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12 volt coil with internal resistor

Skip it46/100

a small market ($96K/yr) — 12 volt coil with internal resistor doesn't clear our bar today.

Market/yr

$96K

Growth (1y)

+237.0%

Products

24

Brands

10

was 6 a year ago

Sellers

106

Price range

$17.14–$66.84

Returns

4.3%

Rating

4.5★

46/100

Skip it

Scored 46/100 across market size, growth, competition, quality gap, and returns.

Market sizeGrowthCompetitionQuality gapReturns
Market size
5
×0.30
Growth
81
×0.30
Competition
52
×0.20
Quality gap
38
×0.10
Returns
65
×0.10

Demand

Weekly Amazon search volume, last 104 weeks — +237.0% year over year.
1K636Spike '25Prime Day '25Spike '26Jul '24Nov '24Mar '25Jul '25Nov '25Mar '26

Seasonality

Monthly demand index across the year — 1.00 is average.

Peak months: Apr, May · busiest ÷ quietest = 2.2×

Competition

41%Pertronix
  • Pertronix41%
  • Spectra Premium23%
  • Parts Player14%
  • XYZIL8%
  • CNPAPC5%
  • Standard Motor Products4%
  • Other (4 brands)5%

The top 5 products take 55% of clicks — established leaders, but buyers still shop beyond them. 10 brands and 106 sellers compete here.

Brands

10 rising

was 6 a year ago

Sellers

106

Top 5 brand share

91%

#ProductBrandPriceRatingReviewsClick shareTrend
1Spectra Premium$20.664.5★20116%rising
12Spectra Premium$21.294.4★2103%rising
13Spectra Premium$20.274.4★6532%falling

Product shelf

All 24 tracked products in this niche.

Reviews

What buyers praise and complain about, mined from review topics.

What buyers love

Quality-Overall27%

“Great product, solid quality and works as intended; very easy to install”

Advertised Vs Actual Product17%

“Worked as expected”

Size-Overall11%

“Works and fits”

Efficiency11%

“Worked perfectly”

Assembly/Installation7%

“Easy to install”

Motor Power4%

“Must work great, tractor started”

Value For Money4%

“Good price”

Strength4%

“Really felt impressive horsepower”

Fuel Efficiency3%

“Just what my 66 Chevy needed to get it running good again”

Add-Ons/Attachments3%

“It looks really nice all hooked up to my engine”

What buyers complain about

Durability39%

“Quit working after 2 months”

Functionality-Overall9%

“i did not work”

Product Condition9%

“Product looks like it had been used”

Size-Overall7%

“I hope it was just the wrong size”

Flammable5%

“It sparks”

Defective Material/Parts5%

“don't think amazon will sell defective items that are not usable”

Heating5%

“after a few cranks the coil got so hot i could not touch it”

Leak-Proof5%

“leaked allover the engine”

Quality-Overall5%

“Low Quality Studs”

Flexibility5%

“wont tighten back up”

Top return reasons

  • Functionality-Overall22%
  • Defective Material/Parts16%
  • Compatibility-Overall14%
  • Size-Overall10%
  • Product Condition6%
  • Advertised Vs Actual Product6%
  • Leak-Proof5%
  • Durability2%
  • Value For Money2%
  • Assembly/Installation2%

Data scraped July 9, 2026 · Marketplace baseline: 4.4★ avg rating · $22.71 median price · 2.2% median returns across 13,812 tracked niches.