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#1 |
Registered User
Join Date: Apr 2009
Location: Rochester, NY
Posts: 1,458
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Best wiring solution 70 Blazer
Ok, so I bought my blazer in a partially restored state. The motor runs, transmission works, will drive itself. Only thing is the wiring is cobbled up right now.
My factory harness is there, but the PO added an HEI distributor to it, and muddled up the rest of the wiring. Right now to run it, i have to attach the HEI power to the batter post, then the electric fuel pump, then turn it over with a timing trigger. Not ideal in the least. I am looking at the possibility of just getting completely new wiring for it, and was wondering what would be the best place to look. I see the Painless kit isn't too bad, and someone else on here suggested M&H(?) If I do re-wire it completely, I'd like it to be wired for the HEI. The electric fuel pump will be replaced by the mechanical one once the new gas tank and lines come in. On the other hand, I may consider trying to work out the wiring, but unfortunately i don't have the wiring schematic to even know where to begin. I received a spare engine wiring harness with the truck, and I believe another dash harness or headlight harness. And help in this area will be greatly appretiated. I'd like to get it running from the key to make it easier to move around. |
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#2 |
Project Junkie! Fishing Poor!!
![]() Join Date: Dec 1999
Location: Olympia,Wa. 98512
Posts: 10,770
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Re: Best wiring solution 70 Blazer
I would go with the M&H, and not just because we sell them. I just finnished a complete wiring install on a 72 Blazer and the entire job went smooth as a babie's hiney. Nothng worked on the Blazer when it came in, but now everything works as it should and my customer won't have to worry about the wiring for 40 more years. WES
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On-line catolog Classic Heartbeat Pickup Parts WEHEPP@comcast.net Call us Toll Free (888) 338-2502 Like Us on Facebook No appointment necessary. 72 BB Chevy Custom Deluxe / Custom Camper 67 I-6 (Soon to be 5.7 LS1) Panel 68 BB Chevy Short Bed 72 6.0 LQ9 Short Bed Chevy 4X4 Olympia's fastest growing truck parts supplier. Olympia's home for Wayward Chevys |
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#3 |
Senior Member
![]() Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,518
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Re: Best wiring solution 70 Blazer
Gotta agree with Wes, I just did my wiring with M&H, and everything was plug and play. They modified mine to run an HEI and electric choke, all connections were factory ones. The engine harness is about 100.00, but be careful when you take it apart at the firewall/fuseblock connection. You can break it, if you don't take it apart right...
The headlite harness is about 300.00, mine was modified with the high/low beam relays. Here again, everything was plug and play, with factory connections. Quality stuff, and the guys there will answer all your questions. If you go this route, check the locations of the wires between the old and new harness just to be sure that no mistakes were made.
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Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 04-14-2009 at 09:04 PM. |
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#4 |
sharp as a marble
![]() Join Date: Jan 2007
Location: atlantic beach,florida
Posts: 1,082
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Re: Best wiring solution 70 Blazer
times 3. used M&H in my 67 Chevelle. Hit the key and started right up. NEVER had a problem with the wiring in that car.
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#5 |
Registered User
Join Date: Apr 2009
Location: Rochester, NY
Posts: 1,458
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Re: Best wiring solution 70 Blazer
I do like the ideas of not having to worry about will it work, my issue comes down to cost, seeing as my build is really a budget build (only being funded by stuff I already own that i sell.) I am really trying to figure out the best bang for my buck.
Obviously the cheapest route is to try and re-use the original harnesses all together. This is attractive cost wise, but increases time to finish. At the same time, if I could re-wire the whole thing, it would be better in the long run as I would not have to worry about anything. I am currently looking to keep some old and some new as my best option. I would probably be replacing my engine, headlight and tail light harnesses, and keeping the dash harness. Even with this solution, this brings up another question. The cost of doing just those three will put me near the $350-400 mark. In that same price range is the complete kit from Painless Wiring, which includes the dash stuff. Just trying to figure out all my options. I have a second hacked up engine and headlight harness, and I believe a second tail light harness as well that I can look into. I also need to dee if my dash harness was hacked up at all still to make sure it can still be used.\ Thanks for all the help so far. |
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#6 |
Active Member
Join Date: Jun 2005
Location: Idaho
Posts: 263
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Re: Best wiring solution 70 Blazer
I've used Painless 18 circuit kits and had no problems whatsoever, wires are labeled on the jacket what circuit your working on, quality was not a problem. I'd recommend Painless as well, comes down to a preference thing for me. I've never done an M&H kit but bet their as good as the other guys are saying.
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#7 |
Registered User
Join Date: Jan 2008
Location: PENDLETON,INDIANA
Posts: 271
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Re: Best wiring solution 70 Blazer
I am budget minded
find a similar equipped truck or blazer /burb and find out how much a junkyard find would be take it apart yourself clean and sand all connections and grease up and work it out with out cobbled fried stuff stock old could be done nicely depending on install usually bad connections fry wiring imho but if you can get the cash new would be the best but pricey |
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#8 |
Registered User
Join Date: Apr 2009
Location: Rochester, NY
Posts: 1,458
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Re: Best wiring solution 70 Blazer
Yeah, i am exploring options. The company I work for makes their own harnesses for our projects, so I might be able to have a harness made up here if I can find the ends that I need.
Does anyone know where those could be found?
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1970 Blazer 350/SM465/205 SOLD! | 1998 Z3 |
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#9 |
Registered User
Join Date: Mar 2008
Location: Oklahoma city
Posts: 490
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Re: Best wiring solution 70 Blazer
napa had boxes of them but none of the ones for tha control column.
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#10 |
Registered User
![]() Join Date: Dec 2008
Location: K.C. Missouri
Posts: 1,024
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Re: Best wiring solution 70 Blazer
http://www.ezwiring.com/wiring_harness.html
This is what I am looking at? They are affiliated with Dolphin Guages, I have heard good things, and the mony is right, I put M&H in my SS Chevelle, but I spared no expense on that...Good but not cheap. |
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#11 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: Best wiring solution 70 Blazer
Search NAPA for Part numbers 725147 (female) and 725145 (male) wire terminals. If the plastic they slide into is still good, all you need is a handful of each of the above, some new wire, and keep the $300 - $1000 you save on these full wiring kits for something a lot more fun than wiring.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#12 |
Registered User
Join Date: Apr 2009
Location: Rochester, NY
Posts: 1,458
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Re: Best wiring solution 70 Blazer
got a couple of the connectors from Napa. Also snagged some wiring harnesses out of a 66 impala and a 65 corvair for the connectors. Still no HEI connector, but I'm still looking.
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1970 Blazer 350/SM465/205 SOLD! | 1998 Z3 |
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#13 |
Senior Member
![]() Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,286
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Re: Best wiring solution 70 Blazer
Ron Francis Wire Works has a lot of obscure connectors.
www.wire-works.com Summit [or was it Jeg's?] has an HEI pigtails kit. I used a M&H harness on my '71 Jimmy. Fit perfect. Right connectors. Right lengths. Right colors. Cured several shorts and intermittents.
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Every 25 years I like to rebuild that 292, whether it needs it or not. Last edited by '68OrangeSunshine; 04-21-2009 at 09:34 PM. |
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#14 |
Registered User
Join Date: Mar 2008
Location: Oklahoma city
Posts: 490
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Re: Best wiring solution 70 Blazer
you can get hei connectors for like 2 bucks at napa as well they are pigtails so some soldering is required but easy enough.
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#15 |
Registered User
Join Date: Apr 2009
Location: Rochester, NY
Posts: 1,458
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Re: Best wiring solution 70 Blazer
I tried when I was at napa, but they don't have a part number and couldn't find it. Do you know the part number for the power and tach connectors?
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1970 Blazer 350/SM465/205 SOLD! | 1998 Z3 |
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#16 |
Senior Member
Join Date: Aug 2005
Location: OKC, OK
Posts: 2,365
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Re: Best wiring solution 70 Blazer
http://musclerodzstore.com/index.asp...ROD&ProdID=689
The American Autowire Kit in the link above is the best on the market now, bar none. Cheaper than M&H by several hundred dollars, 69-72 chevy or gmc specific unlike the painless kit for the same money. ez-kit is a bare no nothing kit that you have to make a hundred trips to the auto parts store to get all the little crap you forgot on the last trip. Start counting fuel and wasted time, the cheap price does not seam that great anymore. want hei, done, want internal reg alternator, done, want to use aftermarket guages, no problem, using vintage air, covered, modern radio, fuel injection, all are doable with what is included in the kit. Not to mention new ignition switch, headlight switch, and dimmer switch. Couple things you do need to know. If you are using factory a/c, you will have to use the Factory Fit a/c harness as the kit only provides a power source just as the original dash harness does. Wanna run the kit in a 67-68? You will have to convert to 69 and later e-brake as the new fuse box interferes with the original ebrake cable firewall pass through. You would also need to hardwire the 67-68 park lights as no provisions for them since the kit is 69-72 only.
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Mike Redpath |
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