[DeTomaso] Not Starting-Check Battery

[Joseph F. Byrd, Jr.]

Attached schematic

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf Of jgkrenton at comcast.net
Sent: Wednesday, July 26, 2017 10:39 AM
To: Thomas Törnblom; David Jenkins
Cc: detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] Not Starting-Check Battery

Thomas, David et-al: 

The alternator indicator light on a stock wired Pantera is also part of the "Voltage Sense" circuit that helps the alternator start when the engine is started. If the bulb burns out the sense line doesn't work and the alternator may or may not start depending on the characteristics of that particular alternator. (You may have seen alternators that wouldn't start until the engine was rev'd a bit. Some won't start at all without a sense line connected.) 

The DeTomaso factory included a big ceramic resistor (something like 10 ohms or something, I need to check the schematic) across the light bulb. This resistor is there to ensure the alternator gets a strong start signal and will still start if the bulb fails. Of course if the wire breaks, there is still an issue. 

I suspect many of these resistors have disappeared over the years. If you are having problems with an alternator that doesn't want to start charging, you might want to ensure the resistor is installed and functioning. 

FYI 

Jeff 2467 

----- Original Message -----

From: "Thomas Törnblom" <tipo874 at gmail.com>
To: "David Jenkins" <djenkins at vanguardtrailer.com>
Cc: detomaso at server.detomasolist.com
Sent: Monday, July 24, 2017 12:04:02 PM
Subject: Re: [DeTomaso] Not Starting-Check Battery 

It can also be the bulb, or the wire from the bulb to the alternator/regulator. The wire broke for me in flight in Germany many years ago and as long as the alternator was spinning it was ok. The morning after it would not start charging. After crimping on a new connector it was ok again. 

Thomas 

> 24 juli 2017 kl. 15:44 skrev David Jenkins <djenkins at vanguardtrailer.com>: 
> 
> [cid:image001.gif at 01D3045F.FE026390]
> 
> 
> Most of the Pantera owners on this site probably know this but I am 
> only modestly mechanically inclined. I went to start and instead had a 
> loud clicking noise. My first thought was a bad starter relay but I 
> had enough sense to check the battery which tested at 11.4V. The parts 
> store manager told me the battery usually needs to be fully charged 
> for the relay to engaged. Turns out he was right. I charged the 
> battery and it started fine. Since my generator light was not coming 
> on I now assume I need a new voltage regulator.
> 
> 
> 
> DJ
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