can't Identify relays / fuses 79 B : MGB & GT Forum : The MG Experience

can't Identify relays / fuses 79 B #1
219 bob wroe elizabeth city, NC, USA Sign in to contact	Topic Creator (OP) Mar 31, 2015 07:36 PM Joined 13 years ago 281 Posts

This part of my post lost gauges,

Can't Identify this relay in front of the fire wall just before the fuse box,

looks exactly like the relay for the ignition on front of the fuse box..exactly the same model?

There is a Purple wire not connected? Must go somewhere?

Tks

Lori Ann

IMG_0661.JPG 37.5 KB

IMG_0658.JPG 43.7 KB

Sign In or Register to view this photo

IMG_0662.JPG 52.2 KB

Sign In or Register to view this photo

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #2
chris Chris Roop (RIP) Pendleton, OR, USA Sign in to contact	Mar 31, 2015 07:39 PM Top Contributor Joined 25 years ago 43,805 Posts

For a 79, you should have two; one is the starter relay and the other is the ignition relay.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #3
mowog1 Rick Ingram Saint Joseph, IL, USA Sign in to contact 1952 MG TD "Nigel" 1969 MG MGC "Vicky" 1972 MG MGB "Mallard" 1974 MG MGB GT V8 Conversion "The V8" & more	Mar 31, 2015 07:43 PM Top Contributor Joined 19 years ago 28,203 Posts

In reply to # 2953481 by chris For a 79, you should have two; one is the starter relay and the other is the ignition relay.

The ignition relay is the one closest to the radiator. The starter relay closer to the fuse block. Both are located on the RH inner fender.

1952 MGTD - 1969 MGC - 1972 MGB - 1974&1/2 MGB/GT V8 conversion - 1978 MGB

mowog1@aol.com

Pieces Of Eight: Struts For Your MG www.mgstruts.com

Pieces of Eight! has provided gas-charged bonnet & bootlid strut kits for the MGB/MGC and hatch kits for the MGB/GT-MGC/GT since 1996. We have recently added MG Midget bonnet and bootlid kits to inventory. Contact Rick at: mowog1@aol.com

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #4
219 bob wroe elizabeth city, NC, USA Sign in to contact	Topic Creator (OP) Apr 1, 2015 01:59 AM Joined 13 years ago 281 Posts

Why do I have a PURPLE wire here?

Seems to need to be connected to something?

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #5
MG-Maxx Charles Waugh West Haven, CT, USA Sign in to contact 1971 MG MGB GT V6 Conversion 1974 MG MGB GT V6 Conversion "Gambler MG" 1979 MG MGB MkIII "Rumpelstiltskin" 2008 Chevrolet HHR	Apr 1, 2015 03:46 AM Joined 13 years ago 1,364 Posts

There will be some wires not connected under the bonnet, since most cars have had the Air pump and other emission equipment removed..

It shouldn't have anything to do with your gauge issue. Gauges are powered by the green wires.

Keep on target.. fix current issue, then come back an look at this if you want.. Purple powers courtsey lights,clock, horn.

Chuck
Hamden, CT

79 MGB - Rumpelstiltskin
Just awakened after a 10 year slumber.
GM 60V6 Gen 3 - 3.5L EFI V6 T-5.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #6
riley1489 Bruce H Great White North, QC, Canada Sign in to contact 1953 Jaguar XK120 1959 Riley 1.5 "King George" 1973 MG MGB	Apr 1, 2015 06:36 AM Top Contributor Joined 12 years ago 26,297 Posts

Caution,
Purple wire is always LIVE, fused but live.

If it were to find an earth a fuse will pop!

B

Life's most persistent and urgent question is, "What are you doing for others?"

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #7
219 bob wroe elizabeth city, NC, USA Sign in to contact	Topic Creator (OP) Apr 1, 2015 06:55 AM Joined 13 years ago 281 Posts

Bruce,

Ok, Live...What would the purple connect to? Lori Ann

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #8
lewisrn Bob L Danville, IN, USA Sign in to contact 1980 MG MGB "The "B"	Apr 1, 2015 06:57 AM Top Contributor Joined 13 years ago 13,194 Posts

Here is a link for easy to read MG wiring diagrams. Scroll down to the next to the last one, which is for your car.

http://www.advanceautowire.com/mgb.pdf

As you can see the purple wires feed several different components. If you're curious enough, check all of those components to see if they work. If one of them doesn't, then that's what that wire hooks up to.

“Ideological certainty easily degenerates into an insistence upon ignorance". Daniel Patrick Moynihan

In any debate, the side which strays from civil discussion is usually the side that lacks confidence in its debate position or in the merit of their arguments. Making personal attacks on the opponents instead of staying on the subject is also a sign of weakness.

Anyone who feels compelled to respond in kind to any perceived slight is often suffering from narcissism.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #9
219 bob wroe elizabeth city, NC, USA Sign in to contact	Topic Creator (OP) Apr 1, 2015 07:03 AM Joined 13 years ago 281 Posts

Why is PURPLE wire not connected or covered? if it is HOT?

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #10
chris Chris Roop (RIP) Pendleton, OR, USA Sign in to contact	Apr 1, 2015 10:02 AM Top Contributor Joined 25 years ago 43,805 Posts

I'm not seeing a purple wire there; grey and grey/yellow that is folded and taped went to the anti-run on valve. There is a brown/purple. Is that what you mean?

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #11
Nicecar Gary (ex "Harv") G Victoria, BC, Canada Sign in to contact 1980 MG MGB "Red On Red On Red"	Apr 1, 2015 10:12 AM Joined 13 years ago 8,390 Posts

"Why is PURPLE wire not connected or covered? if it is HOT?"
DPO

Looking at schematic, most likely it's the door switch or seat belt that got disconnected.

Just conjecture.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #12
lewisrn Bob L Danville, IN, USA Sign in to contact 1980 MG MGB "The "B"	Apr 1, 2015 10:59 AM Top Contributor Joined 13 years ago 13,194 Posts

In reply to # 2953734 by 219 Why is PURPLE wire not connected or covered? if it is HOT?

Essentially it is covered. Something would have to stick up inside that plastic connector to touch anything hot. Not much risk to just leave it alone.

“Ideological certainty easily degenerates into an insistence upon ignorance". Daniel Patrick Moynihan

In any debate, the side which strays from civil discussion is usually the side that lacks confidence in its debate position or in the merit of their arguments. Making personal attacks on the opponents instead of staying on the subject is also a sign of weakness.

Anyone who feels compelled to respond in kind to any perceived slight is often suffering from narcissism.

Reply

Was this post helpful or interesting?

Yes No Thank

Re: can't Identify relays / fuses 79 B #13
MG-Maxx Charles Waugh West Haven, CT, USA Sign in to contact 1971 MG MGB GT V6 Conversion 1974 MG MGB GT V6 Conversion "Gambler MG" 1979 MG MGB MkIII "Rumpelstiltskin" 2008 Chevrolet HHR	Apr 1, 2015 11:09 AM Joined 13 years ago 1,364 Posts

I have my wire harness opened. The only purple wires go through. There is a brown wire that is not connected to anything by that relay. Could it be that? It also is always hot so cover and continue.

As others have stated, check if anything on the purple loop is not working. If all is OK, then cap off and leave it to the MG wiring gods...

Chuck
Hamden, CT

79 MGB - Rumpelstiltskin
Just awakened after a 10 year slumber.
GM 60V6 Gen 3 - 3.5L EFI V6 T-5.

Reply

Was this post helpful or interesting?

Yes No Thank

MGB & GT Forum

can't Identify relays / fuses 79 B

To reply or ask your own question:Members Sign InorCreate an AccountRegistration is FREE and takes less than a minute

To reply or ask your own question:

or

Registration is FREE and takes less than a minute