[TR] (no subject)

[Alex & Janet Thomson]

Don't forget that there may be a resistance wire in the feed circuit to the coil which limits voltage and available current. I found out the hard way when We had a Pertronix ignition set-up being fed by the coil wire. That low voltage starved the Pertronix unit twice before I realized what the issue was.

Alex Thomson

-----Original Message-----
From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of Randy and Valerie DeRuiter
Sent: Sunday, April 9, 2023 5:31 PM
To: Brad Kahler
Cc: Triumphs
Subject: Re: [TR] (no subject)

Brad

I did a similar conversion a few years ago on a TR3 and I’m fairly certain that needs to be switched power to the unit.  I don’t have a wiring diagram handy but you may be ok adding the small brown wire to the same terminal as the large brown wire - and run a separate connection for the switch power.  The positive coil terminal could be a convenient place.

Randy

Sent from my iPad

> On Apr 9, 2023, at 1:19 PM, Brad Kahler <bkahler1 at gmail.com> wrote:
> 
> 
> I'm trying to troubleshoot a problem with the new wiring in my TR6.  Here's the configuration:
> 
> 1) Mini Denso 70 amp alternator 3-wire 
> 2) New wiring harness from TRF
> 3) Positive cable connected to battery
> 4) Between negative cable and ground I have a fuse inserted with a small amp meter (this way if a short occurs while testing the fuse will blow before damaging anything and I can read the current draw if/until the fuse blows)
> 5) White wire at distributor disconnected
> 6) No dash instruments connected
> 7) Rear harness not installed yet
> 8) TBI power connector not connected
> 9) Harness in engine compartment mostly connected 
> 10) Alternator connected
> 11) Fuse between brown and purple wires is NOT in place
> 
> 
> When I connect the ground I immediately start showing a 4 amp draw.  When I disconnect the small brown wire on the alternator the current draw disappears. 
> 
> The wires area connected as follows.  The brown/yellow wire goes to the (1) connector on the alternator for dash light.  
> 
> The small solid brown wire goes to the (2) connector on the alternator called "switched live" from the battery.  Currently the small brown wire is always live from the battery per Triumph design.  If the "switched live' note means the brown wire is supposed to be cold when the ignition switch is off then that is likely the problem.  
> 
> All of this tells me the brown wire needs to be from the ignition switch on position and only live when the ignition is on.  I don't have any way to really test my theory because I haven't got the engine running yet and won't for a few weeks.  I'd like to resolve this before I go much further with the wiring install.
> 
> Thanks,
> 
> Brad
> 
> 
> 
> 
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