Fluctuating volt .meter

Moderators: scimjim, Lukeyboy46, erikscimitardemon, Roger Pennington, philhoward

Post Reply
User avatar
Pommy
RSSOC Member
Posts: 163
Joined: Wed Feb 15, 2012 9:26 pm
Location: Preston, Lancashire
Has thanked: 61 times
Been thanked: 1 time

Fluctuating volt .meter

Post by Pommy » Sun Feb 24, 2019 10:29 pm

Please bear with me if this gets very untechnical... After being quite a reliable starter it became a bit difficult to start, the ignition light went half out when running, dimmed further as revs increased, sometimes it went out as it should. The volt meter slowly rose to 15 then slowly dropped back to 12, then up and down again, engine revs did seem to have an effect and volts drop when all lights are turned on, during this the ignition light was virtually out but not quite. I've tested the battery, not running 12.4v, running 13.58v. I've checked the alternator multi plug, cleaned the contacts etc. Checked the wiring as far as I can, can't see any obvious damage, checked and cleaned the regulator connectors, other than that the Car runs well.
Thanks in advance Pommy


Pommy
1973 Se5a Auto

User avatar
scimjim
RSSOC Member
Posts: 37042
Joined: Sun Oct 01, 2006 10:08 pm
Location: Gloucester
Has thanked: 122 times
Been thanked: 908 times

Fluctuating volt .meter

Post by scimjim » Sun Feb 24, 2019 10:41 pm

Alternator regulator pack.


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

User avatar
Pommy
RSSOC Member
Posts: 163
Joined: Wed Feb 15, 2012 9:26 pm
Location: Preston, Lancashire
Has thanked: 61 times
Been thanked: 1 time

Fluctuating volt .meter

Post by Pommy » Mon Feb 25, 2019 8:39 pm

Thanks Jim, the alternator has been on the car for many years, would it be more cost effective to replace rather than repair, maybe upgrade to a higher power unit, which would you recommend. Pommy


Pommy
1973 Se5a Auto

User avatar
scimjim
RSSOC Member
Posts: 37042
Joined: Sun Oct 01, 2006 10:08 pm
Location: Gloucester
Has thanked: 122 times
Been thanked: 908 times

Fluctuating volt .meter

Post by scimjim » Mon Feb 25, 2019 8:46 pm

If it’s the original ACR type, I’d probably upgrade it and switch to an A127 type which has easily replaceable brush and regulator pack on the back.
B98A11DC-A9E9-4C22-AB31-FD79A46CA6C0.jpeg
B98A11DC-A9E9-4C22-AB31-FD79A46CA6C0.jpeg (35.53 KiB) Viewed 673 times


Jim King

SECURE DRY STORAGE FOR YOUR SCIMITAR

Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
Chief mechanic for: 1400 K series SS1 (Megan3), 1400 CVH EFi SS1 (Grawpy), 1300 SS1 (Number One) & Sarah's coupe.
CURE THE FAULT - NOT THE SYMPTOMS

User avatar
ScimiTom
RSSOC Member
Posts: 573
Joined: Fri Feb 04, 2011 10:07 pm
Location: Houston, Scotland
Been thanked: 12 times

Fluctuating volt .meter

Post by ScimiTom » Mon Feb 25, 2019 8:55 pm

Pommy, I reckon our cars must be sending each other signals, as mine seems to suffer the same issues at the same time as yours. It was the same with the cutting out when warm, and now with the dodgy ignition light!

For what it's worth, I've got an uprated 50amp 17ACR alternator on its way - decided just to simply replace rather than faff about trying to find the dodgy part.

Hope you get to the bottom of it.

Tom


Current: 'Boffin' (1971 SE5a)
Previous: 'Sunshine' (1980 SE6b)

User avatar
Pommy
RSSOC Member
Posts: 163
Joined: Wed Feb 15, 2012 9:26 pm
Location: Preston, Lancashire
Has thanked: 61 times
Been thanked: 1 time

Fluctuating volt .meter

Post by Pommy » Tue Feb 26, 2019 9:58 am

Many thanks everyone, your advice taken, new A127 70a on its way...Pommy


Pommy
1973 Se5a Auto

Post Reply

Return to “Se5/5a”