of new forum messages

Hello all

If you're receiving this message you have been designated by me as one of the lucky few within Prestolite to be included in the official re-launch of the support forum at [lucky you!].

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Battery drain with engine shutdown

I had my 200Amp Leece Neville Duvac alternator rebuilt after it failed. After installation it charges just fine but I found that the alternator is warm even after the engine has been shut down for an extend time. In fact it run my batteries down before I realized what was happening.
I took it to a service center and they indicated that the Duvac wire was hot even with the key switch turned off. What could be causing this? Is there a relay or some switching circuit that could cause this?

Cross Reference

One of my customers needs a 24V alternator. He has a Volvo part number---9021429786.
What Leece-Neville alternator do I need for him?

Marine 90 amp alternator upgrade for 1998 Indmar 5.7L Moomba Boomerang

I want to upgrade the original 51 amp Prestolite marine alternator (part no. 8MR2084K, sales no. 110-494, Indmar part no. 775024) in a 1998 Moomba Boomerang, Indmar 5.7L gas engine, to a 90 amp Prestolite alternator. It looks like 3 different models may work: 8MR2069TA, 110-602; 8MR2033TS, 110-252; and 8MR2030TC, 110-570. Which do you recommend? Thanks, Bill

Balmar/Prestolite MC-614-AGM regulator

I have a Leece Neville 110-555, 160 amp alternator and a Balmar/Prestolite MC-614-AGM regulator. A 3.5 hp air cooled diesel drives the alternator at about 4500 rpm for charging batteries at camp. While I do not have the real manual the options are similar to the standard Balmar 614. The engine is easily overloaded at full field on the alternator. I’ve set the belt load manager to 7, its lowest setting. The unit seems to works correctly except for the engine being overloaded when I put a big load on the batteries. I then shorted the alternator temp sensor, which reduces the field to 50%. I can still overload the engine. The engine starts to smoke at around 50 amps/750 watts and falls flat on its face at 75 amps/1000 watts. Those #s don’t include other associated losses in the system so I could add around 30% to them. Is there any way to further reduce alternator output? I’m about to put a variac on the field wire and vary it that way. Any help would be appreciated and a link to the real manual would be great.

Thanks, Geno

10 hours later.

I think answered my own question. I put the variac on the field wire and could easily keep the engine from overloading with 1500 watts load on the inverter. The battery voltage dropped steadily but picked right up when I took the load off and the batteries began charging properly. It looks like 3 ohms is the magic #. I found a 10 ohm, 100 watt variable resistor on ebay and I'll put that in and and set it at the sweet spot. What this means to me, which is very important, it that I can use this small engine to run large loads for short times. I can put a table saw, compressor or small well pump on the inverter and do so with a fuel efficient engine running at a tolerable 2400 rpm.

It would still be nice to know if there's a way to do this without the resistor so don't hesitate to chime in with any ideas.

Thanks, Geno

Alternator needs 12V to start


I have 8MR2070TA connected to a Sterling Products AB12130 Alternator to Battery charger. There is no output from the alternator in this configuration. The alternator works properly when connected directly to the battery. Does the alternator need 12V on its output before it will start?